- 1 CBSE Previous Year Question Papers Class 12 Chemistry 2014 Outside Delhi
CBSE Previous Year Question Papers Class 12 Chemistry 2014 Outside Delhi
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CBSE Previous Year Question Papers Class 12 Chemistry 2014 Outside Delhi Collection I
What is the effect of temperature on chemisorption? Reply:
Chemisorption initially will increase, then decreases as the temperature increases. The preliminary improve is because of the high power of activation and the next decrease is because of the exothermic nature of the adsorption equilibrium.
What is the position of zinc metallic in silver extraction?  Answer:
Zinc is used as a decreasing agent to recuperate silver from its cyanide complicated. It reduces Ag + to Ag and is itself oxidized to Zn2 +.
What is the alkalinity of H3PO3? 
Determine a chiral molecule from the next pair: 
Which of the following is a pure polymer? Buna-S, Proteins, PVC Household Sort
Protein is a natural polymer having an amino acid as a monomer. Query 19: Conversion of main fragrant amines to diazonium salts.
referred to as ____  Reply:
What are the products of hydrolysis of sucrose? Answer:
The products of hydrolysis of sucrose are: Glucose and Fructose
Write the construction of p-methylbenzaldehyde.
Component with a density of 2.8 g cm-Three, varieties a fcc. a unit cell with an edge size of Four × 10-8 cm. Calculate the molecular weight of the aspect. (Given NA = 6.022 × 1023 mol-1) 
- What kind of non-stoichiometric dot defect is liable for the pink shade of LiCl?
- What kind of stoichiometric bug is introduced by NaCl? 
How do you distinguish the following term pairs?
- Tetrahedral and octahedral vacuum
- Crystal lattice and unit cell
Mention the Kohlrausch Regulation ions. Why is the conductivity of the answer weakened by dilution? Answer:
It is said that the limiting mole / conductivity of an electrolyte might be expressed because the sum of the only cost of the electrolyte anion and cation.
By diluting the variety of ions per unit volume. the amount of electrolytes is decreased and therefore the conductivity is decreased.
For a chemical response R → P, modifications in concentration (R) Vs. time (s) is given as  (i)
<img src="https://thecrockettreporter.com/wp-content/uploads/2019/08/1566088348_352_cbse-previous-year-survey-papers-class-12-chemistry-2014-outside-delhi.png" alt=" CBSE Previous Year Questionnaire Class 12 Chemistry 2014 Outside Delhi Series I Q12  Evaluate the order of the reaction.
- Zero Order Reaction
- The slope of the curve is (-K). i.e. negative slope. Question 13. Explain the principle of the method of electrolytic cleaning of metals. Give one example. Answer:
In the electrolysis method, the impure metal is made an anode. The cathode used is pure strip of the same metal. They are placed in a suitable electrolytic bath containing a soluble salt of the same metal. The more basic metal will remain in solution and the less basic will go into the anode mud.
For example: Copper is processed by electrolysis, the net result of electrolysis is the transfer of pure copper from the anode
anode: Cu → Cu2 + + 2e–
Cathode: Cu2 + + 2e– → Cu
Question 14. [ ] Complete the following equations: 
- P4 + H2O →  XeF4 + O2F2 →
- P4 + H2O → H3PO4 + H2
- XeF4 + O2F2 → XeF6 + O2
- Question 15.
Draw the following structures:
(ii) BrF3  Answer:
Write the next equations for the next reactions:  (i) Reimer-Tiemann reaction
(ii) Williamson s ynthesis
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Write the next response mechanism:
Write the names of the monomers that have been used in the following polymers: 
- Phenol and formaldehyde are monomers used to type bakelite. Chloroprene is a monomer used to make neoprene.
(a) Calculate ΔrG0 for the reaction
Mg (s) + Cu2 + (aq) → Mg2 + (aq) + Cu (s)
Given: E0cell = 2.71 V, 1F = 96500 C mol-1
(b) Identify the cell sort used within the Apollo area program to generate electrical energy.  Reply:
(a) Mg (s) + Cu2 + (aq) → Mg2 + (aq) + Cu (s)
ΔrG ° = – nFE ° cell
= -2 × 96500 × 2.71
= -523.03 kj mol-1
(b) Hydrogen-oxygen gasoline cells and solar cells.
The next info was obtained in the course of the first one-time decomposition of SO2Cl2 as a continuing volume:
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
Calculate the speed constant. (Given: log 4 = Zero.6021, log 2 = Zero.3010)  Answer:
SO2Cl2 (g) → SO2 (g) + Cl2 (g)
dt1 t = Zero, P0. … 0
At t = t, P0 – P …… .. P
Complete thermal decomposition strain of SO2Cl2 time t.
Pt = (P0 – P) + P + P
Pt = P0 + P
then P = Pt – P0
P0 – P = P0 – (Pt – Po) = 2P0 – Pt
What are Emulsions? What are their differing types? Give one instance for each sort. Answer:
Emulsions are colloids by which each the dispersed part and the dispersion medium are liquid. It’s a combination of two or more liquids which are normally immiscible. There are two varieties: (19) Oil in Water-Sort Emulsions (O / W): In such emulsions, the oil is a dispersed part and the water is a dispersed medium.
for example. Milk, a risky cream. 19659006] (ii) Water in Oil Sort Emulsions (W / O): In such emulsions water is a dispersed part and the oil is a dispersed medium.
e.g., butter, cod liver oil.
Given the reasons for
(i) (CH3) Three P = O exists but (CH3) 3N = O. doesn’t exist. (Ii) Oxygen has less electron achieve enthalpy at unfavorable sign than sulfur. (19459006) (iii) H3PO2 is a stronger decreasing agent than H3PO3. Reply:
(ii) Because of the small measurement and excessive electronegativity of oxygen, sulfur has less electron achieve enthalpy compared to sulfur.
(i) Enter its IUPAC identify. complicated [Cr(NH3)4Cl2] Cl.
(ii) What sort of isomerism does [Co(en)3] 3+ indicate? (en = ethane-1,2-diamine)
(iii) Why [NiCl4] is 2-paramagnetic but [Ni(CO)4] is diamagnetic  (no: Cr = 24, Co = 27, Ni = 28)
(i) Tetramine dichlorochromium (III) chloride
(ii) Optical isomerism exhibits complicated [CO(en)3] Three+
(iii) [Ni(Cl)4] 2 -, Ni is +2 in oxidation state with digital assembly 3d84s0. Since Cl- is a weak ligand, it can’t mate an electron to a 3D orbit, subsequently [NiCl4] 2 is paramagnetic. In [Ni(CO)4]Ni is within the 0-oxidation state with the electronic configuration 3d84s2. Co is a robust ligand that causes 4s electrons to maneuver to 3d and pair with 3D electrons. Subsequently, Ni (CO) 4 is diamagnetic.
(a) Draw the construction of the most important lunar products in every of the next reactions:
(b) which halogen compound reacts quicker in the SN2 response within the following pairs:
(i) CH3Br or CH3I
(ii) (CH3) 3C-Cl or CH3-Cl
( b) (i) CH3-I reacts quicker because iodine (I) is a greater leaving group. (Ii) CH3-Cl reacts quicker because it’s a main halide and undergoes a quicker SN2 response. Query 19.
Clarify the next:
(i) Main amines (R-NH2) have a better boiling point than tertiary amines (R3N). (Ii) Aniline isn’t used within the Friedel-Crafts response. (19459005) (iii) (CH 3) 2 NH is more primary than (CH Three) 3 N in aqueous answer.  OR
Present buildings A, B, and C in the following reactions:
(i) On account of intermolecular hydrogen bonding in main amines (more H atoms are present). They’ve a high boiling point compared to tertiary amines. (19459004) (ii) Aniline does not move the Friedel-Crafts response because the aniline is primary in nature and reacts with AlCl Three to type a salt. The constructive charge of the N atom, the electrophilic substitution within the benzene ring, is deactivated.
Outline the next terms related to proteins: 
- Peptide linkage
- Main construction
- Peptide linkage is amid shaped by the -COOH group of one α-amino acid and the -NH 2 group of different α-amino acids via the loss of a water molecule. The sequence by which the varied amino acids are arranged in a linear structure with out intermediate binding is known as the primary construction of the protein. When a protein modifications in its natural type, comparable to temperature, strain, and so forth. Subsequently, the protein loses its biological activity and that is referred to as protein denaturation. protein, e.g. cheeses
In reference to World Health Day.
Dr. Satpal organized a health camp for poor fans within the close by city. After the evaluation, he was shocked to see that the majority farmers suffered from most cancers as a result of common exposure to pesticides and lots of have been diabetic. They gave them free medicine. Dr Satpal instantly informed the Nationwide Human Rights Fee (NHRC). At the NHRC's suggestion, the government decided to offer medical care, monetary help, set up super-specialized hospitals to treat and stop deadly disease in distressed villages all over India.
(i) Write the values given (a) Dr. Satpal (b) NHRC?
(ii) What varieties of analgesics are mainly used to alleviate terminal most cancers ache?
(iii) Give an instance of artificial sweeteners which may have been really helpful for diabetics.  Reply:
(ii) Narcotic analgesics similar to morphine and heroin.
(a) Define the following terms:
(i) Molarity (19459005) (ii) Molecular Elevation fixed (kb)
(b) For a solution containing 15 g of urea (molar mass = 60 g mol-1) per liter of aqueous answer has the same osmotic strain (isotonic) as the answer of glucose (molar mass = 190 g mol-1) in water. Calculate the mass of glucose current per liter of answer. [2, 3] OR
(a) What sort of deviation is indicated by a mix of ethanol and acetone? Give reasons. (B) An answer of glucose (molecular weight = 180 g mol-1) in water is labeled 10% (w / w). What can be the molarity and molarity of the solution? (Density of answer = 1.2 g ml-1)
(a) (i) The molar quantity of solute current in a single liter of answer is called its molarity. (Ii) The rise in the boiling point of a solution when one mole of the risky solvent is dissolved in a single kilogram of the risky solvent is called the molar improve fixed (Kb).
WB = mass of solute
MB = mass of solute
WA = mass of solvent
(b) For an isotonic answer
π1 = π2
C1 = C2 (similar temperature)
or n1 = n2 (similar volume)
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x = 45 g, mass of sugar per liter of answer
(a) Ethanol / acetone combination has a constructive deviation from Raoult's regulation. When acetone is added to ethanol, the acetone molecules get between the ethanol molecules and thus break a few of the hydrogen bonds and weaken the intermolecular interaction, leading to an increase in vapor strain, leading to a constructive departure from Raoult's regulation. Glucose Mass = 10g
Mass of Answer = 100g
Mass of Water = 100-10 = 90g
(a) Fill within the following equations:
(i) Cr2O72- + 2OH– →
(ii) )) MnO4 – + 4H + + 3e – →
(b) The next:
(i) Zn isn’t thought-about as a transition component. (Ii) Transition metals type a larger variety of complexes. (19459005) (iii) The E worth of the Mn3 + / Mn2 + pair is far more constructive than that of the C3 + / Cr2 + pair. [2, 3] OR
(i) Close to structural variation and chemical reactivity, write the distinction between lanthanides and actinides.
(ii) Identify a member of the lanthanide collection recognized to have +Four oxidation state (19459005) (iii) Fill within the following equation:
MnO4 – + 8H + + 5e – →
(iv) Mn3 + and Cr3 +, which is more paramagnetic, and why? (atomic numbers: Mn = 25, Cr = 24)  Reply:
(a) (i) Cr2O72- + 2OH- → 2CrO42- + H2O
(ii) MnO4- + 4H + + 3e- → MnO2 + 2H2O
(b) (i) Zinc has a 3d104s2 configuration with out odd d-orbital electrons, so it isn’t thought-about a transition component.
(ii) Transition metals have free orbits to accommodate single pairs. electrons for bond formation they usually have a excessive cost density, in order that they type complexes. (Iii) Because of the high stability of Mn2 + (because of its half-filled 3D sub-shell) than Mn3 +, Cr3 + is more secure than Cr2 +.
S.No. Actinoids Lanthanoids 1. Actinides have a stronger tendency to form complexes. Lathanoids are formless complexes. ] 2. They show more degrees of oxidation. They show fewer degrees of oxidation. 3. They are radioactive. Lanthanides except Promethium i (19659140) (ii) Cerium (Ce) is a lanthanide element known to have an oxidation state of +4. (19459005) (iii) MnO – 4 + 8H + + 5e – → Mn2 + + 4H2O
(iv) Mn3 + is more paramagnetic because it has four attenuated electrons whereas Cr3 + has only three. ) Write the products formed when CH3CHO reacts with the following reagents:
(iii) CH3CHO in the presence of dilute NaOH
(b) Enter simple chemical tests to discriminate between the following pairs of compounds:
(i) benzoic acid and phenol
(ii) propanal and propanone. [3, 2] OR
(a) Consider the following: (2, 2, 1)
(i) Cl – CH2COOH is a stronger acid than CH3COOH.
(ii) Carboxylic acids do not give reactions (19459005] (b) Write chemical equations to illustrate the following name reactions:
(i) Rosenmund reduction
(ii) Cannizzaro reaction
(c) and CH3CH2-CH2-CO-CH3, which gives the iodine test?
(a) (i) When acetaldehyde reacts with cyanohydrogen, it gives the product 2-hydroxypropanenitrile
(iii) When 2 acetaldehyde molecules react with one another in dil. NaOH, Three-hydroxybutanal is obtained. This is an aldol reaction and will proceed the response upon warming up.
(b) (i) The phenol reacts with FeCl3 to type a purple precipitate, whereas benzoic acid provides a grey precipitate.
(a) (i) Because the I-effect is the Cl atom in ClCH2COOH and the CH3-group + I effect In CH3COOH, the electron density of the OH bond in ClCH2COOH is far lower than CH3COOH. Subsequently, ClCH 2 COOH is a stronger acid than CH 3 COOH.
(ii) In carboxylic acids the carboxyl group just isn’t free because it participates in resonance
(c) CH3CH2CH2COCH3 as a result of methyl ketone provides iodoform check.
CBSE Previous Year Questionnaire Papers for Class 12 Chemistry 2014 outside Delhi Collection II
Notice: Apart from the next questions, all remaining questions are introduced in the previous group.
Why is adsorption all the time exothermic? Answer:
Adsorption, which is a surface phenomenon, leads to a lower in surface power and is thus exothermic in nature. Query 2. Identify the tactic used for the purification of nickel.
The Mond process is used to purify nickel.
Why are nitrogen oxides lowered? 
What sort of polymer is neoprene based mostly on molecular forces? Reply:  elastomer.
What are the merchandise of maltose hydrolysis? Answer:
Two molecules of α-D-glucose. Question 19: Write the construction of Four-chloropentane-2.  Reply:
Write the identify of the monomers used to acquire the next polymers: 
- ethylene glycol and terephthalic acid.
- adipic acid and hexamethylenediamine. ] Question 10.
Describe the position of 
- in SiO2 extraction of copper from a copper mat. NaCN within the flotation process. Reply:
- SiO2 (silica)) acts as a flux within the extraction of copper from a copper mat to remove iron oxide as iron silicate slag. FeO + SiO2 → FeSiO3 (Slag)
- NaCN is used as a depressant as a result of it varieties a zinc complicated on the floor of Na2 [Zn(CN)4] ZnS, stopping it from forming foam.
Complete the following equations:  (i) Ag + PCl5
(ii) CaF2 + H2SO4
(ii) CaF2 + H2SO4 → CaSO4 + 2HF  Question 12. [See
Draw the buildings of  (i) XeF4
(i) Write the kind of magnetism that is noticed when the magnetic second is in the other way and remove them.
(ii) Which stoichiometric failure doesn’t change crystal density? 
Define the following terms: 
- Gasoline cell
- Limitation of molecular conductivity (∧m °)
- A gasoline cell is a device that converts chemical power into gasoline into electrical power by way of a chemical reaction. The molar conductivity of an electrolyte at infinite dilution or when the concentration approaches zero known as limiting the molar conductivity. It’s expressed as °m °
Outline the next phrases:  (i) glycosidic hyperlink
(ii) invert sugar
(i) The coupling between two monosaccharide models by means of an oxygen atom is called a glycosidic bond. (19659006) (ii) Sucrose known as invert sugar as a result of it produces equimolar quantities of glucose and fructose in hydrolysis to provide an equimolar mixture of D. – (+) – glucose and D – (-) – fructose, which is reversible. This alteration within the particular rotation step from the dextror to the flat rotation known as the inversion of the sugar and the ensuing mixture is known as the invert sugar. (19659006) (iii) A carbohydrate which upon hydrolysis yields two to ten monosaccharide molecules is known as an oligosaccharide, e.g. sucrose.
CBSE Previous Year Questionnaire Papers for Class 12 Chemistry 2014 outside Delhi Collection III
Observe: Apart from the following questions, all remaining questions have been requested in previous collection. Query 1.
What are the dispersed part and dispersion medium in milk? Reply:
The dispersed part is an oil or fats and the dispersion medium is water. Query 19. Identify the tactic used to purify the copper metallic.
Why does NH3 function the idea for Lewis? Reply:
Because the NH3 pair of nitrogen has a lone pair, it may well release its lone electron pair and type coordinate bonds with Lewis acids and acts as the Lewis base.
Which of the next is fiber?  nylon, neoprene, PVC
Write down the merchandise of hydrolysis of lactose.  Reply:
Write Construction of 2-hydroxybenzoic acid.  Answer:
Complete the following equations: 
- Cu + 2H2SO4 (cone.) →
- XeF2 + H2O →
- Cu + colour. 2H2SO4 → CuSO4 + SO2 + 2H2O
- 2XeF2 + 2H2O → 2Xe + 4HF + O2
Draw the following structure:  (i) XeO3
(ii) H2SO4  :
Enter a name to obtain the following polymers of the monomers used: 
- 1,Three-butadiene and acrylonitrile
(i) Write detectable sort when the magnetic second is utilized in parallel and anti-parallel instructions in uneven numbers.  (ii) What stoichiometric defect reduces crystal density? Question 19.
Outline the following terms:
- Molecular Conductivity (∧m)
- Secondary Batteries 
Answer:  Molecular conductivity refers back to the conductivity of all ions produced by dissolving one mole of electrolyte.
- Secondary batteries are those batteries that may be recharged by passing electrical energy via them and may so reuse for example lead battery.
Write the principle of the foam-buoyancy course of. What is the position of collectors in this process? Answer:
A flotation process has been used to take away Gang from the sulfide ore. In this process, a slurry of ore is prepared with water.
Collectors (e.g. tall oil, fatty acids, and so forth.) improve the wettability of the mineral particles and are used to grease the froth from the floor. Question 19.
Define the following terms:  (i) nucleotide
(iii) important amino acids
(i) Nucleotide incorporates all nucleic acids three primary elements, i.e. pentose sugar, nitrogenous base and phosphoric acid. When the nucleoside is coupled to the phosphorus addition at the 5 & apos; place of the sugar group, the nucleotide is obtained. (19659006) (ii) A carbohydrate that differs in configuration from a glycoside carbon (i.e., C1 in aldoses and C2 in ketoses) known as a nucleotide. anomers. for instance. α-D – (+) glucose and β-D – (+) glucose.
(iii) Essential amino acids are amino acids that can’t be synthesized by the body and have to be ingested via food regimen. for instance. Instrument.
Previous year CBSE survey papers
- in SiO2 extraction of copper from a copper mat. NaCN within the flotation process. Reply: