Solution of Chapter 17. Model Question Paper I (Chemistry - Exemplar Book)

Model Question Paper I

1

Which of the following substance will have lowest melting point?
2

Which of the following reactions is an example of autoreduction?
3

In the titration of Mohr salt solution with KMnO4 solution, dilute H2SO4 is used to provide acidic medium. The titration gives unsatisfactory result when we use HCl in place of H2SO4. This is because.
4

The correct IUPAC name for CH2=CHCH2 NHCH3 is ______________.
5

Conductivity of an electrolylic solution depends on ___________.
6

Which of the following are correct statements?
7

Why does prolonged dialysis destabilise the colloids?
8

Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why?
9

Which forces impart crystalline nature to a polymer like nylon?
10

Name an artificial sweetener which is derivative of sucrose.
11

Explain why does conductivity of germanium crystals increases on doping with gallium.
12

Explain why NCl3 gets easily hydrolysed but NF3 does not.
13

Explain why [Fe(H2O)6]3+ has high magnetic moment value of 5.92 BM whereas magnetic moment of [Fe(CN)6]3– has value of only 1.74 BM.
14

Why can arylhalide not be prepared by reaction of phenol with HCl in the presence of ZnCl2?
15

Write the name of starting materials used for the synthesis of following polymer and identify its monomer unit.
16

How do antidepressant drugs counteract feeling of depression?
17

Components of a binary mixture of two liquids A and B were being separated by distillation. After some time separation of components stopped and composition of vapour phase became same as that of liquid phase. Both the components started coming in the distillate. Explain why this happened.
18

Identify the cathode and anode in the cell written below.

Cu | Cu2+ || Cl– | Cl2 , Pt


Write the reduction half reaction and oxidation half reaction of the cell.
19

With the help of an example explain how one can separate two sulphide ores by Froth Floatation method.
20

White phosphorus reacts with chlorine and the product gets hydrolysed in the presence of water to produce HCl. Calculate the mass of HCl obtained by the hydrolysis of the product formed by the reactions of 62 g of white phosphorus with chlorine in the presence of water.
21

A coordination compound CrCl3 .4H2O precipitates AgCl when treated with AgNO3. The molar conductance of the solution of coordination compound corresponds to a total of two ions. Write structural formula of the compound and name it.
22

Which of the following compounds would undergo SN1 reaction faster and why?
23

Ethers can be prepared by Williamson synthesis in which an alkyl halide is reacted with sodium alkoxide. Explain why di-tert-butyl ether can’t be prepared by this method.
24

Suggest a route by which the following conversion can be accomplished.
25

Three structures are given below in which two glucose units are linked. Which of these linkages between glucose units are between C1 and C4 and which linkages are between C1 and C6.Is the compound (I) reducing in nature? Explain.
26

Note : A statement of assertion followed by a statement of reason is given. Choose the correct option out of the options given below each equation.

Assertion : Molarity of a solution in liquid state changes with temperature.


Reason : The volume of a solution changes with change in temperature.
27

Note : A statement of assertion followed by a statement of reason is given. Choose the correct option out of the options given below each equation.

Assertion : p-nitrophenol is more acidic than phenol.


Reason : Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
28

How are most probable kinetic energy and the energy of activation affected with increase in temperature.

OR


Explain the difference between instantaneous rate of a reaction and average rate of a reaction.
29

Identify compounds A to E and also explain the reactions involved.


OR


A violet compound of manganese (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese are formed. Compound (C) reacts with KOH in the presence of KNO3 to give compound (B). On heating compound (C) with a mixture of conc. H2SO4 and NaCl, chlorine gas is liberated and a compound (D) of manganese along with other products is formed. Identify compounds (A) to (D) and also explain the reaction involved.
30

An alkene ‘A’ (Molecular formula C5H10) on ozonolysis gives a mixture of two compounds ‘B’ and ‘C’. Compound ‘B’ gives positive Fehling’s test and also forms iodoform on treatment with iodine and NaOH solution. Compound ‘C’, does not give Fehling’s test but forms iodoform. Identify the compounds ‘A’, ‘B’ and ‘C’ giving suitable explanation and write the reactions of ozonolysis and iodoform formation from either ‘B’ or ‘C’. (5)

OR


Explain the reactivity of a-hydrogen atoms in ethanal. Write the reaction when (a) a mixture of ethanal and benzaldehyde is treated with NaOH (aq) and (b) when only benzaldehyde is treated with conc. KOH solution. Write the names of reaction in both the cases.