Chemistry Test

Question 1
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Equivalent conductance at infinite dilution, λ⁰ of NH₄Cl, NaOH and NaCl are 128.0,217.8 and 109.9 ohm⁻¹cm2eq⁻¹ respectivley. The equivalent conductance of 0.01N NH₄OH is 9.30 ohm−1cm2eq⁻¹, then the degree of ionization of NH₄OH at this temperature would be :

A
0.04

B
0.1

C
0.39

D
0.62

Question 2
3 / -1

Aqueous solutions of HNO₃, KOH, CH₃COOH and CH₃COONa of identical concentrations are provided. The pair of solutions which forms a buffer upon mixing is

A
HNO₃ and CH₃COOH

B
KOH and CH₃COONa

C
HNO₃ and CH₃COONa

D
CH₃COOH and CH₃COONa

Question 3
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How many electrons are involved in the following redox reaction?

A
0

B
2

C
4

D
6

Question 4
3 / -1

Cadmium oxide (CdO) has NaCl type structure with density equal to 8.27 g cm⁻³. If the ionic radius of O^2- is 1.24 A˚, determine the ionic radius of Cd²⁺.

A
1.5

B
1.1

C
1.9

D
1.6

Question 5
3 / -1

Directions: The following question has four choices, out of which one or more is/are correct.

Boron hydride is an electron deficient species with an incomplete octet. It dimerises through banana bonding and exists as diborone (B₂H₆). Borax, Na₂[B4O₅(OH)₄]·8H₂O and borzine, B₃H₆N₃ are other compounds of boron.

Which of the following statements is/are correct?

A
In B₂H₆, number of 2 centre-2 electron bonds is 4 and at the most, 4 hydrogen atoms are present in the same plane.

B
In B₂H₆, bond angle H_tB H_t> Hb_BHb(t: terminal b: bridging)

C
In the structure of anion of borax, the number of B-O-B units is 5.

D
All of the above

Question 6
3 / -1

Which of the following can cause liver cancer?

A
CHCl₃

B
CCl₄

C
CH₂Cl₂

D
C₁₄H₉Cl₅

Question 7
3 / -1

Which of the following gives the maximum number of isomers ?

A
[Co(NH₃)4Cl₂]

B
[Ni(en)(NH₃)4]²⁺

C
[Ni(C₂O₄)(en)₂]

D
[Cr(SCN)₂(NH₃)4]⁺

Question 8
3 / -1

Directions: The following question has four choices, out of which one or more is/are correct.

Consider the following equilibrium.

\(\mathrm{SO}_{3}(\mathrm{g}) \rightleftharpoons \mathrm{SO}_{2}(\mathrm{g})++\frac{1}{2} \mathrm{O}_{2}(\mathrm{g})\)

8 g of SO₃ is kept in a container at 527^oC. The equilibrium pressure and density are 1.6 atm and 1.6 gL^-1 , respectively.

(R = 0.08 L. atm/mol. K)

With reference to the given data, which of the following facts about the reaction is/are true?

A
The value of Kr is 0.5 atm^1/2.

B
The value of Kr is 0.253 atm^1/20.

C
At equilibrium, Q = K_eq and ΔG = (-) ve.

D
None of these

Question 9
3 / -1

Match the following.

A
A-i; B-ii; C-iii; D-iv

B
A-ii; B-i; C-iii; D-iv

C
A-ii; B-iii; C-iv; D-i

D
A-iv; B-iii; C-i; D-ii

Question 10
3 / -1

Directions: The following question has four choices, out of which one or more is/are correct.

The cation precipitated by ammonium chloride and aqueous ammonia is-

A
Bi⁺³

B
Pb⁺²

C
Fe⁺³

D
All of the above

Question 11
3 / -1

Directions: The following question has four choices, out of which one or more is/are correct.
Which of the following statements is incorrect?

A
The substitution of hydroxyl group by a halogen group in alcohol is an electrophilic substitution reaction.

B
Alcohols are weak acids as well as weak bases.

C
A secondary alcohol, on oxidation, gives a carboxylic acid containing the lesser number of carbon atoms.

D
A primary alcohol, on oxidation, gives a carboxylic acid containing the same number of carbon atoms.

Question 12
3 / -1

The heat of neutralisation of a strong acid and a strong alkali is \(57.0 \mathrm{kJmol}^{-1}\). The heat released when 0.5 mole of \(H N O_{3}\) solution is mixed with 0.2 mole of \(\mathrm{KOH}\) is :

A
57.0kJ

B
11.4 kJ

C
28.5 kJ

D
34.9 kJ

Question 13
3 / -1

Which of the following has an ester linkage?

A
Nylon-6,6

B
Dacron

C
PVC

D
Bakelite

Question 14
3 / -1

Which of the following is useful as a food preservative ?

A
Sucrolose

B
Salts of sorbic acid

C
Ascorbic acid

D
Citric acid

Question 15
3 / -1

Select the correct I.U.P.A.C name for [Cu(NH₃)₄] [PtCl₄] :

A
Tetraamminecopper (II) tetrachloridoplatinum (II)

B
Tetraamminecopper (II) tetrachloridoplatinum (IV)

C
Tetraamminecopper(II) tetrachloridoplatinate (II)

D
Tetraamminecuprate(II) tetrachloridoplatinate (II)

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Chemistry Test ...

Question 1

0.04

0.1

0.39

0.62

Question 2

HNO3 and CH3COOH

KOH and CH3COONa

HNO3 and CH3COONa

CH3COOH and CH3COONa

Question 3

0

2

4

6

Question 4

1.5

1.1

1.9

1.6

Question 5

In B2H6, number of 2 centre-2 electron bonds is 4 and at the most, 4 hydrogen atoms are present in the same plane.

In B2H6, bond angle HtB Ht> HbBHb(t: terminal b: bridging)

In the structure of anion of borax, the number of B-O-B units is 5.

All of the above

Question 6

CHCl3

CCl4

CH2Cl2

C14H9Cl5

Question 7

[Co(NH3)4Cl2]

[Ni(en)(NH3)4]2+

[Ni(C2O4)(en)2]

[Cr(SCN)2(NH3)4]+

Question 8

The value of Kr is 0.5 atm1/2.

The value of Kr is 0.253 atm1/20.

At equilibrium, Q = Keq and ΔG = (-) ve.

None of these

Question 9

A-i; B-ii; C-iii; D-iv

A-ii; B-i; C-iii; D-iv

A-ii; B-iii; C-iv; D-i

A-iv; B-iii; C-i; D-ii

Question 10

Bi+3

Pb+2

Fe+3

All of the above

Question 11

The substitution of hydroxyl group by a halogen group in alcohol is an electrophilic substitution reaction.

Alcohols are weak acids as well as weak bases.

A secondary alcohol, on oxidation, gives a carboxylic acid containing the lesser number of carbon atoms.

A primary alcohol, on oxidation, gives a carboxylic acid containing the same number of carbon atoms.

Question 12

57.0kJ

11.4 kJ

28.5 kJ

34.9 kJ

Question 13

Nylon-6,6

Dacron

PVC

Bakelite

Question 14

Sucrolose

Salts of sorbic acid

Ascorbic acid

Citric acid

Question 15

Tetraamminecopper (II) tetrachloridoplatinum (II)

Tetraamminecopper (II) tetrachloridoplatinum (IV)

Tetraamminecopper(II) tetrachloridoplatinate (II)

Tetraamminecuprate(II) tetrachloridoplatinate (II)

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Question Analysis

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HNO₃ and CH₃COOH

KOH and CH₃COONa

HNO₃ and CH₃COONa

CH₃COOH and CH₃COONa

In B₂H₆, number of 2 centre-2 electron bonds is 4 and at the most, 4 hydrogen atoms are present in the same plane.

In B₂H₆, bond angle H_tB H_t> Hb_BHb(t: terminal b: bridging)

CHCl₃

CCl₄

CH₂Cl₂

C₁₄H₉Cl₅

[Co(NH₃)4Cl₂]

[Ni(en)(NH₃)4]²⁺

[Ni(C₂O₄)(en)₂]

[Cr(SCN)₂(NH₃)4]⁺

The value of Kr is 0.5 atm^1/2.

The value of Kr is 0.253 atm^1/20.

At equilibrium, Q = K_eq and ΔG = (-) ve.

Bi⁺³

Pb⁺²

Fe⁺³