Chemistry Test

Question 1
1 / -0

Consider the following cell reaction,

\(\mathrm{Cd}(\mathrm{s})+\mathrm{Hg}_2 \mathrm{SO}_4(\mathrm{~s})+\frac{9}{5} \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{CdSO}_4 \cdot \frac{9}{5} \mathrm{H}_2 \mathrm{O}(\mathrm{s})+2 \mathrm{Hg}(\mathrm{l})\)

The value of \(\mathrm{E}_{\text {cell }}{ }^{\circ}\) is \(4.315 \mathrm{~V}\) at \(25^{\circ} \mathrm{C}\). If \(\Delta \mathrm{H}^{\circ}=-825.2 \mathrm{~kJ} \mathrm{~mol}^{-1}\), the standard entropy change \(\Delta \mathrm{S}^{\circ}\) in \(\mathrm{J}^{-1}\) is.... (Nearest integer) [Given, Faraday constant \(=96487 \mathrm{Cmol}^{-1}\) ]

A
15

B
25

C
35

D
45

Question 2
1 / -0

Calculate the concentration of nitric acid in moles per litre in a sample which has a density \(1.41 \mathrm{gmL}^{-1}\) and the mass per cent of nitric acid in it being \(69 \%\).

A
0.7090 M

B
0.0155 M

C
1.0421 M

D
0.1630 M

Question 3
1 / -0

The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at \(25^{\circ} \mathrm{C}\) are \(3.0 \times 10^{-4} \mathrm{~s}^{-1}, 104.4~ \mathrm{kJ~mol}^{-1}\) and \(6.0 \times 10^{14} \mathrm{~s}^{-1}\) respectively. The value of the rate constant as \(\mathrm{T} \rightarrow \infty\) is:

A
6 × 10¹⁴ s^-1

B
6 × 10¹² s^-1

C
8.105 × 10²³ s^-1

D
Infinity

Question 4
1 / -0

Which of the following reactions are disproportionation reactions?

(I) \({Cu}^{+} \rightarrow {Cu}^{2+}+{Cu}\)

(II) \(3 {MnO}_{4}^{-}+4 {H}^{+} \rightarrow 2 {MnO}_{4}+{MnO}_{2}+2 {H}_{2} {O}\)

(III) \(2 {KMnO}_{4} \rightarrow {K}_{2} {MnO}_{4}+{MnO}_{2}+{O}_{2}\)

(IV) \(2 {MnO}_{4}^{-}+3 {Mn}^{2+}+2 {H}_{2} {O} \rightarrow 5 {MnO}_{2}+4 {H}^{+}\)

A
(I), (II)

B
(I), (II), (III)

C
(II), (III), (IV)

D
(I), (IV)

Question 5
1 / -0

Which of the following has least covalent P−H bond?

A
PH₄⁺

B
P₂H₅⁺

C
P₂H₆²⁺

D
PH₃

Question 6
1 / -0

Actual flame temperature is always lower than the adiabatic flame temperature because there is:

A
No possibility of obtaining complete combustion at high temperature

B
Always a loss of heat from the flame

C
Both (A) and (B)

D
None of these

Question 7
1 / -0

The number of secondary hydrogens in \(2, 2\)-dimethyl butane is:

A
\(6\)

B
\(2\)

C
\(8\)

D
\(4\)

Question 8
1 / -0

Ammonia acts as a very good ligand but ammonium ion does not form complexes because:

A
NH₃ is a gas while NH₄⁺ is in liquid form.

B
NH₃ undergoes sp³ hybridization while NH₄⁺undergoes sp³d hybridization.

C
NH₄⁺ion does not have any lone pair of electrons.

D
NH₄⁺ion has one unpaired electron while NH₃has two unpaired electrons.

Question 9
1 / -0

What is the name of the above reaction?

A
Williamson's synthesis

B
Gatterman-Koch process

C
Etard reaction

D
Hoffmann elimination reaction

Question 10
1 / -0

What is the main factor responsible for weak acidic nature of B-F bonds in BF₃?

A
Large electronegativity of F

B
Three centered two electron bonds in BF₃

C
\(p \pi-d \pi\)back bonding

D
\(p \pi-p \pi\)back bonding

Submit Test

Chemistry Test ...

Question 1

15

25

35

45

Question 2

0.7090 M

0.0155 M

1.0421 M

0.1630 M

Question 3

6 × 1014 s-1

6 × 1012 s-1

8.105 × 1023 s-1

Infinity

Question 4

(I), (II)

(I), (II), (III)

(II), (III), (IV)

(I), (IV)

Question 5

PH4+

P2H5+

P2H62+

PH3

Question 6

No possibility of obtaining complete combustion at high temperature

Always a loss of heat from the flame

Both (A) and (B)

None of these

Question 7

\(6\)

\(2\)

\(8\)

\(4\)

Question 8

NH3 is a gas while NH4+ is in liquid form.

NH3 undergoes sp3 hybridization while NH4+undergoes sp3d hybridization.

NH4+ion does not have any lone pair of electrons.

NH4+ion has one unpaired electron while NH3has two unpaired electrons.

Question 9

Williamson's synthesis

Gatterman-Koch process

Etard reaction

Hoffmann elimination reaction

Question 10

Large electronegativity of F

Three centered two electron bonds in BF3

\(p \pi-d \pi\)back bonding

\(p \pi-p \pi\)back bonding

User

Question Analysis

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

6 × 10¹⁴ s^-1

6 × 10¹² s^-1

8.105 × 10²³ s^-1

PH₄⁺

P₂H₅⁺

P₂H₆²⁺

PH₃

NH₃ is a gas while NH₄⁺ is in liquid form.

NH₃ undergoes sp³ hybridization while NH₄⁺undergoes sp³d hybridization.

NH₄⁺ion does not have any lone pair of electrons.

NH₄⁺ion has one unpaired electron while NH₃has two unpaired electrons.

Three centered two electron bonds in BF₃