Chemistry Test

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Chemistry Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The spectrum of He is expected to be similar to that of

A
H

B
Na

C
He⁺

D
Li⁺

Solution

The spectrum of He is expected to be similar to that of Li⁺
Question 2
1 / -0

What will be the geometry of a molecule with dsp² or sp²d hybridisation?

A
Octahedral

B
Square planar

C
Tetrahedral

D
Trigonal bipyramidal

Solution

A molecule with dsp² or sp²d hybridisation will have a square planar geometry.
Question 3
1 / -0

Consider the ground state configuration of Cr atom (Z = 24). The total numbers of electrons with azimuthal quantum numbers l = 1 and l = 2, respectively, are

A
12 and 4

B
12 and 5

C
16 and 4

D
16 and 5

Solution

The total numbers of electrons with azimuthal quantum numbers l = 1 and l = 2, respectively, are12 and 5.
Question 4
1 / -0

Which of the following molecules/ions does not contain unpaired electrons?

A
O₂

B
$\mathrm{O}_{2}^{2-}$

C
B₂

D
$N_{2}^{*}$

Solution

The molecular electronic configuration of $O_{2}^{2-}$ is:

$\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \sigma^{*} 2 s^{2}, \sigma 2 p_{*}^{2}, \pi 2 p_{x}^{2} \approx \pi 2 p_{y}^{2}, \pi^{*} 2 p_{x}^{2} \approx \pi^{*} 2 p_{y}^{2}$

since, it has all electrons paired. Therefore, it is diamagnetic in nature.
Question 5
1 / -0

The maximum number of intermolecular hydrogen bonds in a molecule of H₂O is

A
1

B
2

C
3

D
4

Solution

Four hydrogen bonds are formed by a water molecule as shown below:
Question 6
1 / -0

Which of the following statements is incorrect?

A
The charge on an electron and that on a proton are equal and opposite.

B
The neutron has no charge.

C
The electrons and protons have the same weight.

D
The mass of a proton is nearly identical to that of a neutron.

Solution

Correct Answer : The electrons and protons have the same weight.
Question 7
1 / -0

The radius of the first Bohr's orbit for hydrogen is 0.53 $A^{0}$ . The radius of the third Bohr's orbit is

A
$4.77 \stackrel{\circ}{A}$

B
$3.18 \stackrel{\circ}{A}$

C
$1.59 \stackrel{\circ}{A}$

D
None of these

Solution

Correct Answer : (1)
Question 8
1 / -0

The bond order in $\mathrm{CO}_{3}^{2-}$ ion is

A
0

B
0.88

C
1.33

D
2

Solution

Correct Answer : 1.33
Question 9
1 / -0

Which of the following statements is/are correct regarding the reducing and oxidising properties of elements?
1. A metal $M,$ for which $E^{\circ}$ for the half reaction $M^{n+}+n e^{-} \rightarrow M$ is highly negative, will be a good reducing agent.
2. The oxidising power of the halogens decreases from chlorine to iodine.
3. The reducing power of hydrogen halides increases from hydrogen chloride to hydrogen iodide.

A
1, 2 and 3

B
1 and 2

C
1 only

D
2 and 3 only

Solution

This option is correct as Frenkel defect is present in those compounds which have low coordination number and large difference in the size of cations and anions. Hence, due to small size of Zn²⁺ ion, ZnS shows this defect.
Question 10
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

On fermentation of sugar in an enzymatic solution that is initially 0.24 M, the concentration of sugar reduces to 0.06 M in 20 hours and 0.015 M in 40 hours. Which of the following statements is correct?

A
The reaction is not of first order.

B
Half-life of the reaction is 10 hours.

C
The rate constant of the reaction is 5.9 $\times$ 10^-5s^-1.

D
Half-life remains the same if the temperature increases by 10^oC.

Solution

Correct answer : Half-life of the reaction is 10 hours.

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Chemistry Test - 13

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Chemistry Test - 13

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Question 1

H

Na

He+

Li+

Solution

Question 2

Octahedral

Square planar

Tetrahedral

Trigonal bipyramidal

Solution

Question 3

12 and 4

12 and 5

16 and 4

16 and 5

Solution

Question 4

O2

\(\mathrm{O}_{2}^{2-}\)

B2

\(N_{2}^{*}\)

Solution

Question 5

1

2

3

4

Solution

Question 6

The charge on an electron and that on a proton are equal and opposite.

The neutron has no charge.

The electrons and protons have the same weight.

The mass of a proton is nearly identical to that of a neutron.

Solution

Question 7

\(4.77 \stackrel{\circ}{A}\)

\(3.18 \stackrel{\circ}{A}\)

\(1.59 \stackrel{\circ}{A}\)

None of these

Solution

Question 8

0

0.88

1.33

2

Solution

Question 9

1, 2 and 3

1 and 2

1 only

2 and 3 only

Solution

Question 10

The reaction is not of first order.

Half-life of the reaction is 10 hours.

The rate constant of the reaction is 5.9 × 10-5 s-1.

Half-life remains the same if the temperature increases by 10oC.

Solution

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He⁺

Li⁺

O₂

B₂

The rate constant of the reaction is 5.9 $\times$ 10^-5s^-1.

Half-life remains the same if the temperature increases by 10^oC.