Chemistry Test 159

Result

Chemistry Test 159

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Weekly Quiz Competition

Question 1
4 / -1

Which statement is incorrect about X ?

A
It reacts with water to give H₂

B
It reacts with N₂ to give nitrate salt

C
It combines with O₂ to form oxides

D
It can displace Cu from an aqueous solution of CuSO₄.

Solution
Question 2
4 / -1

A

B

C

D
Ph–CH₂CH₂CH₂Ph

Solution
Question 3
4 / -1

A

B

C

D

Solution

CH≡C–CH₂CH₂C≡C–CH₃ +CH₃Li
Question 4
4 / -1

Which of the following alkyl bromides undergo fastest SN₁ reaction in water ?

A
CH₃CH₂Br

B

C

D
CD₃CD₂Br

Solution

The most stable intermediate carbocation is formed from both . However (B) is less stable, and hence more reactive.
Question 5
4 / -1

Directions For Questions

NH₃(g) is sealed in a U-tube manometer of uniform area of cross-section at 80 cm of Hg, as shown

...view full instructions

After sometime, due to the dissociation of NH₃, it was observed that the air column has shrunk by 5cm. Assuming that temperature remains constant, what is the degree of dissociation of NH₃ ?

A
0.375

B
0.5

C
0.65

D
0.357

Solution

For air : P₁V₁ = P₂V₂

⇒ 80 × 25 = P₂ × 20

⇒ P₂ = 100cm for Hg

For the left column :-

P_left = P_right + 10cm of Hg

⇒ P_left = 110 cm of Hg
Question 6
4 / -1

To the dissociation reaction was added, maintaining its partial pressure constant.

A
KP increases and equilibrium shifts backwards

B
KP remains constant and the equilibrium shifts forwards

C
KP remains constant and the equilibrium remains undisturbed

D
KP remains constant and the equilibrium shifts backwards

Solution

Since O₂ is added at constant partial pressure, the total pressure decreases and the total volume increases.

2N₂O₅(g) ⇌ 4NO₂(g) + O₂(g)

Let partial pressure x y z

at initial eql be

Pressure after

adding O₂, x/a y/a z

assuming that

volume increases

to 'a' times the initial

volume
Question 7
4 / -1

1 mole of an ideal monoatomic gas occupying a volume of 20L at 1 atm undergoes single step adiabatic compression against a constant external pressure of 10 atm. The final volume of gas is -

A
20 L

B
2 L

C
10.6 L

D
9.2 L

Solution
Question 8
4 / -1

What is the solubility of CaCO₃ in 0.4M H₂CO₃ solution ? Assume H₂CO₃ to be stable in aqueous solution for the duration of the reaction and Ca(HCO₃)₂ to be completely soluble. K_sp of CaCO₃ = 10^–9M K₁, K₂ of H₂CO₃ = 10^–7 and 10^–11 respectively

A
1 g per L

B
1 mol per L

C
0.1 g per L

D
0.1 mol per L

Solution
Question 9
4 / -1

(i) Reaction is a zero order reaction

(ii) Rate constant for the reaction is 0.02 s^–1

(iii) If concentration of A is changed, then rate constant changes, but rate of reaction remains constant.

(iv) The reaction is a complex reaction

A
(i), (ii) and (iv) are correct

B
(i), (iii) and (iv) are correct

C
Only (i) and (iv) are correct

D
All statements are correct

Solution

(i) (from the graph), it is a zero order reaction.

(ii) unit of rate constant for a zero order reaction is mol L^–1s^–1

(iii) Rate constant does not depend on concentration of the reaction

(iv) Zero order reaction is always a complex reaction.
Question 10
4 / -1

Electrons in H atom get excited from the ground state to an orbit in which the wavelength of the electron is 10 times the wavelength of an electron in the ground state of He⁺. How many spectral lines are observed in the visible range when these electrons are de-excited to the ground state ?

A
10

B
15

C
4

D
3

Solution