Chemistry Test 276

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Chemistry Test 276

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Weekly Quiz Competition

Question 1
4 / -1

For the following cell with hydrogen electrodes at two different pressure p₁and p₂emf is given by

A

B

C

D

Solution

This is the type of the cell in which electrodes at different pressures are dipped in same electrolyte and connectivity is made by a salt-bridge.
Question 2
4 / -1

A
100

B
10

C
0.01

D
0.1

Solution

This is a type of concentration cell using hydrogen electrode as anode and cathode.
Question 3
4 / -1

The correct order of thermal stability of the hydrides of group 16 elements is

A
H₂Po> H₂Fe> H₂Se> H₂S > H₂O

B
H₂O<H₂S>H₂Se>H₂Te>H₂Po

C
H₂O=H₂S=H₂Se-H₂Te=H₂Po

D
H₂O>H₂S>H₂Se>H₂Te>H₂Po

Solution

Thermal stability ∝ bond dissociation energy

(where, E = group 16 elements)

On moving down the group, bond dissociation energy decreases due to increase in bond length. Thus, the order of bond dissociation energy or thermal stability is

H₂O > H₂S > H₂Se > H₂Te > H₂PO
Question 4
4 / -1

Which of the following statements regarding ozone are correct?

A
O—O bonds in ozone have considerable double bond character

B
Pure ozone is pale blue gas and dark blue liquid

C
Nitric oxide and freons are responsible for the depletion of ozone layer

D
All are correct

Solution

Ozone is thermodynamically unstable w.r.t oxygen since, its decomposition into oxygen results in liberation of heat.
Question 5
4 / -1

The solubility of CO₂ in water increases with

A
Increase in temperature

B
Reduction in gas pressure

C
Increase in gas pressure

D
Increase in volume

Solution

This is in accordance with Henry's law.

'At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to partial pressure of that gas in equilibrium with that liquid.'
Question 6
4 / -1

An ideal solution is formed when its components'

A
Heat of mixing is greater than 1

B
Volume of mixing is only zero

C
Solute-solvent interactions are different from solute-solute and solvent-solvent interactions

D
Solute-solvent interactions are greater than solute-solute and solvent-solvent interactions

Solution

For ideal conditions, mixing of heat and mixing of volume must be zero and there should be no interaction between the solute-solvent, solvent-solution, solvent-solvent, etc.
Question 7
4 / -1

Which of the following has the highest boiling point?

A
0.1 N Na₂SO₄

B
0.1 N MgSO₄

C
0.1 M Al₂(SO₄)₃

D
0.1 M BaSO₄

Solution

As Al₂(SO₄)₃ has maximum ions, so it has the highest boiling point.
Question 8
4 / -1

3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?

A
80 torr

B
140 torr

C
72 torr

D
70 torr

Solution
Question 9
4 / -1

A
X = p₁ + p₂, Y = 1, Z = 0

B
X = p₁ + p₂, Y = 0, Z = 0

C
X = p₁ × p₂, Y = 0, Z = 0

D
X = p₁ − p₂, Y = 1, Z = 0

Solution

Here, X = P_T = p₁+ p₂ = Total pressure of the solution.

p₁ and p₂ is the partial pressure of component 1 and 2 respectively.

Y = x₂ = mole fraction of component 2 in the liquid phase.

Z = y₂= mole fraction of component 2 in the vapour phase.

When mole fraction of component 2 in the liquid phase is 0 then mole fraction of component 2 in the vapour phase is also 0 which means the liquid is pure of component 1 only.
Question 10
4 / -1

A cell converts:

A
Electrical energy into chemical energy.

B
Chemical energy into electrical energy.

C
Magnetic energy into electrical energy.

D
Electrical energy into mechanical energy.
Solution
A cell converts chemical energy into electrical energy.
- It consists of two solid electrodes and this solid electrodes are placed in an electrolyte and connected together by an electrical conductor such as wire.
- The two electrodes should be made up of two different metals and the electrolyte solution can be an alkaline, acidic or salt solution depending on the situation.
- These electrodes can be depicted as two half cells set up in different containers and are connected through a porous or salt solution.