Chemistry Test 190

Result

Chemistry Test 190

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Weekly Quiz Competition

Question 1
4 / -1

A very thin copper plate is electro-plated with gold using gold chloride in HCl. The current was passed for 20 minutes and the increase in the weight of the plate was found to be 2 gram [Au = 197]. The current passed was

A
0.816 amp

B
1.632 amp

C
2.448 amp

D
3.264 amp

Solution
Question 2
4 / -1

A current is passed through two voltameters connected in series. The first voltameter contains XSO₄ (aq.) and second has Y₂SO₄ (aq.) the relative atomic masses of X and Y are in the ratio of 2 : 1. The ratio of the mass of X liberated to the mass of Y liberated is :

A
1 : 1

B
1 : 2

C
2 : 1

D
None of the above

Solution
Question 3
4 / -1

Given :

(i) MnO₄^- + 8H⁺ + 5e^- → Mn²⁺ + 4H₂O E⁰ + x₁ V

(ii) MnO₂ + 4H⁺ + 2e^- → Mn²⁺ + 2H₂O E⁰ + x₂ V

Find E⁰ for the following reaction :

MnO₄^- + 4H⁺ + 3e^- → MnO₂ + 2H₂O

A

B

C

D

Solution
Question 4
4 / -1

The specific conductivity of an aqueous solution of a weak monoprotic acid is 0.00033 ohm^–1cm^–1 at a concentration 0.02 M. If at this concentration the degree of dissociation is 0.043, then calculate the value of

A
483

B
438

C
384

D
348

Solution
Question 5
4 / -1

Which of the following ions will be most effective in coagulating the As₂S₃ sol :

A
Fe³⁺

B
Ba²⁺

C
Cl^–

D

Solution

According Hardy-Schulze rule.
Question 6
4 / -1

A
The electrons will flow from B to A (in the outer circuit) when connections are made.

B
The standard e.m.f. of the cell will be 0.56 V.

C
A will be positive electrode.

D
None of the above.

Solution

A acts as cathode and B acts as anode because reduction potential of A is more.

Anode is B ⇒ is negative electrode.

⇒ electrons flow from B to A.

⇒ e.m.f. = (1.33 – 0.77) V
Question 7
4 / -1

Directions For Questions

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What are the units of the rate constant for this reaction ?

A
S^-1

B

C

D

Solution

Order of reaction is 2 therefore unit of K is mole^-1 Ls^-1.
Question 8
4 / -1

In a gaseous phase reaction. The increase in pressure from 100 mm to 110 mm is observed in 5 minute. The rate of disappearance of A₂ in mm min^-1 is :

A
4

B
8

C
2

D
16

Solution
Question 9
4 / -1

In a certain reaction, 10% of the reactant decomposes in one hour, 20 % in two hours, 30% in three hours and so on. The dimensions of the rate constant is :

A
hour^–1

B
mole litre^–1 sec^–1

C
litre mole^–1 sec^–1

D
mole sec^–1

Solution

It is a zero order reaction therefore units of K is mol L^-1 s^-1.
Question 10
4 / -1

Which of the following is wrong :

A
Enthalpy (numerical value) of physisorption is greater than that of chemisorption.

B
Physisorption is not very specific but chomisorption is highly specific.

C
Chemisorption takes place at relatively high temperatures.

D
In physisorption generally multi–molecular layers are formed on the adsorbent.

Solution

The correct statement is : Enthalpy (numerical value) of physisorption is lower than that of chemisorption.