Chemistry Test 70

Result

Chemistry Test 70

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Weekly Quiz Competition

Question 1
4 / -1

Equal masses of H₂,O₂ and methane have been taken in a container of volume V at temperature 27^∘C under identical conditions. The ratio of the volumes of gases H₂,O₂ and CH₂ would be

A
8 : 16 : 1

B
16 : 8 : 1

C
16 : 1 : 2

D
8 : 1 : 2

Solution
Question 2
4 / -1

At temperature 327^∘C and concentration C₁the osmotic pressure of a solution is P The same solution at concentration C/2 and temperature 427^∘C shows the osmotic pressure of 2 atm. What will be the value of P ?

A
12/7

B
24/7

C
6/5

D
5/6

Solution
Question 3
4 / -1

The standard Gibbs free energy change and enthalpy change at 25^∘C for the liquid phase reaction

J/mol. If the solution is ideal and enthalpy change is assumed to be constant, then the equilibrium constant at 95^∘C is

A
0.65

B
4.94

C
6.54

D
8.65

Solution
Question 4
4 / -1

By what factor must [H⁺] be increased to increase the reduction potential of a hydrogen electrode, having fixed pressure of hydrogen gas, by 0.0282 V?

A
2

B
3

C
4

D
5

Solution
Question 5
4 / -1

Which of the following will not show geometrical isomerism?

A
2,3-Dimethylpent-2-ene

B
3,4-Dimethylhex-3-ene

C
1-Phenylpropene

D
3-Methylpent-2-ene

Solution

The compound can show geometrical isomerism when both the valencies of double-bonded carbon are satisfied by different groups. In 2,3-Dimethylpent-2-ene both valencies of second carbon are satisfied by the methyl group. Hence it will not show geometrical isomerism.

Hence, the correct option is (A).
Question 6
4 / -1

The equivalents of H₂O₂reacted with Sn²⁺ is:

A
0.6

B
0.2

C
0.3

D
0.4

Solution
Question 7
4 / -1

In context with the industrial preparation of hydrogen from water gas (CO+H₂), which of the following is the correct statement?

A
CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ in alkali

B
CO and H₂ are fractionally separated using differences in their densities

C
CO is removed by absorption in aqueous Cu₂Cl₂ solution

D
H₂ is removed through occlusion with Pd

Solution

Thus, CO is oxidized to CO₂ with steam in presence of a catalyst followed by absorption of CO₂ in alkali.

Hence, the correct option is (A).
Question 8
4 / -1

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K⁺, Ca²⁺, Mg²⁺, Be²⁺?

A
Be²⁺ < K⁺ < Ca²⁺ < Mg²⁺

B
K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺

C
Ca²⁺ < Mg2+ < Be²⁺ < K⁺

D
Mg²⁺ < Be²⁺< K⁺ < Ca²⁺

Solution

The high charge and small size of the cations increase polarisation.

As the size of the given cations decreases as:

K⁺ > Ca²⁺ > Mg²⁺ > Be²⁺

Thus, polarising power decreases as:

K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺

Hence, the correct option is (B).
Question 9
4 / -1

The heat of combustion of carbon is −94kcal at 1 atm pressure. The intrinsic energy of CO₂ is

A
+94 kcal

B
-94 kcal

C
+47 kcal

D
-47 kcal

Solution
Question 10
4 / -1

If we have an element with atomic number 115, then which of the following statements is correct about this element?

A
It will be an s-block element.

B
It will be a p-block element

C
It will be a d-block element

D
It will be an actinide.

Solution

If we place an element with atomic number 115 in the periodic table, it will come under the 15^th group. So, it will be a p-block element.