Chemistry Test

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Chemistry Test - 11

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Question 1
1 / -0

In case of physical adsorption, there is desorption when:

A
temperature increases

B
temperature decreases

C
pressure increases

D
concentration increases

Solution

In case of physical adsorption, there is desorption when temperature increases.
Physical adsorption is exothermic in nature. Hence, it is observed at low temperature. it involves weak van der Waals forces that break at high temperature causing desorption.
Question 2
1 / -0

Gravity separation process is used for the concentration of _____________.

A
calamine

B
haematite

C
chalcopyrites

D
bauxite

Solution

Gravity separation process is used for the concentration of haematite. Gravity method is based on the difference between the densities of the ore particle and gangue. It is used for the concentration of denser ores from the water soluble and lighter impurities (gangue). Oxide ores and carbonate ores are concentrated by this method.
Question 3
1 / -0

For a gaseous reaction 2B ⇌ A , the equilibrium constant. K_pis ____________ to/ than K_c.

A
lesser

B
greater

C
equal

D
half

Solution

\(K_{p}=K_{c}(R T)^{\Delta n}\) and
\(R T>1\)
For a reaction, \(a A+b B \rightleftharpoons c C+d D\)
\(\Delta n=(c+d)-(a+b)\)
Here, \(\Delta n=1-2=-1\)
Thus, \(K_{p}\) is less than \(K_{c}\)
Question 4
1 / -0

The hormone that helps in the conversion of glucose into glycogen is:

A
cortisone

B
bile acids

C
adrenaline

D
insulin

Solution

Insulin helps in conversion of glucose to glycogen. This process is called glycogenolysis.
Question 5
1 / -0

Select the correct statement(s).

A
Cr⁺²has d⁴ configuration and acts as a reducing agent.

B
Mn⁺³ has d⁴ configuration and acts as an oxidising agent.

C
Cr⁺² and Mn⁺³, both have d⁴ configuration and acts as an oxidising agent.

D
Both A and B are correct statements.

Solution
Question 6
1 / -0

When 1 L of CO₂ is heated with graphite, the volume of the gases collected is 1.5 L. Calculate the number of moles of CO produced at STP.

A
1/11.2

B
28/22.4

C
1/22.4

D
14/22.4

Solution

\(C O_{2}(g)+C(s) \longrightarrow 2 C O(g) ; \quad x\) is amount
\(\begin{array}{lll}1 L & 0 & 0 & \text { of } C O_{2} \text { consumed }\end{array}\)
\(2 x\)
\(\Longrightarrow(1-x)+2 x=\) Total volume \(=1.5 x\)
\(\Rightarrow x=0.5 L\)
So, amount of \(C O\) consumed \(=1 L\) \(\Longrightarrow 1\) mole of \(C O \rightarrow 22.4 L C O(g)\)
\(y \rightarrow 1 L C O\)
\(\Longrightarrow y=\frac{1}{22.4}\) moles of \(C O\)
Question 7
1 / -0

All noble gases crystalline in the ccp structure except:

A
helium

B
neon

C
argon

D
krypton

Solution

All noble gases crystallize in the ccp structure except helium which has two allotropes, one in hcp structure and the other in bcc structure.
Contrary to theoretical calculations that helium should be in the face- or body-centered cubic structure, in the entire range of pressures of this study, the measurements demonstrate that helium crystallizes in hexagonal-close-packed structure (Fig.), which is the same as that of solid hydrogen under these conditions
Question 8
1 / -0

The strongest oxidising agent is :

A
F₂

B
Cl₂

C
I₂

D
Br₂

Solution

An element which can readily accept an electron is a good oxidising agent. Halogens are good oxidising agents because they have strong tendency to accept an electron due to (i) small atomic size, (ii) high electronegativity and (iii) high electron affinity. Fluorine, being smallest, is best oxidising agent.
Question 9
1 / -0

A solution containing 8.6 g urea in 1 L was found to be isotonic with a 5% (weight/volume) solution of an organic non-volatile solute. The molecular weight of later is:

A
348.9

B
34.89

C
3489

D
861.2

Solution

For two non-electrolyte solutions, if isotonic \(C_{1}=C_{2}\). \(\therefore \frac{8.6}{60 \times 1}=\frac{5 \times 1000}{M w_{2} \times 100} \Rightarrow M w_{2}=348.9\)
Question 10
1 / -0

Which of the following compounds does not give a silver mirror with Tollen's reagent ?

A
Methanoic acid

B
Propanone

C
Methanal

D
Both A and C

Solution

Tollens' reagent is a chemical reagent most commonly used to determine whether a known carbonyl-containing compound is an aldehyde or a ketone.
Ketones are not oxidized by Tollens reagent, so the treatment of a ketone with Tollens reagent in a glass test tube does not result in a silver mirror.
Formic acid is unique amongst simple carboxylic acids since it contains a hydrogen atom instead of an alkyl group(H-COOH, all other carboxylic acid contains an alkyl group attached to C instead of hydrogen on the left side).
Thus formic acid may be regarded both as an aldehyde as well as a carboxylic acid..like aldehydes it can be easily oxidized to carbonic acid (H₂CO₃) which decomposes to give CO₂ and H₂O

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Chemistry Test - 11

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Chemistry Test - 11

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Question 1

temperature increases

temperature decreases

pressure increases

concentration increases

Solution

Question 2

calamine

haematite

chalcopyrites

bauxite

Solution

Question 3

lesser

greater

equal

half

Solution

Question 4

cortisone

bile acids

adrenaline

insulin

Solution

Question 5

Cr+2 has d4 configuration and acts as a reducing agent.

Mn+3 has d4 configuration and acts as an oxidising agent.

Cr+2 and Mn+3, both have d4 configuration and acts as an oxidising agent.

Both A and B are correct statements.

Solution

Question 6

1/11.2

28/22.4

1/22.4

14/22.4

Solution

Question 7

helium

neon

argon

krypton

Solution

Question 8

F2

Cl2

I2

Br2

Solution

Question 9

348.9

34.89

3489

861.2

Solution

Question 10

Methanoic acid

Propanone

Methanal

Both A and C

Solution

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Cr⁺²has d⁴ configuration and acts as a reducing agent.

Mn⁺³ has d⁴ configuration and acts as an oxidising agent.

Cr⁺² and Mn⁺³, both have d⁴ configuration and acts as an oxidising agent.

F₂

Cl₂

I₂

Br₂