Chemistry Test

Question 1
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Which of the following statements is not true?

A
α-Carbon of α-amino acid is asymmetric.

B
Human body can synthesize all the proteins it needs.

C
All proteins are found in L-form.

D
At pH = 7, both amino and carboxylic groups exist in ionized form.

Question 2
4 / -1

NH₃ gas at 1 atm and HCl gas at P atm are allowed to effuse at room temperature through identical pinholes from opposite ends of a glass tube of 1 m length and uniform cross-section. NH₄Cl is first formed at a distance of 60 cm from the end, through which HCl gas is sent into the tube. What is the value of P?

A
4.83 atm

B
1.298 atm

C
1 atm

D
2 atm

Question 3
4 / -1

A colloidal phase in which gas bubbles are dispersed in a liquid phase is known as

A
foam

B
sol

C
aerosol

D
emulsion

Question 4
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Dalton's law of partial pressure is applicable to which of the following systems?

A
NH₃ + HCl

B
NO + O₂

C
H₂ + N₂

D
CO + H₂

Question 5
4 / -1

The standard Gibb's free energy of the following reaction at 25^oC is 38484 J.

PCl₅ (g) PCl₃ (g) + Cl₂ (g)

The value of equilibrium constant is

A
1.5 * 10^-7

B
0.18 * 10^-7

C
1.8 * 10^-7

D
None of these

Question 6
4 / -1

Directions: The following question has four choices out of which ONLY ONE is correct.

Which of the following statements is not correct?

A
Adsorption energy for chemical adsorption is generally greater than that for physical adsorption.

B
Physical adsorption is due to van der Waals forces.

C
Physical adsorption decreases at high temperature.

D
Physical adsorption is an irreversible reaction.

Question 7
4 / -1

Which of the following statements is incorrect?

A
A metal that crystallises in bcc structure has a coordination number 12.

B
The coordination number of each type of ion in CsCl is 8.

C
A unit cell of an ionic crystal shares some of its ions with other unit cells.

D
The length of the unit cell in NaCl is 552 pm (^rNa⁺ = 95 pm, ^rCl^- = 181 pm).

Question 8
4 / -1

If 150 kJ of energy is needed for a man to walk a distance of 1 km, then how much glucose does one have to consume to walk a distance of 5 km, provided that only 30% of energy is available for muscular work? (The enthalpy of combustion of glucose is 3000 kJ mol^-1.)

A
75 g

B
30 g

C
180 g

D
150 g

Question 9
4 / -1

Directions: The following question is based on the paragraph given below:

Chemical reactions involve interaction of atoms and molecules. A large number of atoms / molecules (approximately 6.023 ×10²³ ) are present in a few grams of any chemical compound varying with their atomic /molecular masses. To handle such large numbers conveniently, the mole concept was introduced.

This concept has implications in diverse areas such as analytical chemistry, biochemistry electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept. A 4.0 molar aqueous solution NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (Atomic mass : Na = 23, Hg = 200;1 Faraday = 96500 coulombs).

If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is

A
200

B
225

C
400

D
446

Question 10
4 / -1

Consider the following vapour pressure - mole fraction graph. SP (Total vapour pressure of the resultant solution) is equal to

A
PQ + RS

B
PQ + QR + RS

C
SR + SQ

D
PQ + QR

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Chemistry Test ...

Question 1

α-Carbon of α-amino acid is asymmetric.

Human body can synthesize all the proteins it needs.

All proteins are found in L-form.

At pH = 7, both amino and carboxylic groups exist in ionized form.

Question 2

4.83 atm

1.298 atm

1 atm

2 atm

Question 3

foam

sol

aerosol

emulsion

Question 4

NH3 + HCl

NO + O2

H2 + N2

CO + H2

Question 5

1.5 * 10-7

0.18 * 10-7

1.8 * 10-7

None of these

Question 6

Adsorption energy for chemical adsorption is generally greater than that for physical adsorption.

Physical adsorption is due to van der Waals forces.

Physical adsorption decreases at high temperature.

Physical adsorption is an irreversible reaction.

Question 7

A metal that crystallises in bcc structure has a coordination number 12.

The coordination number of each type of ion in CsCl is 8.

A unit cell of an ionic crystal shares some of its ions with other unit cells.

The length of the unit cell in NaCl is 552 pm (rNa+ = 95 pm, rCl- = 181 pm).

Question 8

75 g

30 g

180 g

150 g

Question 9

200

225

400

446

Question 10

PQ + RS

PQ + QR + RS

SR + SQ

PQ + QR

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Question Analysis

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NH₃ + HCl

NO + O₂

H₂ + N₂

CO + H₂

1.5 * 10^-7

0.18 * 10^-7

1.8 * 10^-7

The length of the unit cell in NaCl is 552 pm (^rNa⁺ = 95 pm, ^rCl^- = 181 pm).