Chemistry Test

Question 1
1 / -0

Consider the following skeleton equation:
__As₂O₃ + __SnCl₂+ __HCl → __SnCl₄ + __As + __H₂O
What are the stoichiometric coefficients of As₂O₃, SnCl₂, HCl, SnCl₄, As and H₂O, when the above equation is balanced?

A
1, 6, 3, 2, 3, 3

B
3, 2, 1, 6, 1, 2

C
1, 3, 6, 3, 2, 3

D
3, 2, 3, 1, 2, 6

Question 2
1 / -0

If 10²¹ molecules are removed from 200 mg of CO₂, then the number of moles of CO₂ left will be

A
2.88*10^-3

B
1.66*10^-3

C
4,54*10^-3

D
3.341*10^-3

Question 3
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The minimum amount of iron required to produce just sufficient hydrogen (by reaction with dil. HCl) to react completely with the oxygen obtained by heating 2.45 g KClO₃ is

A
2.52 g

B
3.36 g

C
3.00 g

D
2.50 g

Question 4
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When a number 3.56923 *10³ is expressed in four significant figures, it becomes

A
3.5702 *10³

B
3.569 *10³

C
3.560 *10³

D
3.5692 *10³

Question 5
1 / -0

The decomposition of a certain mass of CaCO₃ gave 11.2 dm³ of CO₂ gas at STP. The mass of KOH required to completely neutralize the gas is

A
56 g

B
28 g

C
42 g

D
20 g

Question 6
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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 7
1 / -0

How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.00 g? [Atomic masses : Na = 23 u, Cl = 35.5 u]

A
5.14 *10²¹

B
2.57 * 10²¹

C
1.28 * 10²¹

D
1.71 *10²¹

Question 8
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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 9
1 / -0

The gases which diffuse at the same rate under the same temperature and pressure conditions are

A
CO and NO

B
NO₂ and CO₂

C
NH₃ and PH₃

D
NO and C₂H₆

Question 10
1 / -0

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 11
1 / -0

For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), H is equal to

A
ΔE + 2RT

B
ΔE - 2RT

C
ΔE + RT

D
ΔE - RT

Question 12
1 / -0

Which of the following pairs has the highest heat of neutralisation?

A
NH₄OH and CH₃COOH

B
NH₄OH and HCl

C
KOH and CH₃COOH

D
KOH and HCl

Question 13
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Directions: In the following question, a statement of Assertion is given; followed by a corresponding statement of Reason just below it. Of the statement mark the correct answer as:
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) If assertion is true statement, but reason is false.
(d) If both assertion and reason are false.
Assertion: Molar entropy of vaporisation of water is different from ethanol.
Reason: Water is more polar than ethanol.

A
(a)

B
(b)

C
(c)

D
(d)

Question 14
1 / -0

Standard enthalpies of formation of CO₂ (g), CO (g), N₂O (g) and NO₂(g) in kJ/mol are -393, -110, 81 and 34, respectively. What is the value of (in kJ) in the following reaction?
2NO₂ (g) + 3CO (g) N₂O (g) + 3CO₂(g)

A
–836

B
–1460

C
–1460

D
836

Question 15
1 / -0

In which of the following processes, maximum increase in entropy is observed?

A
Melting of ice

B
Sublimation of naphthalene

C
Condensation of water

D
Condensation of water

Submit Test

Chemistry Test ...

Question 1

1, 6, 3, 2, 3, 3

3, 2, 1, 6, 1, 2

1, 3, 6, 3, 2, 3

3, 2, 3, 1, 2, 6

Question 2

2.88*10-3

1.66*10-3

4,54*10-3

3.341*10-3

Question 3

2.52 g

3.36 g

3.00 g

2.50 g

Question 4

3.5702 *103

3.569 *103

3.560 *103

3.5692 *103

Question 5

56 g

28 g

42 g

20 g

Question 6

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 7

5.14 *1021

2.57 * 1021

1.28 * 1021

1.71 *1021

Question 8

4.83 atm

1.298 atm

1 atm

2 atm

Question 9

CO and NO

NO2 and CO2

NH3 and PH3

NO and C2H6

Question 10

NH3 + HCl

NO + O2

H2 + N2

CO + H2

Question 11

ΔE + 2RT

ΔE - 2RT

ΔE + RT

ΔE - RT

Question 12

NH4OH and CH3COOH

NH4OH and HCl

KOH and CH3COOH

KOH and HCl

Question 13

(a)

(b)

(c)

(d)

Question 14

–836

–1460

–1460

836

Question 15

Melting of ice

Sublimation of naphthalene

Condensation of water

Condensation of water

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Question Analysis

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2.88*10^-3

1.66*10^-3

4,54*10^-3

3.341*10^-3

3.5702 *10³

3.569 *10³

3.560 *10³

3.5692 *10³

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

5.14 *10²¹

2.57 * 10²¹

1.28 * 10²¹

1.71 *10²¹

NO₂ and CO₂

NH₃ and PH₃

NO and C₂H₆

NH₃ + HCl

NO + O₂

H₂ + N₂

CO + H₂

NH₄OH and CH₃COOH

NH₄OH and HCl

KOH and CH₃COOH