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Chemistry MCQs for PPSC FPSC KKPSC BPSC SPSC NTS Test No. 60

Lecturer Chemistry MCQs / Avogadro’s Law, Chemical Equation and Stoichiometry of Chemical Reactions, Chemistry and its Importance, chemistry MCQs, Chemistry MCQs with answers, Equivalent Weight, Laws of Chemical Combinations, Mass, Matter, Mole Concept, Mole Fraction, Physical Quantities and their Measurements

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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 60
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

Lecturer of Chemistry Online Test No. 60

1 / 25

0.59 g of the silver salt of an organic acid (molar mass 210) on ignition gave 0.36 g of pure silver. The
basicity of the acid is:

2 / 25

The number of gram molecules of oxygen in 6.02 × 10²⁴ CO molecule‘s’ is:

10 g molecules

5 g molecules

0.5 g molecules

1 g molecules

3 / 25

A metal oxide has the formula M₂O_3. It can be reduced by hydrogen to give free metal and water. 0.1595 g of the metal oxide requires 6 mg of hydrogen for complete reduction. What is the atomic weight of metal?

46.56

58.5

55.8

54.4

4 / 25

‘X’ gram of calcium carbonate was completely burnt in air. The weight of solid residue formed is 28 g. What is the value of ‘X’ (in grams)?

150

200

100

5 / 25

The amount of Zinc (atomic weight = 65) necessary to produce 224 mL of H₂ by the reaction with an acid
will be:

6.5 g

0.65 g

7.6 g

8.5 g

6 / 25

For the formation of 3.65 g of HCl, what volume of H₂ and Cl₂ are needed at N.T.P?

1 L, 1 L

1.12 L, 2.24 L

1.12 L, 1.12 L

3.65 L, 1.83 L

7 / 25

When a mixture of Na₂CO₃ and NaHCO₃ was heated at 423 K, 112 ml of CO₂ was formed only. What is the % of Na₂CO₃ here in the mixture:

68%

32%

84%

16%

8 / 25

One mole of acidified K₂Cr₂O₇ on reaction with excess KI will liberate …… moles (s) of I₂.

9 / 25

What is the volume (in litres) of CO₂ liberated at STP, when 2.12 g of sodium carbonate (mol. wt. = 106)
is treated with excess dilute HCl?

0.448

2.12

4.26

11.2

10 / 25

A purified pepsin was subjected to amino acid analysis. The amino acid present in the smallest amount was lysine, C6H14N2O2 and the amount of lysine was found to be 0.431 g per 100 g of protein. The minimum molecular mass of protein is:

34 u

3400 u

34,000 u

3400,000 u

11 / 25

How many gram of dibasic acid (mol. wt. 200) should be present in 100 mL of the aqueous solution to give
0.1 normality?

0.5 g

20 g

1 g

1.5 g

12 / 25

How many moles are present in 2.5 litre of 0.2 M H₂SO₄?

0.75

0.5

0.25

0.2

13 / 25

If 3.02 × 10¹⁹ molecules are removed from 98 mg of H₂SO₄, then the number of moles of H₂SO₄ left are:

A). 0.1 × 10^-3

B). 5 × 10^-4

C). 1.2 × 10^-4

D). 1.5 × 10^-3

14 / 25

One mole of magnesium in the vapour state absorbed 1200 kJ mol_-1 of energy. If the first and second ionization energies of Mg are 750 and 1450 kJ mol^-1 respectively, the final composition of the mixture is:

A). 86% Mg⁺ + 14% Mg²⁺

B). 36% Mg⁺ + 64% Mg²⁺

C). 69% Mg⁺ + 31% Mg²⁺

D). 31% Mg⁺ + 69% Mg²⁺

15 / 25

Find the number of valence electrons present in 0.53 g of Na₂CO₃:

A). 3.01 × 10²³

B). 1.2046 × 10²³

C). 12.046 × 10²³

D). 6.023 × 10²³

16 / 25

Sodium bicarbonate on heating decomposes to form sodium carbonate, CO2 and water. If 0.2 moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?

0.05

0.1

0.025

0.2

17 / 25

The strength of 0.01 M Na₂CO₃ solution in terms of molality is nearly............. when the density of the solution is 1.1 g/mL.

A). 9 × 10^-3

B). 1.8 × 10^-3

C). 4.5 × 10_-3

D). 1.1 × 10^-3

18 / 25

When 3 g H₂ reacts with 29 g O₂, the amount of H₂O formed is?

9 g

27 g

18 g

36 g

19 / 25

What is the equivalent weight of KMnO4?

31.6

39.5

158

20 / 25

500 mL of NH₃ contains 6.0 × 10²³ molecules at STP. How many molecules are present in 100 mL of CO₂ at STP?

A). 6 × 10²³

B). 1.5 × 10²³

C). 1.2 × 10²³

D). None of these

21 / 25

The mass of BaCO₃ formed when excess of CO2 is passed through a solution having 0.205 mole of
Ba(OH)₂ is:

4.05 g

40.5 g

81 g

20.25 g

22 / 25

The density (in g mL^-1) of a 3.60 M sulphuric acid solution, that is, 29% H₂SO₄ (molar mass = 98 g mol^-1) by mass will be:

1.64

1.88

1.22

1.45

23 / 25

Pressure in a mixture of 4 g of O₂ and 2g of H₂ confined in a container of 1 litre capacity at 0°C is:

25.2 atm

15.4 atm

35.6 atm

48.2 atm

24 / 25

The volume of carbon dioxide gas evolved at STP by heating 7.3 g of Mg(HCO₃)₂ will be:

3240 mL

1120 mL

1100 mL

2230 mL

25 / 25

A chloride of a metal (M) has 65.5% of chlorine. 100 ml of vapour of the chloride of metal at STP weighs 0.72 g. The molecular formula of this metal chloride is:

A). MCl₃

B). MCl₄

C). M₂Cl₃

D). MCl₅

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