Chemistry MCQs for PPSC FPSC KKPSC BPSC SPSC NTS Test No. 57

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There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
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Test Instructions:-
Test NameLecturer Chemistry
SubjectChemistry Test 57
Test TypeMCQs
Total Questions25
Total Time20 Minutes
Total Marks100
0%

You have 20 minutes to pass to the quiz.

You have 20 minutes to pass to the quiz.


Lecturer of Chemistry Online Test No. 57

1 / 25

50 g of calcium carbonate was completely burnt in air. What is the weight (in grams) of the
residue?

2 / 25

A breakfast cereal in advertised to contain 110 mg of sodium per 100 g of the cereal. The percent of sodium in the cereal is:

3 / 25

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:

4 / 25

At STP the density of a gas (mol. wt. = 45) in g/L is:

5 / 25

Which has maximum number of oxygen atoms?

A). 1 g of O

B).1 g of O2

C).1 g of O3

D). All have same number of O-atoms

6 / 25

7.5 g of a gas occupies 5.6 litres as STP. The gas is:

A). CO

B). NO

C). CO2

D). N2O

7 / 25

Express 145.6 L of chlorine in terms of gram moles.

8 / 25

One mole of CH4 contains:

A). 4.0 g atoms of hydrogen

B). 3.0 g atom of carbon

C).6.02 × 1023 atoms of hydrogen

D).1.81 × 1023 molecules of CH4

9 / 25

1000 g calcium carbonate solution contains 10 g carbonate. The concentration of solution is:

10 / 25

The vapour density of ozone is:

11 / 25

The samples of NaCl are produced when Na combines separately with two isotopes of chlorine Cl35 and Cl37. Which law is illustrated?

12 / 25

The weight of one molecule of a compound C60H122 is:

A). 1.3 × 10-20 g

B). 5.01 × 10-21 g

C). 3.72 × 1023 g

D). 1.4 × 10-21 g

13 / 25

Which of the following is the odd one with regard to mass?

A). 1 g atom of sulphur

B). 0.5 moles of CO2

C). 1 mole of O2

D). 3 × 1023 molecules of SO2

14 / 25

Which of the following pairs of gases contain equal number of molecules?

A). CO2 and NO2

B). CO and (CN)2

C). NO and CO

D). N2O and CO2

15 / 25

Which of the following statement is correct?

A). 1 mole of electrons weighs 5.4 mg

B). 1 mole of electrons weighs 5.4 kg

C). 1 mole of electrons weighs 0.54 mg

D). 1 mole of electrons has 1.6 × 10-19 C of charge

16 / 25

Number of moles of a solute per kilogram of a solvent is called:

17 / 25

One mole of a substance present in 1 kg of solvent. The correct statement regarding above solution is:

18 / 25

The number of significant figures in 306.45 and 40440 are respectively:

19 / 25

Area of nuclear cross section is measured in ‘Barn’. It is equal to:

A). 10-28 m2

B). 10-18 m2

C). 10-8 m2

D). 10-34 m2

20 / 25

Which is the correct order of micro, nano, femto and pico here?

21 / 25

A Compound possess 8% sulphur by mass. The least molecular mass is:

22 / 25

The quantity of PV/KBT represents the:

23 / 25

The maximum number of molecules is present in:

A). 15 L of O2 gas at STP

B). 10 L of H2 gas at STP

C). 1.5 g of H2 gas

D). 5 g of CO2 gas

24 / 25

The incorrect statement for 14 g of CO is:

A). It occupies 2.24 litre at NTP

B).It corresponds to 0.5 mol of CO

C).It corresponds to same mol of CO and N2

D). It corresponds to 3.01 × 1023 molecules of CO

25 / 25

2 g of O2 at NTP occupies the volume:

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