Fundamental Concepts of Chemistry MCQs

Question 1

NH3 is produced according to the following reaction: N2 (g) + 3H2 (g)→ 2NH3 (g) In an experiment, 0.25 mol of NH3 is formed when 0.5 mol of N2 is reacted with 0.5 mol of H. What is the % yield?

Accepted Answer

75%

Answer

50%

Answer

33%

Answer

25%

Question 2

Caffeine has a molecular mass of 194 g. If it contains 28.9% by mass of nitrogen, number of atoms of nitrogen in one molecule of caffeine is:

Accepted Answer

4

Answer

6

Answer

2

Answer

3

Question 3

12 g of carbon combines with 64 g of sulphur to produce CS2. 12 g of carbon also combines with 32 g of oxygen to form CO2. 10 g of sulphur combines with 10 g of oxygen to produce SO2 . This data illustrates the:

Accepted Answer

Law of reciprocal proportions

Answer

Law of multiple proportions

Answer

Law of definite proportions

Answer

Law of gaseous volume

Question 4

The weight of 350 ml of a diatomic gas at 0°C and 2 atm pressure is 1 g. The weight of one atom is (N is the Avogadro's number):

Accepted Answer

32 N

Answer

16/N

Answer

16 N

Answer

12 N

Question 5

The average molecular weight of a mixture of gas containing nitrogen and carbon dioxide is 36 g. The mixture contains 280 g of nitrogen. Therefore, the amount of CO2 present in the mixture is:

Accepted Answer

440 gm

Answer

44 gm

Answer

0.1 mole

Answer

880 gm

Question 6

When 3.0 litre solution of normality N is mixed with 5.0 litre of 4M HCl, then the resultant solution has normality 10. Find the value of N.

Accepted Answer

20

Answer

10

Answer

15

Answer

25

Question 7

A 0.1097 gm sample of As2O3 requires 26.10 ml of KMnO4 solution for its titration. The molarity of KMnO4 solution is:

Accepted Answer

0.018 M

Answer

0.02 M

Answer

0.04 M

Answer

0.3 M

Question 8

When pentane C5H12 is burned in excess of oxygen, the products of the reaction are CO2(g) and H2O (l). In the balanced equation for this combustion, C5H12(g) + O2 (g) → 5CO2(g) + 6H2O (l) the coefficient of oxygen should be:

Accepted Answer

8

Answer

16

Answer

12

Answer

11

Question 9

The parental and spiritual guidance, as well as the love of a mother, _wanting.

Accepted Answer

are

Answer

was

Answer

were

Answer

have been

Question 10

Find the error of punctuation"Certainly, answered the man; "here, bring me a blanket and a good-sized mallet."

Accepted Answer

Certainly

Answer

Man; "here

Answer

Good-sized

Answer

Mallet

Question 11

Synonym of Adamant is:

Accepted Answer

Resolute

Answer

Filmsy

Answer

Docile

Answer

Clumsy

Question 12

Find the missing number in the series: 6, 3, 3, 4.5, ?

Accepted Answer

9

Answer

5.5

Answer

7

Answer

11.5

Question 13

Statements: 1. Class A has a higher enrollment than Class B. 2. Class C has a lower enrollment than Class B. 3. Class A has a lower enrollment than Class C. If the first two statements are true, the third statement is:

Accepted Answer

False

Answer

True

Answer

Uncertain

Answer

None of these

Question 14

Statements: I. The committee appointed by the Government on the fee structure of the professional courses has drastically reduced the fees of various courses in comparison to those charged in the last year.II. The parents of aspiring students seeking admission to professional courses had launched a severe agitation protesting against the high fees charged by the professional institutes and the admission process was delayed considerably.

Accepted Answer

Statement II is the cause and statement I is its effect.

Answer

Statement I is the cause and statement II is its effect.

Answer

Both Statements I and II are independent causes.

Answer

Both Statements I and II are effects of independent causes.

Answer

Both Statements I and II are effects of some common cause.

Question 15

Statement: A recent study shows that children below five die in the cities of developing countries mainly from diarrhea and parasitic intestinal worms.Courses of Action:I. Governments of the developing countries should take adequate measures to improve the hygienic conditions in the cities.II. Children below five years in the cities of the developing countries need to be kept under periodic medical check-ups.

Accepted Answer

Both I and II follow

Answer

Only I follows

Answer

Only II follows

Answer

Either I or II follows

Question 16

The number of Hydrogen molecules required to form36g of water2H, +O,->2H ,O

Accepted Answer

1.204 x 10^24

Answer

2.408x10%

Answer

24.08x10%

Answer

6.02x10

Question 17

If N is the number of molecules of a gas in a container. The number of moles can be calculated as:

Accepted Answer

N/NA

Answer

AN+NA

Answer

NA/N

Answer

N*NA

Question 18

Number of molecules in one dm3 of water will be almost:

Accepted Answer

55.66 x 6.022 x 10^23

Answer

18 x 6.02 x 10^23

Answer

18 x 6.2 x 10^23

Answer

2 x 6.2 x 10^23

Question 19

Which of the following pair of gases possesses equal volume at STP:

Accepted Answer

0.5 mole of NO and 16 g O2

Answer

44g CO2 and 44g CO

Answer

16g O2 and 32g CH4

Answer

3.01 x 10^23 molecules of CO and 3.01 x 10^23 gram molecules of H2

Question 20

Which of the following are isoelectronic species?

Accepted Answer

F-, Ne, Na+

Answer

H+, H, H-

Answer

Li+, Na+, K+

Answer

Cl-, Br-, I-

Free Fundamental Concepts of Chemistry MCQs with Answers