Home / Aptitude Tests / Chemistry / If 20 cm3 of distill...
If 20 cm3 of distilled water is added to 80 cm

If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to

A.

20 mol dm-3

B.

0.40 mol dm-3

C.

2.00 mol dm-3

D.

5.00 mol dm -3

View answer & explanation

Correct answer is B

From M1V1 = M 2
V2; m 1 = 0.50 mol dm-3; m2 = ?; v1 = 80cm 3 = 100cm3
:. m2 = m1v2/v2 = 0.50 x 80/100 = 0.40 mol dm-3

See all Chemistry questions & answers
See more WAEC questions & answers
Similar Questions

Transition metals possess variable oxidation states because they have ...

The gas used in the manufacture of vanaspati from vegetable oil is ...

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. The empirical formula ...

Leads is used for making bullets and lead shots because of its ...

A trihydric alkanol is ...

The bond which joins two ethanoic acid molecules in the liquid state is...

Which of the following features of a human skeleton can be determined by carbon-dating? ...

Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, ...

The air pollutant unknown in nature is...

How many atoms are there in one mole of hydrogen gas? [Avogadro's constant = 6.02 x 1023mol-1] ...

Aptitude Tests

Numerical Reasoning Questions and Answers

Personality Test

Logical Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Spatial Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Typing Speed and Accuracy Test

Situational Judgement Questions and Answers

Nigeria General Knowledge Questions and Answers

Verbal Reasoning Questions and Answers

Microsoft Office Questions and Answers

Puzzles Questions and Answers

Data Interpretation Questions and Answers

See all →