Chemistry questions and answers

Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

1,011.

Why does the treatment of cotton fabrics with dilute acids weaken the materials?

A.

Cotton is hydrolysed completely to glucose

B.

The fabrics are soluble in dilute acids

C.

The molecular chains are partially broken

D.

The molecular chain length f the fabric increases

E.

The thread holding the fabric together Is completely destroyed.

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,012.

An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]

A.

CH3Br

B.

C2H5Br

C.

C3H5Br

D.

C3H7Br

E.

C4H9Br

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,013.

What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?

The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]

A.

3.2 g

B.

3.25 g

C.

6.4 g

D.

6.5 g

E.

64.0 g

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,014.

Which element is the most electronegative?

A.

calcium

B.

fluorine

C.

iodine

D.

oxygen

E.

sodium

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,015.

What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?

A.

A yellow precipitate of Cr(OH)3 is formed

B.

An orange precipitate of Cr(OH)3 is formed

C.

The colour changes from orange to yellow

D.

The colour changes from yellow to orange

E.

There is no visible reaction.

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.


Sub-categories

NECO


Aptitude Tests

Data Interpretation Questions and Answers

Spatial Reasoning Questions and Answers

Microsoft Office Questions and Answers

Quantitative Reasoning Questions and Answers

Verbal Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Logical Reasoning Questions and Answers

Puzzles Questions and Answers

Numerical Reasoning Questions and Answers

Typing Speed and Accuracy Test

Personality Test

Situational Judgement Questions and Answers

Nigeria General Knowledge Questions and Answers

See all →

Interview Questions & Answers
View latest jobs in Nigeria today