Year : 
2001
Title : 
Chemistry
Exam : 
NECO - BECE

Paper 1 | Objectives

21 - 30 of 41 Questions

# Question Ans
21.

Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction

A. I and II only

B. I, II and III only

C. II and III only

D. II, II and IV only

E. III and IV only

A
22.

White is NOT a property of metals?

A. ductile:

B. malleable

C. conduct heat and electricity

D. have many oxidation states

E. high melting points anti boiling points

D
23.

The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to

A. Becquerel.

B. Bohr.

C. de Broglie.

D. Rutherford.

E. Thompson.

B
24.

Which compound will have the lowest boiling point?

A. CH3OH

B. CH3COOH

C. CH3CHOH

D. C4H10

E. (CH3)3CH

D
25.

The molar mass of a compound X is 56. its empirical formula is CH2. X is

A. butene.

B. butyne.

C. ethene.

D. propene.

E. propyne

Detailed Solution

\((CH_{2})x = 56\)
\((12 + 2)x = 56\)
\(14x = 56\)
\(x = \frac{56}{14}\)
\(x = 4\)
Hence, the empirical formula is \((CH_{2}) \times 4\)
= \(C_{4}H_{8}\)
26.

The Kinetic theory can NOT be used to explain

A. allotropy.

B. Brownian movement.

C. diffusion.

D. Tyndal effect.

E. vaporization.

A
27.

The best way to distinguish between Na2CO3and NaHCO2 is by.

A. adding an acid.

B. adding an alkali.

C. dissolving in water.

D. exposing to air.

E. heating.

E
28.

An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?

A. I and II

B. I and III

C. I and IV

D. II and III

E. II and IV

B
29.

Faraday s first law of electrolysis can be expressed mathematically as

A. m=I/it

B. mαit

C. Q=it

D. QαI/it

E. Qαit

B
30.

A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.

What is the 42. relative molecular mass of X.

A. 5

B. 12

C. 18

D. 45

E. 50

E
21.

Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction

A. I and II only

B. I, II and III only

C. II and III only

D. II, II and IV only

E. III and IV only

A
22.

White is NOT a property of metals?

A. ductile:

B. malleable

C. conduct heat and electricity

D. have many oxidation states

E. high melting points anti boiling points

D
23.

The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to

A. Becquerel.

B. Bohr.

C. de Broglie.

D. Rutherford.

E. Thompson.

B
24.

Which compound will have the lowest boiling point?

A. CH3OH

B. CH3COOH

C. CH3CHOH

D. C4H10

E. (CH3)3CH

D
25.

The molar mass of a compound X is 56. its empirical formula is CH2. X is

A. butene.

B. butyne.

C. ethene.

D. propene.

E. propyne

Detailed Solution

\((CH_{2})x = 56\)
\((12 + 2)x = 56\)
\(14x = 56\)
\(x = \frac{56}{14}\)
\(x = 4\)
Hence, the empirical formula is \((CH_{2}) \times 4\)
= \(C_{4}H_{8}\)
26.

The Kinetic theory can NOT be used to explain

A. allotropy.

B. Brownian movement.

C. diffusion.

D. Tyndal effect.

E. vaporization.

A
27.

The best way to distinguish between Na2CO3and NaHCO2 is by.

A. adding an acid.

B. adding an alkali.

C. dissolving in water.

D. exposing to air.

E. heating.

E
28.

An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?

A. I and II

B. I and III

C. I and IV

D. II and III

E. II and IV

B
29.

Faraday s first law of electrolysis can be expressed mathematically as

A. m=I/it

B. mαit

C. Q=it

D. QαI/it

E. Qαit

B
30.

A gas X diffuse through porous partition at the rate of 3 cm3 per second. Under the same condition hydrogen diffused at the rate of 15 cm3 per second.

What is the 42. relative molecular mass of X.

A. 5

B. 12

C. 18

D. 45

E. 50

E