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NECO Chemistry Past Questions & Answers - Page 28

136.

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

View answer & explanation

Correct answer is A

$(CH_{2})x = 56$

$(12 + 2)x = 56$

$14x = 56$

$x = \frac{56}{14}$

$x = 4$

Hence, the empirical formula is $(CH_{2}) \times 4$

= $C_{4}H_{8}$

137.

Which compound will have the lowest boiling point?

A.

CH₃OH

B.

CH₃COOH

C.

CH₃CHOH

D.

C₄H₁₀

E.

(CH₃)₃CH

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

138.

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

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

139.

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

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

140.

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

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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