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WAEC Chemistry Past Questions & Answers - Page 78

386.

Which of the following sources of energy contributes to green-house effect?

Natural gas

Nuclear

Wind

Solar

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

387.

Consider the following reaction equation
C₂H_4(g) + 3O_2(g) $\to$ 2CO_2(g) + 2H₂O_(l).

The volume of oxygen at s.t.p that will be required to burn 14g of ethene is
[C₂H₄ = 28; Molar volume of gas at s.t.p = 22.4dm³

64.2dm³

33.6dm³

11.2dm³

3.73dm³

View answer & explanation

Correct answer is B

C₂H_4(g) + 3O_2(g) $\to$ 2CO_2(g) + 2H₂O_(l)

1 mole of ethene required 3 moles of O₂
28g of ethene required 3 x 22.4dm³ of O₂

14g will require $\frac{14 \times 3 \times 22.4dm^3}{28}$

= 33.6dm³

388.

Which of the following compounds is/are secondary alkanols?

i) CH₃CH(CH₃)CH₃OH
ii) CH₃CH₂CH(OH)CH₃
iii) CH₃C(OH)(CH₃)CH₃

I only

II only

I and III only

II and III only

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

389.

Ripening of fruits is hastened by using

Ethanol

Ethane

Ethene

Ethyne

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

390.

When a compound X is heated with concentrated tetraoxosulphate(VI)acid, it produces an alkene. X ia an

Alkane

Alkanol

Alkanoate

Alkyne

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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