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NECO Chemistry Past Questions & Answers - Page 16

76.

$^{234}_{90}Th → ^{234}_{91}Pa + X$
In the nuclear reaction above, X is

A.

$^0_1e$

B.

$^0_{-1}e$

C.

$^4_2He$

D.

$^1_0n$

E.

$^1_1p$

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

77.

When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as

A.

Brownian movement.

B.

Dialysis

C.

Diffusion

D.

Osmosis

E.

Tyndall effect

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

78.

The most efficient absorber of ultraviolet radiation in the atmosphere is

A.

CO₂

B.

H₂

C.

H₂O

D.

0₂

E.

O₃

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

79.

Chlorine atom forms Cl- by

A.

donating lone pair of electrons

B.

gaining an electron

C.

losing an electron

D.

sharing an electron

E.

sharing a lone pair of electrons.

View answer & explanation

Correct answer is B

Chlorine is a non-metal and non-metals ionize by gaining electron(s)

80.

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m⁵Nm^-2pressure becomes 300cm³ at 1.0 × 10⁵Nm^-2 pressure?

A.

Avogadro’s

B.

Boyle’s

C.

Charles’

D.

Faraday’s

E.

Graham’s

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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