JAMB Chemistry Past Questions & Answers - Page 46

226.

The hybridization in the compound \(CH_3 - CH_2 - C \equiv H\) is

A.

sp\(^3\) and sp

B.

sp

C.

sp\(^2\)

D.

sp\(^3\) and sp\(^2\)

Correct answer is A

The hybridization in a and b is sp\(^3\) hybridization while in c and d is sp hybridization.

227.

The electronic configuration of element Z is 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\). What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion.

A.

Z\(_3\)(SO\(_4\))\(_2\)

B.

ZSO\(_4\)

C.

Z\(_2\) SO\(_4\)

D.

Z\(_2\)(SO\(_4\))\(_3\)

Correct answer is D

Z = 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\)

\(\therefore\) We have Z\(^{3+}\) and SO\(_4 ^{2-}\)

The reaction : Z\(^{3+}\) + SO\(_4 ^{2-}\) \(\to\) Z\(_2\)(SO\(_4\))\(_3\).

228.

Which of the following could not be alkane?

A.

C\(_4\)H\(_{10}\)

B.

C\(_5\)H\(_{12}\)

C.

C\(_7\)H\(_{14}\)

D.

C\(_8\)H\(_{18}\)

Correct answer is C

No explanation has been provided for this answer.

229.

The two ions responsible for hardness in water are

A.

Ca\(^{2+}\) and / or Mg\(^{2+}\)

B.

K\(^+\) and / or Mg\(^{2+}\)

C.

Ca\(^{2+}\) and / or Li\(^+\)

D.

Ca\(^{2+}\) and / or Na\(^+\)

Correct answer is A

No explanation has been provided for this answer.

230.

What volume of 0.100M sodium trioxonitrate (V) solution contains 5g of solute.
[Na = 23, N = 14, O = 16]

A.

1.7 litres

B.

0.420 litres

C.

0.588 litres

D.

2.35 litres

Correct answer is C

No explanation has been provided for this answer.