Jamb Chemistry 2017 Past Questions and Answers

Question 21:

• JAMB 2017

When ΔH is negative, a reaction is said to be

A. Endothermic
B. Exothermic
C. Reversible
D. Ionic

Question 22:

• JAMB 2017

\(^{226}_{88}Ra\) → \(^x_{86}Rn\) + alpha particle

A. 226
B. 220
C. 227
D. 222

Question 23:

• JAMB 2017

The shape of ammonia molecules is

A. Trigonal planar
B. Octahedral
C. Square planar
D. Tetrahedral

Question 24:

• JAMB 2017

The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is — (Ag = 108 F = 96500(mol-1)

A. 54.0g
B. 27.0g
C. 13.5g
D. 108.0g

Question 25:

• JAMB 2017

Tin is unaffected by air at ordinary temperature due to its

A. Low melting point
B. Weak electropositive character
C. High boiling point
D. White lustrous appearance