JAMB Chemistry Past Questions & Answers - Page 280

1,396.

Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask?

A.

N2O and steam

B.

NO2 and ammonia

C.

N2O2 and NO2

D.

NO and NO2

Correct answer is A

No explanation has been provided for this answer.

1,397.

Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction?

A.

Increase in temperature will cause an increase in the equilibrium constant

B.

Increase in temperature will cause a decrease in the equilibrium constant

C.

Addition of a catalyst will cause an increase in the equilibrium constant

D.

Addition of a catalyst will cause a decrease in the equilibrium constant

Correct answer is B

No explanation has been provided for this answer.

1,398.

MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from?

A.

+7 to +2

B.

+6 to +2

C.

+5 to +2

D.

+4 to +2

Correct answer is A

No explanation has been provided for this answer.

1,399.

An anhydride is an oxide of non-mental?

A.

which will not dissolve in water

B.

whose solution in water has a pH greater than 7

C.

whose solution in water has a pH less than 7

D.

whose solution in water has a pH of 7

Correct answer is C

No explanation has been provided for this answer.

1,400.

H- + H2(I)O → H2(g) + OH-(aq). From the equation above, it can be inferred that the?

A.

reaction is a double decomposition

B.

hydride ion is a reducing agent

C.

hydride ion is an oxidizing agent

D.

reaction is neutralization

Correct answer is B

No explanation has been provided for this answer.