Chemistry Past Questions and Answers

For a general equation of the nature xP + yQ â‰ˆ mR + nS, the expression for the equilibrium constant is?

A K (p)x (Q)y
B (p)x (Q)y / (R)m (S)n
C (R)m (S)n / (p)x (Q)y
D M(R) n (S) / x(P) y (Q)

Question 752:

Which of these statements is TRUE about carbon (IV) oxide?

A It supports combustion
B It is strongly acidic in water
C It is very soluble in water
D It supports the buring of magnesium to produce magnesium oxide

Question 753:

Which of the following combination of gases is used for metal welding? i. Oxygen and ethyne, ii. Hydrogen and ethyne, iii. Hydrogen and oxygen, iv. Ethyne, hydrogen and oxygen.

A I and ii
B Ii and iv
C I and iii
D Ii and iv

Question 754:

Which of the following oxides of nitrogen is unstable in air?

A NO2
B NO
C N2O4
D N2O5-

Question 755:

The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?

A Hydrogen
B Nitrogen (IV) oxide
C Oxygen
D Ammonium