1211. Branch of chemistry deals with quantities of matter involves a chemical reaction is :

A. Analytical chemistry
B. Chemical chemistry
C. Organic chemistry
D. Stoichiometry *

1212. Mass of one gram molecule of oxygen gas is :

A. 16 g
B. 32 g *
C. 5 g
D. 48 g

1213. A mole of any substance is related to :

A. Number of particles
B. Volume of gaseous substances
C. Mass of a substance
D. All of these *

1214. What is mass of 0.5 moles of O3 molecules ?

A. 16 G
B. 22 G
C. 40 G
D. 24 G *

1215. Mass of one molecule of 02 is :

A. 32 G
B. 16 G
C. 32/ NA g *
D. 32 * NA g

1216. In 4.4 of Co2, the number of oxygen atoms is:

A. NA
B. NA/10
C. 2 NA
D. NA/5 *

1217. Volume occupied by 4 G of O2 at STP is :

A. 11.2 L
B. 5.6 L *
C. 2.8 L
D. 1.4 L

1218. Maximum number of molecules are present in :

A. 15 L of H2 gas at the STP;
B. 5 L of nitrogen gas at the STP
C. 2.5 G of H2 Gas *
D. 5 G of O2 Gas

1219. The incorrect statement of 2.8 g of CO is :

A: It occupies 2.24 L of volume at NTP *
B. It corresponds to 0.1 mol of CO
C. It contains same moles as in 2.8 g of N2
D. It corresponds to 6.023 * 10 molecules of O2

1220. 7.5 G of a gas occupies 5.6 L at stp . The gas is :

A. CO
B. CO2
C. NO
D. NO2 *