Quiz-2: Some Basic Concepts of Chemistry

Quiz

Question 1:

20 mL of methane is completely burnt using 50 mL of oxygen. The volume of the gas left after cooling to room temperature is?

80 ml
60 ml
30 ml
40 ml

Question 2:

10.If 300 mL of a gas weighs 0.368 g at STP. What is its molecular weight?

10.5 g
20.5 g
27.5 g
30 g

Question 3 :

61.An organic compound contains C — 40%, H = 13.33% and N = 46.67%. Its emperical formula is?

CH4N
C2H2N
CHN
CH2N

Question 4:

A hydrocarbon on combustion gives 0.88g of CO2 and 0.54 g of H2O, what will be the empirical formula of this hydrocarbon?

CH2
CH4
C2H3
CH3

Question 5:

If 80 g of CH4 reacts with 160 g of O2 then what amount of CO2 will be formed...

2.5 mol
2 mol
5 mol
10 mol

Question 6:

If a compound contains 5% sulphur then minimum molecular mass of this compound will be

540
340
440
640

Question 7:

How many grams of CO2 will be formed on thermal decomposition of 1.2Kg of 80% pure sample of CaCO3 ?

528 g
422.4 g
88 g
440 g

Question 8:

What will be the vapour density of a gaseous mixture containing equal masses of CH4 and SO2

16
32
64
12.8

Question 9:

If vapour density of a gaseous mixture of NO2 and N2O4 is 27, then how many moles of NO2 will be present in 1 mol of this mixture

0.17
0.83
0.30
0.50

Question 10:

How many number of sulphur atoms are present in 9.8g of H2SO4 ?

Na
0.2 Na
0.1 Na
0.3 Na

Results:

Correct answers: