Quiz-4: Some Basic Concepts of Chemistry (Adv Level )

 

Quiz

Question 1:

A sample of CaCO3 and MgCO3 weighed 2.21 gm is ignited to constant weight of 1.152 gm. What is the composition of the mixture. Also calculate the volume of CO2 evolved at 0°C and 76 cm of pressure.?

539.8 ml
439.8 ml
339.8 ml
239.8 ml

Question 2:

0.05 gm of commercial sample of KClO3 on decomposition liberated just sufficient oxygen for complete oxidation of 20 ml CO at 27°C and 750 mm pressure. Calculate % of KClO3 in sample

55.4%
22.5%
65.4%
20%

Question 3 :

0.5 gm of fuming H2SO4 oleum is diluted with water.This solution is completely neutralised by 26.7 ml of 0.4 N NaOH. The percentage of free SO3 in the sample is

20.6%
40.6%
30.6%
10.6%

Question 4:

34 gm of hydrogen peroxide is present in 1120 ml of solution. This solution will be called

20 volume
10 volume
30 volume
50 volume

Question 5:

The volume of 0.25 M H3PO3 required to neutralise 25 ml of 0.03 M Ca(OH)2 is

3ml
2 ml
1 ml
4 ml

Question 6:

Density of water at room temperature is 1g/ml. How many molecules are there in a drop of water, if its volume is 0.05 ml.

2.67x10^21
3.67x10^21
4.67x10^21
1.67x10^21

Question 7:

How many molecule are present in 12 L of liquid CCl4? The density of the liquid is 1.59 g cm–3

744x10^26
0.744x10^26
7.44x10^26
74.4x10^26

Question 8:

13.4g of a sample of unstable hydrated salt: Na2SO4nH2O was found to contain 6.3g of water. Determine the number of water of crystallisation.

7
6
4
5

Question 9:

A sample of oleum is labelled 109%. The % of free SO3 in the sample is

10%
40%
80%
60%

Question 10:

0.5 mol of H2SO4 is mixed with 0.2 mole of Ca(OH)2. The maximum number of mole of CaSO4 formed is

0.05
0.1
0.5
0.2

Results:

Correct answers: