Chemistry : Practice Questions and Answers

One mole is oxygen

One molecule of sulphur trioxide

100 amu of uranium

44 g of carbon dioxide.

0.01 g of hydrogen

0.085 g of $NH_3$

320 mg of gaseous $SO_2$

All the the above

0.01 g of hydrogen

0.085 g of $NH_3$

320 mg of gaseous $SO_2$

All the above.

16/N

32/N

16 N

32 N (N is the Av. const.)

One mole

Two mole

Three mole

Four moles

0.5 mol

0.20 mol

0.40 mol

0.25 mol

1

0.5

5

10

15 L of $H_2$ gas at S.T.P

5 L of $N_2$ gas at S.T.P

0.5 g of $H_2$ gas

10 g of $O_2$ gas

1.8 g

18 g

3.6 g

36 g

1 litre of oxygen at S.T.P.

32 litres of oxygen at S.T.P.

22.4 litres of oxygen at S.T.P.

$6.02 \times 10^{23}$ molecules of oxygen at any temperature and pressure.

$6.02 \times 10^{23}$

$3.011 \times 10^{23}$

$0.6022 \times 10^{23}$

$60.22 \times 10^{23}$

$6.02 \times 10^{22}$

$12.04 \times 10^{22}$

$1.806 \times 10^{23}$

$31.80 \times 10^{23}$

0.20mg

0.02mg

0.55mg

1.00mg

3

12

32

44

13g

23g

1 g

1/23g

12g of C12

320g of sulphur

32g of oxygen

12.7g of iodine

the actual mass of one atom of the element

the relative mass of an atom of the element

the average relative mass of different atoms of the element

much different from the mass number of the element.

its atomicity

Reactivity.

its atomic no.

1 gm-atom

$8.431 \times 10^{23}$

$3.372 \times 10^{24}$

5.6

4

6.02 litres

6.02 mL

22.4 litres

2.24 litres