The maximum number of atoms is present in which of the following -
1. 1 g of Mg(s)
2. 1 g of O2 (g)
3. 1 g of Li(s)
4. 1 g of Ag(s)
The same number of molecules as 16 g of dioxygen is present in -
(1) 16 g O
(2) 16 g SO
(3) 32 g SO
(4) All of above
The number of moles present in 2.5 litres of 0.2 M are:
1. 0.25
2. 0.5
3. 0.75
4. 0.2
Which of the following statements is correct?
1. 1 mole of electrons weights 5.4 mg
2. 1 mole of electrons weights 5.4 kg
3. 1 mole of electrons weights 0.54 mg
4. 1 mole of electrons has 1.6 C of charge
Which of the following is the odd one with regard to mass?
1. 1 g atom of sulphur
2. 0.5 moles of CO
3. 1 mole of O
4. 3 × 10 23 molecules of SO
The weight of one molecule of a compound C60H122 is
1.
2.
3.
4.
Breakfast cereal is advertised to contain 110 mg of sodium/ 100 grams of cereal. The percent of sodium in the cereal is
(1) 0.110%
(2) 0.0110 %
(3) 11.0%
(4) 0.22 %
The percentage weight of Zn in white vitriol [ZnSO4.7H2O] is approximately equal to (Zn=65, S=32, O=16 and H=1)
1. 21.56%
2. 32.58%
3. 22.65%
4. 26.55%
A gaseous mixture contains O2 and N2 in the ratio 1:4 by weight. Then the ratio of their number of molecules in the mixture is
1. 3:32
2. 7:32
3. 1:4
4. 3:16
1cc N2O at STP contains:
1. | \({1.32 \over 224} \times10^{23}~\mathrm{electrons}\) | 2. | \({6.02 \over 22400} \times10^{23}~\mathrm{molecules}\) |
3. | \({1.8 \over 224} \times10^{22}~\mathrm{atoms}\) | 4. | All of the above |