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$\times {10}^{-19}$ 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${}_2$ 

3. 1 mole of O${}_2$ 

4. 3 × 10 ²³ molecules of SO${}_2$

The weight of one molecule of a compound C₆₀H₁₂₂ is

1. $5.005\times {10}^{23 }\mathrm{g}$

2. $6.023\times {10}^{23} \mathrm{g}$

3. $4.1\times {10}^{-21} \mathrm{g}$

4. $1.4\times {10}^{-21}\mathrm{g}$

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: 

A 5 molar solution of H₂SO₄ is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be -

1. 0.5 N

2. 1.0 N

3. 2.5 N

4. 5 N

If 0.50 mole of BaCl₂ is mixed with 0.20 mole of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is -

1. 0.10

2. 0.20

3. 0.30

4. 0.40

lf equal moles of water and urea are taken in a vessel,The mass percentage of urea in the solution will be -

1. 22.086

2. 11.536

3. 46.146

4. 76.92