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

When 0.50 moles of BaCl₂ are mixed with 0.20 moles of Na₃PO₄, what is the maximum number of moles of Ba₃(PO₄)₂ that can be formed?

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

Sodium bicarbonate on heating decomposes to form sodium carbonate, CO₂ and water. If 0.2 moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?

1. 0.1

2. 0.2

3. 0.05

4. 0.025

A purified pepsin was subjected to amino acid analysis. The amino acid present in the smallest amount was lysine, C₆H₁₄N₂O₂ and the amount of lysine was found to be 0.431g per 100 g of protein. The minimum molecular mass of protein is:

1. 34 u

2. 3400 u

3. 34,000 u

4. 3,400,000 u

The number of valence electrons present in 0.53 grams of Na₂CO₃ is:

1. $3.01\times {10}^{23}$

2. $7.22\times {10}^{22}$

3. $12.046\times {10}^{23}$

4. $6.023\times {10}^{23}$

At STP, the density of CCl₄ vapour in g/L will be closest to: 

1. 8.67

2. 6.87

3. 3.67

4. 4.26

If $3.02\times {10}^{19}$ molecules are removed from 98 mg of H₂SO₄, then the number of moles of H₂SO₄ left are -

1. $0.1\times {10}^{-3}$

2. $9.5\times {10}^{-4}$

3. $1.2\times {10}^{-4}$

4. $0.5\times {10}^{-3}$