If 4 g of NaOH dissolves in 36 g of H₂O, the molarity of the solution is: (specific gravity of solution is 1 g mL^-1) : 

1.	3 M	2.	3.5 M
3.	2.5 M	4.	2 M

The mass of ammonia produced when 2.00 × 10³ g dinitrogen reacts with 1.00 ×10³ g of dihydrogen is: 

On complete decomposition, the volume of CO₂ released at STP on heating 9.85 g of BaCO₃ (atomic mass, Ba=137) will be: 

1. 1.12 L

2. 4.84 L

3. 2.12 L

4. 2.06 L

The amount of Zinc (atomic weight=65) necessary to produce 224 mL of H₂ (at STP) by the reaction with dilute sulphuric acid will be: 

ln the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\)
the number of significant figures after solving the expression is:

lf N_A is Avogadro's number, then the number of valence electrons in 4.2 g of nitride ions (N${}^{3-}$) will be:

The weight of 1x10²³ molecules of CuSO₄.5H₂O is: 

1. 34.42 g

2. 41.42 g

3. 54.44 g

4. 68.94 g

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

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. $6.023\times {10}^{23}$

1cc N₂O at STP contains: