Find the mass of precipitate formed when 50 mL of 16.9% (w/v) AgNO₃ solution is mixed with 50 mL of 5.8% (w/v) NaCl solution.

(Ag = 107.8, N = 14, O = 16, Na= 23,Cl=35.5)

1.	28 g	2.	3.5 g
3.	7 g	4.	14 g

The number of atoms in 0.1 mole of a triatomic gas is: 
(N_A=6.02 x10²³mol^-1)

A stoichiometric reaction is initiated by filling a sealed steel vessel with 10 g of hydrogen gas and 64 g of oxygen gas, followed by an ignition to trigger an explosion. Determine the total number of moles of water (\(\text{H}_2\text{O}\)) produced by this combustion reaction once the limiting reactant is completely consumed:

1. 2 moles

2. 3 moles

3. 4 moles

4. 1 mole

If the Avogadro number N_A, is changed from 6.022 x 10²³ mol^-1 to 6.022 x 10²⁰ mol^-1 this would change: 

1. The definition of mass in units of grams.

2. The mass of one mole of carbon.

3. The ratio of chemical species to each other in a balanced equation.

4. The ratio of elements to each other in a compound.

An organic substance containing C, H, and O gave the following percentage composition :

C = 40.687%, H = 5.085% and O = 54.228%. The vapour density of this organic substance is 59.

The molecular formula of the compound will be:

1. C₄H₆O₄

2. C₄H₆O₂

3. C₄H₄O₂

4. None of the above

The number of gram molecules of oxygen in 6.02 × 10²⁴ CO molecules are:

1. 10 g molecules

2. 5 g molecules

3. 1 g molecules

4. 0.5 g molecules

4.4 g of an unknown gas occupies 2.24 litres of volume at NTP. The gas may be: 

On reduction with CO, 200 kg of iron ore (Fe₂O₃) containing 20% impurities gives iron. The amount of iron produced will be-

1. 84 kg

2. 200 kg

3. 56 kg

4. 112 kg

Calculate the number of ions present in 2L of a solution of 1.6 M K₄[Fe(CN)₆]:

What is the ratio of the number of atoms in 2.2 g of CO₂ and in 1.7 g of NH₃?