A mixture of and contain 30.40 % mass per cent of nitrogen. What is the mass ratio of the two components in the mixture ?
1. 2:1
2. 1:2
3. 3:4
4. 4:1
Calculate the number of millilitres of solution (d = 0.986 g/mL) contain 2.5 % by mass NH3, which will be required to precipitate iron as in a 0.8 g sample that contains 50 %
1. 0.344 mL
2. 3.44 mL
3. 17.24 mL
4. 10.34 mL
In the preparation of iron from haematite by the reduction with carbon . How much 80 % pure iron may be produced from 120 kg of 90 % pure ?
1. 94.5 kg
2. 60.48 kg
3. 116.66 kg
4. 120 kg
A mineral consists of an equimolar mixture of the carbonates of two bivalent metals. One metal is present to the extent of 12.5 % by mass. 2.8 g of the mineral on heating lost 1.32 g of . What is the % by mass of the other metal ?
1. 87.5
2. 35.71
3. 65.11
4. 23.21
6.2 g of a sample containing and non-volatile inert impurity on gentle heating loses 5 % of its mass due to reaction . Residue if dissolved in water and formed 100 mL solution and its 10 mL portion requires 7.5 mL of 0.2 M aqueous solution of for complete precipitation of carbonates.
Determine mass (in gram) of in the original sample
1. 1.59
2. 1.06
3. 0.53
4. None of these
1 M NaOH solution was slowly added into 1000 mL of 183.75 g impure solution and the following plot was obtained. The percentage purity of sample and slope of the curve respectively are :
1. 75 %,
2. 80%,
3. 80 %, -1
4. None of these
on ignition converts into . A sample of pyrolusite having 75 % , 20 % inert impurities and rest water is ignited in air to constant mass. What is the percentage of Mn in the ignited sample ?
1. 24.6 %
2. 37 %
3. 55.24 %
4. 74.05 %
A 1.0 g sample of a pure organic compund containing chlorine is fused with to convert chlorine to NaCl. The sample is then dissolved in water, and the chlorine precipitated with giving 1.96 g of AgCl. If the molecular mass of organic compound is 147, how many chlorine atoms does each molecule contain ?
1. 1
2. 2
3. 3
4. 4
A 0.60 g sample consisting of only and is heated at 500C, converting the two salts of . The sample then weighs 0.465 g. If the sample had been heating to 900C, where the products are CaO and MgO. What would the mixtures of oxides have weighed ?
1. 0.12 g
2. 0.21 g
3. 0.252 g
4. 0.3 g
A metal M forms the sulphate . A 0.596 gram sample of the sulphate reacts with excess to give 1.220 g . What is the atomic mass of M
(Atomic mass : S = 32, Ba = 137.3)
1. 26.9
2. 69.7
3. 55.8
4. 23
(sulphuryl chloride) reacts with water to given a mixture of and HCl. What volume of 0.2 M is need to completely neutralize 25 mL of 0.2 M solution :
1. 25 mL
2. 50 mL
3. 100 mL
4. 200 mL
5 g sample contain only and . This sample is dissolved and the volume made up to 250 mL. 25 mL of this solution neutralizes 20 mL of 0.1 M . Calculate the % of in the sample.
1. 42.4
2. 57.6
3. 36.2
4. None of these
100 of a solution of an acid (Molar mass = 98) containing 29.4 g of the acid per litre were completely neutralized by 90.0 of aq. NaOH containing 20 g of NaOH per 500 . The basicity of the acid is :
1. 3
2. 2
3. 1
4. data sufficient
A 150 mL of solution of is divided into two unequal parts. I part reacts with hypo solution in acidic medium. 15 mL of 0.4 M hypo was consumed. II part was added with 100 mL of 0.3 M NaOH solution. Residual base required 10 mL of 0.3 M solution for complete neutralization. What was the initial concentration of
1. 0.08 M
2. 0.1 M
3. 0.2 M
4. None of these
The concentration of an oxalic acid solution is 'x' mol litre-1, 40 mL of this solution reacts with 16 mL of 0.05 M acidified . What iss the pH of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociates completely)
1. 1.3
2. 1.699
3. 1
4. 2