The number of moles present in 44.8 litres CO2 at STP is (a) 3 (b) 1 (c) 2 (d) 1.5

The relation between molecular mass (M) and vapour density (D) of gaseous substance is (a) 2M=D (b) M=D2 (c) M=2.8D (d) M=2D

Volume of 22 g of CO₂ at S.T.P. is [C = 12, O = 16]: (a) 22.4 litre (b) 11.2 litre (c) 2.24 litre (d) 1.12 litre

On burning sulfur in oxygen, sulfur dioxide is produced S + O2 → SO2 For producing 2240 L of SO2 at STP (i) How many grams of sulfur and (ii) how many moles of O2 will be required? (0 = 16, S = 32) [3] OR On burning 480 g of a solid compound in 352 g of oxygen, 320 g of another solid compound and a gaseous compound are produced. If the vapour density of the gaseous compound is 32, how many moles of the gaseous compound are formed? [3]

Heating 200 g of a metallic carbonate produces 112 g of metallic oxide and a gaseous compound. The vapour density of the gaseous compound is 22. How many moles of the gaseous compound are produced in the reaction?

According to the following chemical equation, what volume of oxygen at S.T.P. is required for the complete combustion of 5 moles of methane? CH₄ + 2O₂ → CO₂ + 2H₂O (a) 224 L (b) 448 L (c) 44.8 L (d) 22.4 L

Find how many g of calcium oxide will be obtained by intensely heating 10 g of calcium carbonate. Consider that calcium carbonate has completely decomposed. [Ca = 40, C = 12, O = 16] (a) 4.4 g (b) 5.6 g (c) 10 g (d) 100 g

How much H2 is obtained when steam is passed over 21 g red hot iron? What would be the volume of that H2 at STP? [Fe=56] [2+1] OR SO3 is prepared by oxidising SO2 in presence of O2. How much SO2 in grams will be required to produce 40 g of SO3? (S = 32, O = 16)

By the reaction of aluminium with 40 grams of metallic oxide and high temperature, 28 grams of the metal and 25.5 grams of aluminium oxide are produced. How many grams of aluminium are required for the reaction? OR The chemical equation for the reaction between sulphuric acid and sodium hydroxide is: H2SO4 + 2NaOH → Na2SO4 + 2H2O How many grams of sodium hydroxide will be required to react completely with 4.9 grams of sulphuric acid? (H=1, O=16, Na=23, S=32). [3]

How many grams of CaCO₃ will react with excess of dilute HCl to produce 66 g of CO₂? [Ca = 40, C = 12, O = 16]

In a closed vessel, 1 g of magnesium is burnt with 0.5 g of oxygen gas. Which reactant remains in excess? Find the quantity of excess reactant. [Mg = 24, O = 16]

What mass of KClO₃ needs to be heated to produce the same amount of oxygen as is obtained by heating 216 g of HgO? [Hg = 200, K = 39, Cl = 35.5, O = 16]