Q. No.The relative molecular mass of calcium carbonate is 100. What is the minimum volume of 2.0 M hydrochloric acid that would be needed to completely react with 2.0 g of calcium carbonate?
1. 40 cm3
2. 20 cm3
3. 30 cm3
4. 5 cm3
The density of a 2 M aqueous solution of NaOH is 1.28 g/. The molality of the solution is:
[molecular mass of NaOH = 40 g mol-1]
| 1. | 1.20 m | 2. | 1.56 m |
| 3. | 1.67 m | 4. | 1.32 m |
224 ml of a triatomic gas weighs 1g at 273 K and 1 atm. The mass of one atom of this gas is:
1. 8.30 × 10–23 g
2. 2.08 × 10–23 g
3. 5.53 × 10–23 g
4. 6.24 × 10–23 g
Number of H-atom in 1.7 g of NH3 is:
(NA = Avogadro number)
1. NA
2. 0.1×NA
3. 0.3 × NA
4. 3 × NA
Which of the following contains the maximum number of atoms ?
| 1. | 1 g of Mg(s) | 2. | 1 g of O2 (g) |
| 3. | 1 g of Li(s) | 4. | 1 g of Ag(s) |
| 1. | 40 mol | 2. | 10 mol |
| 3. | 20 mol | 4. | 30 mol |
When 7.3 g of magnesium bicarbonate (Mg(HCO3)2) is decomposed by heating, how much carbon dioxide gas (in mL) is released at STP?
1. 1000 mL
2. 1120 mL
3. 2230 mL
4. 3240 mL
1. 0.01 M
2. 0.001 M
3. 0.1 M
4. 0.02 M
1. 90.0 g conc. HNO3
2. 70.0 g conc. HNO3
3. 54.0 g conc. HNO3
4. 45.0 g conc. HNO3
When \(1.0\text{ g}\) of magnesium (\(\text{Mg}\)) is reacted with \(0.56\text{ g}\) of oxygen (\(\text{O}_2\)) in a closed container, determine the reactant left in excess and calculate the mass of the excess reactant remaining after the reaction is complete: (At. wt. Mg = 24; O = 16)
| 1. | Mg, 0.16 g | 2. | , 0.16 g |
| 3. | Mg, 0.44 g | 4. | , 0.28 g |
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