# If Avogadro number ${\mathrm{N}}_{\mathrm{A}}$, is changed from  to  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

Subtopic:  Moles, Atoms & Electrons |
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20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. The percentage purity of magnesium carbonate in the sample will be?
(Atomic weight of Mg=24)
1. 75
2. 96
3. 60
4. 84

Subtopic:  Limiting Reagent |
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What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% 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

Subtopic:  Equation Based Problem |
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What is the mole fraction of the solute in a 1.00 m aqueous solution?
1. 0.177
2. 0.771
3. 0.0534
4. 0.0177

Subtopic:  Concentration Based Problem |
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The number of water molecules is maximum in
1. 18 molecules of water
2. 1.8 g of water
3. 18 g of water
4. 18 moles of water

Subtopic:  Moles, Atoms & Electrons |
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A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). The molar ratio of the two gases in the mixture will be?
1. 1:4
2. 4:1
3. 16:1
4. 2:1

Subtopic:  Moles, Atoms & Electrons |
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When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), both at  STP, the moles of HCl(g) formed is equal to :

1. 1 mol of HCl(g)
2. 2 mol of HCl(g)
3. 0.5 mol of HCl(g)
4. 1.5 mol of HCl(g)

Subtopic:  Moles, Atoms & Electrons |
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1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and by how much? (At. wt. Mg = 24; O = 16)
1. Mg, 0.16 g
2. ${O}_{2}$, 0.16 g
3. Mg, 0.44 g
4. ${O}_{2}$, 0.28 g

Subtopic:  Moles, Atoms & Electrons |
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The weight of 70% HNOconcentrated nitric acid solution that should be used to prepare 250 mL of 2.0M HNO3  is -
1. 90.0 g conc. HNO3
2. 70.0 g conc. HNO3
3. 54.0 g conc. HNO3
4. 45.0 g conc. HNO3
Subtopic:  Concentration Based Problem |
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6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of the solution is:
1. 0.01 M
2. 0.001 M
3. 0.1 M
4. 0.02 M

Subtopic:  Concentration Based Problem |
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