If Avogadro number NA, is changed from 6.022×1023 mol-1 to 6.022×1020 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

Subtopic:  Moles, Atoms & Electrons |
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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. O2, 0.16 g
3. Mg, 0.44 g
4. O2, 0.28 g

Subtopic:  Moles, Atoms & Electrons |
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Which has the maximum number of molecules among the following?

1. 64 g SO2 

2. 44 g CO2

3. 48 g O3 

4. 8 g H2

Subtopic:  Moles, Atoms & Electrons |
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The number of atoms in 0.1 mole of a triatomic gas is (NA= 6.02 x 1023 mol-1)

1. 6.026×1022

2. 1.806×1023

3. 3.600×1023

4. 1.800×1022

Subtopic:  Moles, Atoms & Electrons |
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