lf Nis Avogadro's number, then the number of valence electrons in 4.2 g of nitride ions (N3-) will be:

1. 3.2 NA 2. 1.6 NA
3. 2.4 NA 4. 1.2 NA

Subtopic:  Moles, Atoms & Electrons |
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ln the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\)
the number of significant figures after solving the expression is:

1. 2 2. 4
3. 6 4. 7
Subtopic:  Introduction |
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The volume of carbon dioxide gas evolved at STP by heating 7.3 g of Mg(HCO3)2 will be -

1. 1000 mL

2. 1120 mL

3. 2230 mL

4. 3240 mL

Subtopic:  Moles, Atoms & Electrons |
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The amount of Zinc (atomic weight=65) necessary to produce 224 mL of H2 (at STP) by the reaction with dilute sulphuric acid will be: 

1. 0.65 g 2. 7.6 g
3. 6.5 g 4. 8.5 g
Subtopic:  Limiting Reagent |
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On complete decomposition, the volume of CO2 released at STP on heating 9.85 g of BaCO3 (atomic mass, Ba=137) will be: 

1. 1.12 L

2. 4.84 L

3. 2.12 L

4. 2.06 L

Subtopic:  Limiting Reagent |
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Specific volume of cylindrical virus particle is 6.02×10-2 cc/g. Whose radius and length are 7 Å and 10 Å respectively. If NA=6.02×1023, the molecular weight of virus is -

1. 15.4 kg/mol

2. 1.54×104 kg/mol

3. 4.68×104 kg/mol

4. 2.08×103 kg/mol

Subtopic:  Moles, Atoms & Electrons |
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The weight of 1x1023 molecules of CuSO4.5H2O is: 

1. 34.42 g

2. 41.42 g

3. 54.44 g

4. 68.94 g

Subtopic:  Moles, Atoms & Electrons |
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The molality of 0.01 M Na2CO3 solution is -
(density of the solution is 1.1 g/ml)

1. 9×10-3

2. 1.8×10-3

3. 4.5×10-3

4. 1.1×10-3

Subtopic:  Concentration Based Problem |
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A chloride of a metal (M) has 65.5% of chlorine. 100 ml of vapour of the chloride of metal at STP weighs 0.72 g. The molecular formula of this metal chloride is

1. MCl3 

2. MCl4 

3. M2Cl3 

4. MCl5 

Subtopic:  Moles, Atoms & Electrons |
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If 3.02×1019 molecules are removed from 98 mg of H2SO4, then the number of moles of H2SO4 left are -

1. 0.1×10-3

2. 9.5×10-4

3. 1.2×10-4

4. 0.5×10-3

Subtopic:  Moles, Atoms & Electrons |
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