The hydrated salt, Na2SO4.nH2O, undergoes a 55% loss in mass on heating and becomes anhydrous. The value of n will be:

1. 5 2. 3
3. 7 4. 10

Subtopic:  Empirical & Molecular Formula |
 53%
From NCERT
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12 g of Mg (atomic mass = 24) will react completely with an acid to give:

1. One mole of H

2. Half mole of H2

3. One mole of O2

4. None of the above

Subtopic:  Equation Based Problem |
 69%
From NCERT
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The molality of a 15% (w/vol.) solution of H2SO4 of density 1.1g/cm3 is-

1. 1.2

2. 1.4

3. 1.8

4. 1.6

Subtopic:  Concentration Based Problem |
 52%
From NCERT
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Which mode of expressing concentration is independent of temperature?

1. Molality

2. Percent by mass

3. Mole fraction

4. All of the above 

Subtopic:  Concentration Based Problem |
 74%
From NCERT
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The product of atomic mass and specific heat of metal is approximately 6.4. This was given by:

1. Dalton's law

2. Avogadro's law

3. Newton's law

4. Dulong Petit's law

Subtopic:  Introduction |
 67%
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A metal M forms a compound M2HPO4. The formula of the metal sulfate is:

1. M2SO4 

2. MSO4

3. M(SO4)2

4. M2(SO4)3

Subtopic:  Empirical & Molecular Formula |
 62%
From NCERT
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A partially dried clay mineral contains 8% water. The original sample contained 12% water and 45% silica. The percentage of silica  in the partially dried sample is nearly:

1. 50% 2. 49%
3. 55% 4. 47%
Subtopic:  Concentration Based Problem |
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One litre N2, 7/8 litre O2 and 1 litre CO are taken in a mixture under indentical conditions of P and T. The amount of gases present in mixture is given by:

1. ωN2=ωO2>ωCO 

2. ωN2=ωCO>ωO2 

3. ωN2=ωO2=ωCO

4. ωCO>ωN2>ωO2

Subtopic:  Moles, Atoms & Electrons |
 52%
From NCERT
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Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of NO3- ions in the mixture will be:

1. 0.1M 2. 0.05M
3. 0.2M 4. 0.15M

Subtopic:  Concentration Based Problem |
From NCERT
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A solution contains Na2CO3 and NaHCO3. 10 mL of the solution required 2.5 mL of 0.1 M H2SO4 for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H2SO4 was required. The amount of Na2CO3 and NaHCO3 in 1 litre of the solution is:

1. 5.3g and 4.2g

2. 3.3g and 6.2g

3. 4.2g and 5.3g

4. 6.2g and 3.3g

Subtopic:  Equivalent Concept |
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