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# 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%
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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%
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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 |
51%
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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%
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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

3. Newton's law

4. Dulong Petit's law

Subtopic:  Introduction |
65%
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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${\right)}_{2}$

4. M2(SO4)3

Subtopic:  Empirical & Molecular Formula |
62%
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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. ${\mathrm{\omega }}_{{\mathrm{N}}_{2}}={\mathrm{\omega }}_{{\mathrm{O}}_{2}}>{\mathrm{\omega }}_{\mathrm{CO}}$

2. ${\mathrm{\omega }}_{{\mathrm{N}}_{2}}={\mathrm{\omega }}_{\mathrm{CO}}>{\mathrm{\omega }}_{{\mathrm{O}}_{2}}$

3. ${\mathrm{\omega }}_{{\mathrm{N}}_{2}}={\mathrm{\omega }}_{{\mathrm{O}}_{2}}={\mathrm{\omega }}_{\mathrm{CO}}$

4. ${\mathrm{\omega }}_{\mathrm{CO}}>{\mathrm{\omega }}_{{\mathrm{N}}_{2}}>{\mathrm{\omega }}_{{\mathrm{O}}_{2}}$

Subtopic:  Moles, Atoms & Electrons |
51%
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Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of N${\mathrm{O}}_{3}^{-}$ ions in the mixture will be:

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

Subtopic:  Concentration Based Problem |
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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:  Millimole/Equivalent Concept |
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