# 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 |
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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 |
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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 |
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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 |
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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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A sample of pure Cu (3.18g ) heated in a stream of oxygen for some time gains in mass with the formation of black oxide of copper (CuO). The final mass is 3.92 g. The percent of copper remains unoxidised is-

1.$\approx$6.5

2.$\approx$6.9

3. $\approx$7.6

4. $\approx$7.9

Subtopic:  Equation Based Problem |
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One mole of a mixture of CO and CO2 requires exactly 20g of NaOH in solution for the complete conversion of all the CO2 into Na2CO3. How much NaOH would it require for conversion into Na2CO3, if the mixture (one mole) is completely oxidised to CO2?

1. 60g

2. 80g

3. 40g

4. 20g

Subtopic:  Equation Based Problem |
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Versene, a chelating agent having chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2+, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:

1. 100 mg

2. 163 mg

3. 200 mg

4. 263 mg

Subtopic:  Equation Based Problem |
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