An element X has the following isotopic composition,

200X : 90%, 199X : 8.0%, 202X : 2.0%

The weighted average atomic mass of the naturally occurring element X is closest to: 

1. 201 u 2. 202 u
3. 199 u 4. 200 u

Subtopic:  Moles, Atoms & Electrons |
 62%
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0.24g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance?

(Density of H2 = 0.089)

1. 95.93

2. 59.93

3. 95.39

4. 5.993

Subtopic:  Moles, Atoms & Electrons |
 63%
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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 |
 52%
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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

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%
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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%
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