Stoichiometry

91. Atmospheric pressure corresponds to a hydrostatic head of

1. 13.6 cms of Hg
2. 34 ft ofH₂O
3. 1 metre of H₂O
4. 13.6 metres of Hg

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92. Atomic _________ of an element is a whole number.

1. Weight
2. Number
3. Volume
4. Radius

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93. Atoms of the same element, but of different masses are called

1. Isobars
2. Isotones
3. Isotopes
4. None of these

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94. Average molecular weight of air is about

1. 21
2. 29
3. 23
4. 79

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95. Avogadro number is the number of molecules in one _________ of a gas.

1. gram
2. Kilogram
3. gm.mole
4. Litre

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96. Avogadro's number is equal to

1. 6.023 × 1023 molecules/kg.mole
2. 6.023 × 1023 molecules/gm.mole
3. 6.023 × 1016 molecules/kg.mole
4. 6.023 × 1026 molecules/gm.mole

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97. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

1. Cost
2. Electrical conductivity
3. Thermal conductivity
4. Fusion point

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98. Boiling point of a non-homogeneous mixture of immiscible liquids is _________ that of any one of its separate components.

1. Lower than
2. Higher than
3. Equal to
4. Either (A) or (B); depends on the liquids

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99. Boiling point of a solution as compared to that of the corresponding solvent is

1. Less
2. More
3. Same
4. Either more or less; depends upon the solvent

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100. C_p - C_v for an ideal gas is equal to

1. R
2. R/2
3. 2R
4. 3R

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