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Stoichiometry

Stoichiometry
The viscosity of water at room temperature may be around one

Centipoise
Poise
Stoke
Both B & C

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Stoichiometry
In a neutral solution

OH⁻ ions are absent
H⁺ ions are absent
None of these
Both H⁺ and OH⁻ ions are present in very small but equal concentration

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Stoichiometry
Percentage saturation of a vapor bearing gas is always __________ the relative saturation.

Either A or B; depends on the system
Higher than
Smaller than
Equal to

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Stoichiometry
The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75ρ at a temperature of __________ °K

400°
273°
300°
300°

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Stoichiometry
The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

0.6
0.4
0.8
0.2

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Stoichiometry
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

350
345
485
140

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