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Stoichiometry

Stoichiometry
For a neutral solution (pH = 7), the value of[H⁺] [OH⁻] is equal to

< 1
1
> 1

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Stoichiometry
During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.

Entropy
Internal energy
Enthalpy
Gibbs free energy

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Stoichiometry
With increase in temperature, the surface tension of water

Increases linearly
Remains constant
Decreases
Increases

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Stoichiometry
Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is

0.58
1.72
0.5
0.2

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Stoichiometry
How much O₂ can be obtained from 90 kg of water?

32 kg
64 kg
80 kg
90 kg

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Stoichiometry
Atmospheric pressure corresponds to a hydrostatic head of

13.6 cms of Hg
34 ft ofH₂O
13.6 metres of Hg
1 metre of H₂O

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