Stoichiometry
The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be

More acidic
Neutral
Of the same acidity
Basic

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Stoichiometry
Pick out the wrong unit conversion of heat transfer co-efficient.

1 W/m² . °C = 0.1761 BTU/ft².hr.°F
1 kcal/m².hr.°K = 1.163 W/m².°C
1 BTU/ft².hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C
1 kcal/m².hr.°C = 0.2048 BTU/ft².hr. °F. = 1.163 W/m².°K

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Stoichiometry
The heat capacity of a substance is

Greater for liquid state than for solid state
Lower for liquid state than for gaseous state
Equal for solid and liquid states below melting point
Higher for solid state than for liquid state

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Stoichiometry
An ideal gas can be liquified, because

Its molecular size is very small
It gets solidified directly without becoming liquid
Its critical temperature is more than 0°C
Forces operative between its molecules are negligible

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