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CHEMISTRY

Chemistry
Which of the following is the best fuel in terms of energy released per gram of fuel?

Hydrogen
Methane
Butane
Ethanol

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Chemistry
The heat value of combustion of Gasoline is

14600 kJ/kg
39400 kJ/kg
47000 kJ/kg
12600 kJ/kg

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Chemistry
Which one of the following gases has the highest calorific value?

Indane gas
Water gas
Natural gas
Coal gas

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Emission spectra
Absorption spectra
Raman spectra
Fluorescence

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Chemistry
If the equilibrium constants for the systems H2 + I2 ? 2HI and 2HI ? H2 + I2 are K1 and K2 respectively, the relationship between K1 and K2 is :

K 1 = 1 /K2
K1 = K2/2
K1 = 2K2
K1 = K2

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