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Chemistry

Chemistry
The heat value of combustion of Gasoline is

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

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Chemistry
In arc welding, Argon is used because of its

High flammability
High calorific value
Ability to lower the melting point of the metal
Low reactivity with metal

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Chemistry
When there are two electrons in the same orbital, they have:

Same or opposite spin
Opposite spin
Same spin
No spin

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Chemistry
Which of the following elements is found in all organic compounds

Carbon
Calcium
Oxygen
Nitrogen

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Chemistry
Gobar gas mainly contains

Methane
Carbon monoxide
Hydrogen sulphide
Carbon dioxide

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Chemistry
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

zero
5
2
4

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