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Chemistry

Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

3
1
4
2

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Chemistry
Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ?

Ethane
Methane
Propane
Butane

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Chemistry
The chemical name of quartz is

Calcium oxide
Sodium silicate
Sodium phosphate
Calcium phosphate

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Chemistry
German silver, an alloy, does not contain the metal

Silver
Nickel
Copper
Zinc

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Chemistry
The main constituent of natural gas is

Ethane
Methane
Butane
Propane

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Chemistry
Which of the following has least negative electron gain enthalpy

P
Cl
F
S

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