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Chemistry

Chemistry
The most electronegative element among the following is

oxygen
bromine
fluorine
sodium

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Chemistry
In a period from Li to F, ionisation potential

Increases
Cannot be predicted
Remains same
Decreases

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Chemistry
Which of the following is used to make light weight, but strong plastic ?

Methyl Methacrylate
Polythene
Polyvinyl Chloride
Nylon

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Chemistry
Percentage of lead in lead pencils is

80
40
31-66

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Chemistry
Nitrogen forms a variety of compounds in all oxidation states ranging from

–3 to + 5
–3 to + 4
–3 to + 3
–3 to + 6

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Chemistry
The first metal used by a man was

Bronze
Copper
Silver
Brass

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