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Chemistry

Chemistry
Percentage of lead in lead pencils is

31-66
80
40

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Chemistry
Which of the following is an iron ore ?

Magnetite
Bauxite
Lignite
Nitrite

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Chemistry
The percentage of nitrogen present in ammonium sulphate is :

0.27
0.18
0.25
0.305

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Chemistry
In an oxygen molecule, two atoms are united by

Two bonds
One bond
Four bonds
Three bonds

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Chemistry
The trans-uranium elements are the chemical elements with atomic numbers greater than

89
96
92
86

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Chemistry
Which of the following chemicals is used in photography ?

Aluminium hydroxide
Potassium nitrate
Sodium chloride
Silver bromide

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MORE MCQ ON Chemistry

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