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Chemistry

Chemistry
Which one of the following species has the highest bond order, shortest bond length and maximum bond strength

O2
O-2
O+2
O-22

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Chemistry
The chemical name of quartz is

Calcium oxide
Sodium silicate
Sodium phosphate
Calcium phosphate

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Chemistry
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

5 gram of molecule
0.5 gram of molecule
1 gram of molecule
10 gram of molecule

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Chemistry
The metal used to recover copper from a solution of copper sulphate is

Hg
Ag
Fe
Na

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Chemistry
Brine refers to :

Starch water
Salt water
Pure water
Sweet water

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Chemistry
The most important ore of lead is

Galena
Siderite
Pyrolusite
Magnetite

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