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Chemistry

Chemistry
The elements with atomic numbers 9, 17, 35, 53, 85 are all

Heavy metals
Halogens
Light metals
Noble gases

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Chemistry
What is the most commonly used substance in fluorescent tubes?

Sodium vapour and neon
Mercury vapour and argon
Mercury oxide and neon
Sodium oxide and argon

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Chemistry
In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?

Aluminium
Iron
Copper
Titanium

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Chemistry
Commercial nitric acid is coloured because it contains dissolved :

Nitrogen dioxide
Oxygen
Nitrous oxide
Coloured impurities

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Chemistry
Silver nitrate solution is kept in brown bottles in laboratory because

It reacts with ordinary white bottles
Brown bottles react with it
Brown bottles stops the passage of light through it
Brown bottles do not react with it

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Chemistry
Which one of the following is used for dating very old objects of archaeological importance?

Carbon-14
Phosphorus-31
Radium
Tritium

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