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Chemistry

Chemistry
Threshold limit value of copper in the atmospheric air is

0.01 mg/m3
0.001 mg/m3
1.0 mg/m3
5.0 mg/m3

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Chemistry
Which of the following type of coal has the lowest proportion of volatile matter ?

Bituminous
Lignite
Peat
Anthracite

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Chemistry
What is 'milk of magnesia' chemically?

Calcium hydroxide
Magnesium carbonate
Sodium bicarbonate
Magnesium hydroxide

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Chemistry
The most electronegative element among the following is

sodium
fluorine
bromine
oxygen

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Chemistry
The iron ore which contains 72% of iron is :

Siderite
Limonite
Haematite
Magnetite

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Chemistry
Stainless steel is an alloy of

Carbon and iron
Chromium and iron
Chromium and carbon
Chromium, carbon and iron

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