Milk tastes sour when it is left in open for some time.This happens due to the formation of
1). Lactic acid
2). Citric acid
3). Acetic acid
4). Carbonic acid
The chemical name of 'laughing gas is
1). Nitric oxide
2). Nitrogen dioxide
3). Nitrogen pentoxide
4). Nitrous oxide
Cement is usually a mixture of
1). Calcium silicate and calcium aluminate
2). Calcium silicate and calcium ferrate.
3). Calcium aluminate and calcium ferrate
4). Lime stone and silicon dioxide
The important ore of aluminium is
1). bauxite
2). cryolite
3). fluorspar
4). haematite
Which of the following is an iron ore ?
1). Bauxite
2). Magnetite
3). Lignite
4). Nitrite