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Chemistry

Chemistry
KMnO4 can be used as

Pesticide
Fertilizer
Disinfectant
Insecticide

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Chemistry
The number of neutrons present in an element having mass number 226 and atomic number 88 is :

50
138
88
314

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Chemistry
Maximum permissible concentration of total hardness in drinking water is

500
200
100
50

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Chemistry
The material used in the manufacture of lead pencil is

Lead
Mica
Carbon
Graphite

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Chemistry
An important green-house gas other than methane being produced from the agricultural fields is

Arsine
Nitrous oxide
Sulphur dioxide
Ammonia

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Chemistry
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

periodic table of contents
metallurgy
discovery of elements
atomic structure

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