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Chemistry

Chemistry
An element of atomic no. 29 belongs to

S-block
F-block
P-block
D-block

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Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Effluents
Auatic fungi
Aquatic macrophytes
Evapotranspiration

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Chemistry
Which metal does not undergo corrosion due to the formation of oxide layer?

Iron
Zinc
Copper
Aluminium

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Chemistry
How many neutrons are there in 92U238 atom ?

238
330
146
92

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Chemistry
Which of the following will replace hydrogen from acids to form salts ?

S
Na
P
Ag

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Chemistry
Zone refining is used for the purification of

Au
Cu
Ag
Ge

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