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Chemistry

Chemistry
Which of the following has pH value 7?

HCl
Pure Water
Sodium Carbonate
H2SO4

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Chemistry
'Plaster of Paris' is made by partial dehydration of

Blue vitriol
Epsom salt
Gypsum salt
Green vitriol

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Chemistry
Rock salt is a mineral containing

Sodium
Iron
Potassium
Magnesium

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Chemistry
The metal present in vitamin B12 is

Fe
Mg
Mo
Co

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Chemistry
Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?

Nitrous oxide
Sulphur dioxide
Carbon dioxide
Chlorofluorocarbon

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Chemistry
The most electropositive elements among the following is

Ca
K
Na
Cs

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