Chemistry - Comprehensive Mock Test 30

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Question 291 Medium

Out of 92 naturally occurring chemical elements how many are considered as bio?

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Question 292 Easy

Normal valence of nitrogen is ?

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Question 293 Easy

pH value of water is ?

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Question 294 Medium

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is ?

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Question 295 Easy

The chemical name of Chloroform is ?

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