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Chemistry

Chemistry
Which of the toxic heavy metals is found in modern tannery industries ?

Chromium
Lead
Nickel
Zinc

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Chemistry
The high reactivity of fluorine is due to

its high electro negativity
small size of fluorine atom
availability of d-orbitals
strong F - F bond

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Chemistry
Which among the following coal contains 90 per cent of carbon?

Peat
Bitumen
Anthracite
Lignite

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Chemistry
Cement containing excess amount of lime

Becomes more strong
Cracks during setting
Is quick setting
Is slow setting

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Chemistry
Mercury is a :

Liquid non-metal
Solid non-metal
Liquid metal
Solid metal

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Chemistry
Which of the following is also used as a Bio fertilizer?

Uric Acid
Urea
None of these
Ammonia

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