Question # 1

What is the formula of clay?

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Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

Which of the following element has high m.p and b.p, it acts as a reducing agent, and can react with bases?

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Sr

Ca

Be

Mg

Which compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

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