Question # 1

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

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

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Na

Sr

Cs

Rb

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

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

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

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