Question # 1

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

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

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

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

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

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

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Na

Sr

Cs

Rb

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

One of the following does not give the flame test. Which is that

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Sr

Bа

Be

Na

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

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

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