Question # 1

Which is not an ore of aluminium.

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Baxuite

Cryolite

Monazite

Corundum

Strength of H bond in inter mediate between

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Van der Waals forces and covalent bond

Ionic and covalent bond

Ionic and metallic bond

Metallic and covalent

Which element amongst the following has the highest boiling point.

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Na

Mg

Ca

K

A thionic acid

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H2S2O3

H2S2O6

H2S2O8

H2S2O7

Which one of following is non polar

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CH2Cl2

CCl4

CHCl3

CH3Cl

Reacts violently with water

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AlH3

AlCl3

Lia IH4

Al2Cl6

Helium is used for

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The preservation of food

Filling electrical transformer

Pressuring agent in rockets

All of above

Which of the following statement is not correct.

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The element with highest IE belongs to group 18

In each period the element with lowest IE belongs to group I

In each period the element with highest IE is a noble gas

In the second period as we move from left to right, ionization energy increases reqularly.

Sodium silicate is used

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In the paint industry

For fixing labels to glass

In a soap industry

All above

The bond along Sp2 hybridization is.

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180^o

120^o

109.5^o

160^o

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal

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N2O5

HNO3

SO2

SOCl2

The electronic configuration of some elements are given below. The element with highest electron affinity is

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1s2, 2s2, 2p3

1s2, 2s2, 2p4

1s2, 2s2, 2p5

1s2, 2s2, 2p6

Group III A of the periodic table consist of elemetns.

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3

4

5

6

The common oxidation state of lanthanides is.

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+3

+2

+1

+4

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

Which of the following is not a proper use of Ni.

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It is used as catalyst

It is used in alloy formation

It is used in the preparation of Monel metal

It is attached by alkalis

Magnesium burns in air to give.

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MgO

MgCO3

Mg3N2

Both A and C

The formula of copper pyrite is.

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CuFeS

CuFeS2

Cu2FEs

Cu Fe2S

The only oxidation state of alkali metals in their compounds is.

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+1

+2

-1

0

Which of the following statements about anhydrous aluminium chloride is correct.

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It exist as AlCl3 molecules

It is not easily hydrolysed

It sublimes at 100 ^oC under vacuum

Boron does not form B³⁺ ions

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