Question # 1

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

Give violet colour to flame

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Gallium

indium

Thallium

Aluminium

Which of the following exists as polymeric chains in solid state.

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

The decreasing order of the second ionization energies of K, Ca and Ba is

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K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

The 'shape' of molecule ." Xe F6 is.

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Pentagonal bipyramidal

Regular octahedral

Distorted octahedral

Square planar

The bond along Sp2 hybridization is.

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180^o

120^o

109.5^o

160^o

Which of the following is soluble in water.

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AgF

AgCl

AgBr

Ag I

The total number of bond pairs around sulphur and total number of lone pairs around oxygen atoms in the Lewis structure of sulphate ion are respectively.

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4, 12

8,12

12,4

6 ,12

Considering the element B,C, N, G and Si, the correct order of their non- metallic character is.

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B > C > Si > N > F

Si > C > B > N > F

F > N > C > B > Si

F > N c > > SI > B

Co ordinate covalent bond found is formed by the

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Transference of electrons

Sharing of electrons

Donation of electrons

None of these

The process of heating to redness and then slow cooling in known as

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Tempering

Annealing

Quenching

Hardening

Shows a regular increase on moving down the group form carbon to lead

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Atomic volume

Atomic radius

Density

All above

Pick out the incorrect statement for SO2

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It turns filter paper moistened with acidified K2Cr2O7

It turns starch iodate paper blue

It does not react with chlorine in presence of charcoal

It decolourises acidified KMnO4 solution.

Elements in which differentiating electron enters the (n-1) the d-orbitals of the (n-1) the main shell are called elements.

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s- block

p-block

d-block

f-block

Which of the following compounds is electrovalent in nature.

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SO2

ICI

KBr

CHI3

Acid rain effects

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Human being

Crops

Aquatic life

All above

Which of the following represents the correct order of ionic radii

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La+ < Na+ < K+ < Rb+

Li+ > Na + > K+ >Rb+

Li = Na + = K+ = Rb+

Rb +> Na+> K+ > Li+

The formula of Tetraboric acid is.

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H2BO3

HBO2

H2B4O7

H6B4O9

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

The electronegativity of phosphorus is.

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3.0

2.1

2.0

1.9

In the formation of H2O molecule, the oxygen atom makes use of.

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2p orbitals

sp hybrid orbitals

Sp2 hybrid orbitals

Sp3 hybrid orbitals

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