Question # 1

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

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

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

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

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Mg

K

Be

Li

Corrundam is ore of which element?

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Al

Th

In

Mg

Which of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

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 element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

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

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Rose quartz

Smokey quartz

Silica

Opal

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 pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

Which of the following elements is most metallic

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Bi

sb

As

P

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

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Ge

Ar

Kr

He

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

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