Question # 1

Which one of the following sets of elements has the strongest tendency to form positive ions in gaseous state.

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Li, Na, K

F, Cl, Br

Be, Mg, Ca

O, S , Se

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

Which among the following elements has the highest value of IE.

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Mg

Na

Ca

Sr

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

Which element are non metals.

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N & P

Sb & Bi

As & Sb

N & Bi

The ion that is isoelectornic with CO is

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CN-

O2+

CO2-

N2+

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

In B2H6 molecule

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There exists a direct B-B a -bond

All the atoms are in one plane

All the B-H bonds are normal covalent bonds

There exist two bonds between the boron atoms.

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

Which one of the following has a linear structure.

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H2O

CO2

NO2

SO2

The Lewis structure of which of the following does not have coordinate bond.

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SO2

HNO3

H2SO4

HNO2

The lightest alkali metal is.

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Lithium

Sodium

Rubidium

Caesium

Which of the following is the correct order of interactions.

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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole

Van der Waal's < hydrogen bonding < dipole -dipole < covalent

Van der Waal's < dipole -dipole < hydrogen bonding < covalent

Dipole-dipole < Van der Waal's < hydrogen bonding < covalent

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

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+1

+2

-1

0

In XeF2 molecules, Xe atom undergoes hybridization

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spd

sp2

sp3

sp3d

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

Which one of the following has the biggest electron affinity.

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F2

Cl2

Br2

I2

Group IV A consist of elements

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3

4

5

6

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