Question # 1

An atom with high electronegativity has

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Large size

High ionization potential

Low electron affinity

Low ionization potential

For which system does the equilibrium constant Kc has units of (concentration)^-1

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Which of the following alkali metals does not exist naturally

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Francium

Rubidium

Lithium

Cesium

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

Which of the following ion has the highest value of ionic radius?

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Li⁺

F^-

O^2-

B³⁺

Which one of the following aqueous solutions has highest pH:

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0.1M HNO₃

0.1M HCI

0.02MH₂SO₄

0.1M NaOH

How does the ionization energy of 1st group elements vary?

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Increases down the group

Decreases down the group

Remains unchanged

Variation is not regular

The most acidic oxide among the following is:

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CI₂O₇

Na₂O

AI₂O₃

P₄O₁₀

In an exothermic reversible reaction increase in temperature shift the equilibrium to:

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Remains unchanged

Product side

Reactant side

None of above

According to the Periodic Law of elements, the variation in properties of elements is related to their

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Atomic masses

Nuclear masses

Atomic numbers

Nuclear neutron-proton number ratios

The unit of concentration is

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mol. ml

mol dm^-3

gm equivalent lit^-1

g lit^-1

Solubility product

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is not for sparingly soluble ionic compounds

is for sparingly soluble ionic compounds

is useful for soluble ionic compounds

none of these

Mark the longest period of the longest period of the periodic table:

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4th

6th

3th

7th

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0.004

0.080

0.016

0.160

Which one of the following has highest pH:

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Distilled water

Water saturated with chlorine gas

1M NH₄OH

1M NaOH

The group number of element in periodic table indicates

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Valency with respect to hydrogen

The number of electron in the outermost shell

The atomicity

Number of shell

Point out one of these that does not reflect the periodicity of the elements:

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ionization potential

electronegativity

bonding behavior

neutron/proton ratio

The ionization potential is lowest for the

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Halogens

Inert gases

Alkaline earth metals

Alkali metals

The oxide of which of the following elements will be acidic in character

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Mg

Rb

Li

CI

The compound having lowest boiling point is:

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H₂S

H₂Se

SiH₄

SnH₄

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