Question # 1

Considering the elements F, Cl ,O and N, the correct order of their chemical reactivity in terms of oxidizing property is.

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F > Cl > N

F > O > Cl > N

Cl > F > O > N

O > F > N > Cl

Which of the following statements is incorrect.

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The elements of group 18 are known as aerogens.

Group 2 elements are all metals

Metallic character increase on going down a group

All the elements belonging to a particular period have same valence shell configuration.

Of the following the commonly used n the laboratory desiccator is.

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Anhyd. Na2Co3

Anhyd Ca Cl2

Dry NaCl

None of the above

Keeping in view the periodic law and periodic table, suggest which of the following elements should have maximum electronegative character.

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Oxygen

Nitrogen

Fluorine

Astatine

Which of the following elements would have the lowest first ionization energy

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Mg

Rb

Li

Ca

Xenon reacts best with

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The most electropositive elements

The most electronegative elements

The hydrogen halides

Non metals

Which of the following statements is correct.

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A sigma bond is weaker than a pi pond

There are four coordinate bonds in the Lewis structure of NH4+ ion.

The 1 covalent bond is directional in nature

A single bond between the two atoms cannot be re bond.

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

Which ionization Potential in the following equations involves the greatest amount of energy.

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Na = Na+ + e

K = K+ +e

C2+ = C3+ +e

Ca+ = Ca2+ + e

The first noble gas compound was

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XeO3

XeF4

XeF6

Xe +[PtF6]

Which of the following state is not true with respect to copper.

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it is malleable and ductile

It is a best conductor of heat and electricity

It forms alloys easily

Moltan copper absorbed carbon dioxide

Which of the following iso -electronic ion would require least energy for the removal of electron.

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Ca2+

Cl-

Ar-

K+

Highly dangerous acid and produces severe wounds on the skin.

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HCIO

HCIO2

HCIO3

HCIO4

Among the elements of second period the element with highest melting point belongs to group.

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1

14

17

18

An ionic compound X + Y - is most likely to be formed if

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Ionization enthalpy of X is high electron gain ethalpy of Y is low

Ionization enthalpy of X is high electron gain enthalpy of Y is high

Ionization enthalpy of X is low,electron gain enthalpy of Y is low

Ionization enthalpy of X is low electron gain enthalpy of Y is high

Strong field ligands such as CN

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Usually produce high spin complexes and small crystal field splitting

Usually produce low spin complexes and small crystal field splitting

Usually produce low spin complexes and high crystal field splitting

Cannot form low spin complexes

Increasing oxygen contents in oxyacids leads to.

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An increase in thermal stability

An increase in acid strength

A decrease in oxidizing power

All above

Which of the following is the strongest oxidant.

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F2

Cl2

br2

I2

Tetra halides do not undergo hydrolysis

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C

Si

Sn

Pb

Which element out of the following can exhibit a maximum co valency of seven.

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Chlorine

Fluorine

Sulphur

Both Cl and F

H-Bonding also ox in ling system like

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Protein

DNA

Botha A and B

None of above

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