Question # 1

Which of the following is the most stable towards heat.

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CaCO3

BaCO3

Na2CO3

MgCO3

In 1952 who popularized the use of CFT for inorganic chemist

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Bethe

Orge

Van Vleck

Werner

Which of the following is most soluble in water

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CaSO4

Sr SO4

MgSO4

BaSO4

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

The carbonate of which of the following will have highest lattice energy.

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Barium

Magnesium

Calcium

Strontium

Oxidation state of the chromium [Cr(NH3)6]3+ complex ion is

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+2

+3

+4

+5

Which one of the following has the biggest electron affinity.

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F2

Cl2

Br2

I2

Helium contents in the atmosphere by volume.

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0.0005%

0.0015%

0.0001%

0.00001%

Anhydrous AlCl3 cannot be obtained by heating hydrated AlOI3 ,6h2o Because.

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It decomposes completely to give Al2O3

It does not lose water completely

It undergoes hydrolysis to give Al(OH)3

AlCl3 .6H2O is very stable.

The concentration of OH- ions in a certain household ammonia solution is 0.0025. This ammonia solution is.

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Basic

Acidic

Neutral

None of above

The correct order of electron affinities of SI, P, and Cl is.

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P > Si > Cl

Cl > P > Si

Cl > Si, > P

Si > P . Cl

Nitrogen (N2)) is relatively unreactive because.

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Its electronegativity is high

Its dissociation energy is large

Its atomic radius is small

It is the first element of group 15

Which of the following process is involved in the purification of crude metals.

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Liquation process

Oxidation process

Distillation process

Electro refining

Oxalic acid when heated withe conc. H2SO4 it gives out.

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H2O and CO2

CO and CO2

CO2 and H2S

Oxalic sulphate

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

Metal are

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Hard

Ductile

Malleable

All

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

Which of the following is not known.

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KrF6

XeF6

XeO3

KrF2

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

The three dimensional silicate anion (Si2O5^2-)n is present in

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Beryl

Silica

Asbestos

Clays

The number used in cancer therapy is.

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Fe

Co

Ni

Rn

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