Question # 1

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

In each period the element with lest electron affinity belongs to.

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Group 1

Group 14

Group 17

Group 18

Which among the following is a false statement.

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SiO2 has a structure similar to that of CO2

Natural Si exists only in the combined state

Si can be prepared by reducing SiO2 with Mg

Si does not exist in graphite like structure, but exists only ni diamond like structure.

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

A covalent bond which is formed between two atoms by the overlap of atomic orbitals along their axis is called.

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Pi bond

Sigma bond

Polar bond

Non polar bond

Nitric acid is used in manufacturing of.

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Explosive

H2SO4

Fertilizer

All above

The colour imparted by lithium to the flame is.

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Golden yellow

Grasay green

Violet

Red

If Steel is heated to a temperature well below red heat and to then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

Pick out the incorrect statement regarding ozone.

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O3 is an unstbale dark blue diamagnetic gas

The central oxygen in O3 is sp3 hybridized

It cause the tailing of mercury

It does not react with KOH

Formula of orthophosphoric acid

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H2PO4

H3PO2

H2P2O5

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

Which of the following is an example of super octet molecules.

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C1F3

IF7

PCl5

All the three

The most abundant metal in earth's crust is.

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Fe

Al

Ti

Ca

The element with the highest first ionization potential is.

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Boron

Carbon

Nitrogen

Oxygen

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

Boric Acid is used

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In manufacture of pottery glaze

In medicine as an antiseptic

In tanning industry

All above

Aluminium reacts with boiling water to liberatedi hydrogen gas along with the formation of.

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Aluminium oxide

Aluminium hydroxide

Aluminium suboxide

Aluminium superoxide

The alkali metal that react with nitrogen directly to form nitrides.

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Na

K

Rb

Li

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