Question # 1

Existence of an element in more than one crystalline form is known as.

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Anisotropy

Allotropy

Isomorphism

Unit cell

In BeCl2, the covalent bond is formed due to overlap of

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sp -s

sp -p

sp2 -p

sp3 -p

Which of the following wave properties is inversely proportional to the energy for electromagnetic radiations

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Frequency

Wave number

Velocity

Wave length

Which liquid has low boiling point with.

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Less intermolecular force and higher V.P

Greater intermolecular forces and low V.P

Bigger size and greater polarizability

High hydrogen bonding in it

Chromatography is the process which involve the distribution of a solute between

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Two mobile phases

A stationary phase and mobile phase

Two stationary and two mobile phases

Two stationary phases

The partial pressure of oxygen in lungs is

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760 torr

320 torr

159 torr

116 torr

Oxidation number of Cr in a C₂CrO₄ is

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+2

+4

+6

+8

Spectrum produced due to the transition of electron from M-Shall to L-Shell is.

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Absorption

Emission

Continuous

X rays

VSEPR theory was proposed by

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Nyholn and Gillespie

Kossel

Lewis

Sidwick

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

Fuel cells are mostly used in space air crafts as the source of.

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Power only

Drinking water

Drinking water and power

Fuel and drinking water

Which one of the following substances is not used as drying agent in desiccators.

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Calcium chloride

Phosphorus pentoxide

Silica gel

50% NaCl

Which concentration unit is independent of temperature.

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Molarity

Molality

ppm

both a and b

In which one of the following pairs do the molecule have similar shape.

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BF3 and AlCl3

CO2 and H2O

CH4 and PH3

NH3 and BCl3

With increase in 10°C temperature, the rate of reaction double. This increase in rate of reaction is due to

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Decrease in activation energy of reaction

Decrease in the number of collisions between reactant molecules

Increases in activation energy of reactants

Increase in number of effect collisions

Total pressure of mixture of two gases is.

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The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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In the ground state of an atom the electron is present.

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In the nuclsus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

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