Question # 1

By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly

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Hard

Brittle

Tough

Soft

Which of the following statements is worng.

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Covalent compounds are generally soluble is polar solvents

Covalent compounds have low melting and boiling point.

Ionic solids do not conduct electricity is solid state

Ionic compounds conduct electricity in the fused state.

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

The percentage of nitrogen in Urea is _____________%

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46

37

82

50

Which of the following species is determined by complex metric titrations.

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K+

Na+

Ca+

Cl-

Which of the following is not a characteristics of solids.

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Definite shape

Definite mass

Definite volume

Fluidity

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

Bond angle is minimum in

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H2O

CO2

NH3

CH4

If the values of standrd deviations for the first and second method differ, then which of the following test helps one to know whether this difference is significant.

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Student's test

F-Test

Chi square test

Standard deviation

Which of the following item is not symmetry element.

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Pllane of symmetry

Inversion centre

Improper rotation

Optical activity

An example of cyclic polyterpenoid is

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Myrcene

Alcoholic

Synthetic rubber

Natural rubber

Given A + 3B ____________ 2C + D

This reaction is first under with respect to reactant A and second order with respect to reactant B . If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would _____ by factor of _____________

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Increase ,2

Decrease ,2

Increase ,4

Decrease ,4

Which of the following statement is false regarding lyphilic sols.

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The colloidal particles show a linking for the dispersion medium

These are generally easy to prepare

These are more stable than lyophobic sols

The stability of the sols is mainly due to the electrical double layer

Which of the following radical is not a member of IV group.

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

Which of the following regions of the spectrum would be used to determine the structure of the crystalline solids.

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Microwave

X-rays

Visible

Infrared

The expected specific waste of food industry is.

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Meats

Nuts

Fats or Oils

All above

When metal orbital are rotated in octahedral field the following representation obtained.

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t2 g + lg

a1 g

t 1 u

All above

Which of the following oxide formed in appreciable quantity in the atmosphere.

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NO

NO2

N2O

All above

The reduction in ozone layer would lead to

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Temperature chages

Rainfall failure

Increase uv radiation on earth

All above

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

Which of the following is not a correct postulate of the kinetic theory of gases.

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The molecules are in random motion

The gaseous collisions are perfectly elastic

The average kinetic energies of different gases are equal at a particular temperature.

The pressure exerted on the walls of the container is due to inter molecular forces.

A group that causes deepning of the colour is known as

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Bathchromic

Hypsochromic

Hypochromic

Hyperchromic

The element having highest ionization energy and least electron affinity belong to

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Period 1 , group 18

Period 2, group 17

Period 2, group 1

Period 2, group 2

The rate constant for 3rd order reaction has the dimentions of.

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mol-2 s-1

I2 mol-2 s-1

mol I -1 s-1

I-1 mol -1 s-1

Which of the following compounds would be most ionic to charcter.

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PbCl4

PbCl2

SnCl4

SnCl2

The juice is allowed to boil at lower temperatures to protect the sugar from

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Hardening

Solubility in water

Caramelization

Dwatering

Which of the following statement is no true with respect to nitrogen dioxide.

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It is produced by the oxidation of NO

Its small concentration has been detected to lower stratosphere

It is major pollutant

It does not absorb sunlight.

Which of the following compounds has highest boiling point.

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HI

HF

HBr

HCl

Hydrogen gas will not redue

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Heated cupric oxide

Headed ferric oxide

Heated stannic oxide

Heated aluminium oxide

For which of the following compounds is the rate of hydrolysis by aqueous alkali most likely to be independent of the hydroxide ion concentration.

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1-Chlorobutane

2- Bromobutane

1- Iodobutane

2- Bromo -2- methyl butane

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