Question # 1

Force per unit area is called:

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volume

pressure

weight

density

Mass no is represented by :

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A

B

C

D

____________ are good conductors of electricity.

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Covalent compound

Metals

Both

None of these

________________ solids are hard.

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Ionic

Covalent

Coordinate

Nil

The branch of chemistry which deals with inter conversion of electrical & chemical energy is:

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Biochemistry

Electrochemistry

Organic chemistry

None of these

Which is used for industrial manufacture of NaCI?

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Daniel cell

Down's cell

Nelson's cell

None of these

Which one of the following non-metal is lustrous?

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Sulphur

Phosphorus

Iodine

Carbon

The boiling point of H2O is:

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100

12

1.105

9

____________ Metals are electronegative in nature.

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Pure-

Noble-

Non-

Nil

Transfer of electrons between atoms results in:

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metallic bonding

ionic bonding

covalent bonding

coordinate covalent bonding

"×" & "." Represent:

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Shells

Neutrons

Electrons

Atoms

Acid used for cleaning metals , tanning and in printing industries, is:

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H2SO4

HNO3

CH3COOH

HCI

Substitution reaction is the characteristics of.

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Alkanes

Alkenes

Alkynes

None of these

Water has a maximum density at .

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10^oC

0^oC

4^oC

100^oC

Which is the major effect of global warming?

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Increase in temperature.

Rise in sea level

Melting of glaciers

All of them

Which one of the following is not faction of crude oil.

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Paraffin wax

Asphalt

Fuel oil

Petroleum coke

Carbon monoxide is harmful to use because it:

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Paralyses lungs

Damages lungs

Reduce oxygen carrying ability of hemoglobin

Make the blood coagulate

Which one of the following is manufactured by Solvar's process:

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caustic soda

washing soda

urea

sulphuric acid

Which of one the following is Lewis base?

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BF3

H+

NH3

Ag+

Coal is the mixture of

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Hydrogen

Methane

Carbon monoxide

All

In which one of the following is a substitution reaction?

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Halogenations of alkynes

Halogenations of alkenes

Halogenations of alkanes

Bromination of alkenes

Hydrogenation of alkenes and alkynes may be carried out at room temperature in the presence of catalyst:

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Pt or Pd

Ni

Zn

Fe2O3

Mass of 22.4 dm3 of N2 at STP is.

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28 gm

14 gm

1.4 gm

2,8 gm

Splitting of spectral lines when atoms are subjected to strong electric field is called.

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Zeeman effect

Stark effect

Photoelectric effect

Compton effect

In Daniel cell, if salt bridge is removed between the two half cells, the voltage.

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Drops to zero

Does not changes

Increases gradually

Increases rapidly

Splitting of spectral lines when atoms are subjected to magnetic field is called.

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Stark effect

Zeeman effect

Photoelectric effect

Compton effect

Bohr's model of atom, is contradicted by.

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Planck quantum theory

Pauli's exclusion prinsciple

Heisenberg's uncertainty principle

All of the above

Suppose a new element 'J' has discovered and has seven electron in the valence shell. Which statement about this element would be correct.

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It is monatomic

It form covalent bond with hydrogen

It forms stable positive ion

It forms covalent bond with group IA element

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

The reaction that involves gases, its rate does not depend upon

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Catalyst

Temperature

Moles dm^-3

Partial pressure

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

According to MOT, which molecular orbital has highest energy.

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sigma 1s

pi+ 2S

pi 2py

Pi+ 2px

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

The Plastic which become soft and melt on heating and can be molded and remolded are called.

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Thermoplastic

Thermosetting plastic

Resin

Melamine

Acetic acid manufactured by

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Distillation

Fermentation

Ozonolysis

Esterification

Sulphur is essential constituent for plants. Which is not role of sulphur

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Chlorophyll development

Development of root system

Constituents of some proteins

Increase transpiration force

Acetic acid is manufactured by

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distillation

fermentation

ozonalysis

esterification

Which of the following sulphates is not soluble in water.

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium Sulphate

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

Which compound is called a universal solvent.

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H2O

CH2OH

C2H5OH

CH5-O-CH3

Which one is not electrophile

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BF3

SO3

AlCl3

NH3

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

When water is added to plaster of paris, it changes to a hard mass. Its volume also expands upto

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1%

2%

3%

5%

Which one of the following elements burns in air to form an oxide which, when shaken with water, give a solution with a pH greater than 7.

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Carbon

Magnesium

sulphur

Hydrogen