Question # 1

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

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-1 to 0

0 to +5

0 to-1

0 to +1

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

If a graph is plotted between temperature on x-axis and volume on Y-axis for 1 mole of gas,then we get straight line which cuts the temperature axis at

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-300°C

300 K

-273.15 K

273.15°C

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

Which one is very weak acid

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HF

HCI

H2CO3

H2O

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

The % age of nitrogen in ammonia is:

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80%

92%

90%

50%

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Irreversible precipitation of protein caused by heating is called

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Polymerization

Denaturing

Inversion

Co-angular

β-β- dichloroethyle sulphide is commonly known as:

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Mustared gas

Laughing gas

Phosgene gas

Bio gas

In a reversible reaction, two substances are in equilibrium. If the concentration of each one is reduced to half, the equilibrium constant will be

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Reduced to half of its original value

Doubled

Same

Reduced to one fourth its original value

Paraffins are also called

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Alkanes

Alkynes

Alkenes

None of these

When copper is allowed to react with HNO₃, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is

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Cu(NO₃)₂

CuO

O₂

HNO₂

Pb has inert pair of electrons:

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One

Two

Three

Four

Coal heated in the absence of air of about 500 - 1000°C is converted to

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Coke

Coal gas

Coal tar

All above

Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

Quaternary alkyl halides

Primary and secondary alcohols on action of red hot copper give

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Aldehydes and ketones respectilvely

ketones and aldehydes respectively

Only aldehydes

Only ketones

Which one does not declourized KMnO₄

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Alkenes

Alkynes

Bezene

All above

The increase in size of the anion is due to:

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Increase in electron-electron repulsion

Increase in valence shell electrons.

Decrease in valence shell electrons.

Both (a) and (b).

The sun of all the energies of atoms, molecule, ion, within system is called

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Enthalpy

K.E. of the system

Internal energy

None

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