Question # 1

Hydrogen has ________________ isotopes.

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1

2

3

4

Which of the following does not affect solubility?

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Temperature

Pressure

Nature OF SOLVENT

Area

Following are elements of 2nd period.Which atom is bigger in size?

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Li

Be

B

C

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

N consist of ________________ sub shells.

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4

1

2

0

The amount of energy given out when an electron is added to any atom is called:

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lattice energy

ionization energy

electronegative

electron affinity

The vapour pressure of a liquid increase with the:

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increase pressure

increase of temperature

increase of intermolecular forces

increase of polarity of molecules

Gases are the lightest form of mater and their densities are expressed in terms of:

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mg cm^-3

g cm^-3

g dm^-3

kg dm^-3

The earth is made up of ___________ % of iron.

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4

5

6

7

The example of solid solute in gas solvent is

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butter

Sugar in water

Smoke in air

Opals

D-block consists of:

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4th,5th & 6th periods

2nd, 3rd & 4th periods

1st, 2nd, & 3rd periods

Silicon occurs in the form of

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Silica

Silicates

both a and b

None of these

If a liquid has a pH of 7 then it must.

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Be a colourless and odourless liquid

Freeze at 0 ^oC and boil at 100 ^oC

Be natural

Be a solution containing water

Which of the following gas is used in warfare?

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Methane

Ethane gas

Mustard gas

None of these

A reaction between an acid and base produce.

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Salt and water

Salt and gas

Salt and acid

Salt and bases

Fossil fuel means.

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Coal

Petroleum

Natural gas

All of them

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

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H2SO4

HNO3

CH3COOH

HCI

Benzene is formed by the polymerization of.

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Alkene

Alkane

Acetylene

Methane.

Human body uses carbohydrates in the form of

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Glucose

Maltose

Fructose

Galatose

Ammonical brine is prepared by dissolving ammonia gas in.

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NaCl

CaCO₃

CaCl₂

Na₂SO₄

The percentage of sun light absorbed by atmospheric gases is.

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2%

10%

18%

25%

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

The number of bonds in nitrogen molecule is

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One o and oneπ

One o and twoπ

Three sigma only

Two o and twoπ

An Ideal gas can not be liquefied because.

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Its critical temperature is always above 0 ^oC

It molecules are relatively smaller in size

Its solidify before becoming a liquid

Force operative between its molecules are negligible

The standard heat of formation is measured at 1 atmosphere and

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0 ^oC

100 ^oC

293 ^oC

25 ^oC

The line of the balmer series in the visible region of the spectrum, but the limiting line, in the series lies in

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Visible region

X-Ray region

I.R region

U.V. region

The wave number of the light emitted by a certain source is 2 x 10⁶m. the wavelength of this light is

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500 nm

500 m

200 nm

5 x 10⁷m

Solvent extraction is an equilibrium process and it is controlled by.

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Law of mass action

The amount of solvent used

Distribution law

The amount of solute

If salt bridge is not used between two half cells, than the voltage.

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Decreases rapidly

Decreases slowly

Does not change

Drops of zero

Which acid has less value of pKa.

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CH3COOH

H2S

H2CO3

HCl

The shape of H₃O is

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Tetrahedral

Angular

Trigonal planer

Pyramidaj

Conduction of electricity through gases under reduced pressure is due to the transportation of.

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positive charge

Negative charge

Both types of charges

None of these

Solubility of which substance decreases by incressing temperature.

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NaNO3

KNO2

NaCl

Ce2(SO4)3

Methyl alcohol is not used

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As a solvent

As an anti freezing agent

As a substitute for petrol

For denaturing of ethyl alcohol

The avoid teh formation of toxic compounds with chlorine which substance is used for disinfecting water.

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KMnO4

O3

Alum

Chloramines

Boric acid is used as eye wash due to its

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Weakly acidic property

Antiseptic nature

Antibiotic nature

Weakly basic properties

Which of the following are mono-saccharides

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Fructose

Sucrose

Stach

Cellulose

Formalin is

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

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

Which of the following is a reddish brown gas

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N₂O₃

NO₂

N₂O₃

N₂O₅

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

What are the total numbers of periods in the modern periodic table

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3

5

7

8

Water is disinfected by a substance to avoid toxification

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KMnO₄

Alums

O₃

Cl₂

SN1 reaction usually occurs in

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All of these