Question # 1

One carbon is _________ times heavier than hydrogen.

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12

13

14

15

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

________________ are formed from chemical reactions.

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Elements

Mixture

Substance

Nil

In isotopes numbers of ________________ is same.

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Protons

Electrons

Neutrons

Mass number

Which of the following compound is not directional in its bonding?

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CH⁴

KBr

CO²

H₂O

Which one is strong electrolyte ?

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NH4OH

NaOH

a & b

Nil

Increase in ________________ increase evaporation.

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Temperature

Stronger

All

None of above

All ionic compound are ________________ at room temperature.

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Liquid

Solids

Gas

Plasma

The no. of electrons in the valence shell of alkali metals is

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1

2

4

7

A two component solution is called ____________ solutions.

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Binary

Once

Both

None

Tyndall effect is shown by:

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sugar solution

paints

jelly

chalk solution

Tetra saccharides are classified under.

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Monosaccharides.

Oligosaccharides

Polysaccharides

All of them

Water of crystallization is responsible for.

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Melting points of crystals2

Boiling point of crystal

Shape of crystal

Transition points of crystals

Which of the following gas is used to destroy harmful bacteria in water.

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Iodine

Chlorine

fluorine

Bromine

Which is a hereditary material?

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DNA

RNA

Protein

All of them

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

The % age of drinkable water on earth is

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2.0%

0.02%

0.2%

5.0%

Ethyne is oxidized by alkaline KMnO₄ then ....... hydroxyl group add to the triple bond.

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Two

Three

Four

Five

Monosaccharides are crystalline solids

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Grey

Crimson

Silver

White

The functional group -COOH is found in.

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Aldehydes

Esters

Carboxylic acids

alcohols

Global warming causes rising of the sea level. The cause of global warming is.

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CO₂ gas.

SO₂gas.

NO₂gases.

O₃gas.

The Earth's atmosphere is getting hotter because of.

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Increasing concentration of CO

Increasing concentration of CO₂

Increasing concentration of O₃

Increasing concentration of SO₂

The electron in a subshell is filled according to formula.

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2n²

2(2l+1)

(2l+1)

None of these

Vapour pressure of liquid depends upon

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Amount of liquid

Surface area

Temperature

Size of container

Water and Phenol are partially miscible to each other at room temperature when both liquids are mixed together which is upper layer.

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Water in Phenol

Phenol and water

Pure phenol

Pure water

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

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

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Decrease rapidly

Decrease slowly

Drops to zero

Does not change

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

The unit of mole fraction is

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Moles dm^-3

Moles kg^-1

Gram dm^-3

None

Vapour pressure of a substance does not depend upon.

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Temperature

Intermolecular forces

Surface area

Physical state of water

Which is not chargeable cell

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Lead accumulator

NiCAD cell

Fuel cell

Alkaline battery

the volume occupied by 1.4 of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

The components of which mixture can be separated by sublimation.

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NaCl and Ca cl2

Is and water

Sand and Naphthalene

Blue and red inks

When benzaldehyde is converted to benzyl alcohol by reading with NaOH the reaction is known as.

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Cannizzaro reaction

Wurtz reaction

Wol;ficisthner reaction

Aldol reaction

When methane reacts with Cl2 is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

Which is not a calcarious material.

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Lime

Clay

Marble

Marine shell

The oxides of metal sare generally

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Acidic

Basic

Neutral

Amphoteric

Litharge is chemically

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PbO

PbO2

Pb3O4

Pb(CH3COO)2

The composition of white lead is

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PbCO3.Ph(OH)2

PbCO3.2Pb(OH)2

2PbCO3.Pb(OH)2

PbCO3

Which one of the following compounds is most abundant is nature.

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glucose

Starch

Cellulose

Fructose

One of following is argillaceous material

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Marble

Clay

Lime

Marine Shell

Ethyl alcohol on reacting with orthoboric acid form

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Ethyl borate

Boric acid

Boron acetate

Borax

Which acid is used in the manufacture of synthetic fibre

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

Alkali metal whose carbonate is is relatively less stable and decomposes giving its oxides is.

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Li

Ba

K

Rb