Question # 1

Formula of Ozone.

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O₂

S₈

CO₂

O₃

If one mole of carbon contains x atoms what is the number of atoms contained in 12 g of Mg.

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1.5 x

0.5 x

x

2x

Atomic number of lanthanum is

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57

58

59

60

Which is not produced in an aerobic respiration.

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Carbon dioxide

Lactic acid

Water

Energy

Aong the period which one of the followig decreases.

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Electronegativity

Ionization energy

Atomic radius

Electron affinity

Whcih compound contains both covalent and ionic bonds.

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MgCl₂

PCl5

NH₄Cl

CaO

--------------- acts a catalyst promoting the breakdown of ozone.

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I2

Br2

Cl2

None

While baking which gas is responsible for raising the bread and making it soft?

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Oxygen

Carbon monoxide

Carbon di oxide

Nitrogen

Which element is the most reactive element?

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Florine

Oxygen

Chlorine

Nitrogen

All chemical reaction involves.

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Enzymes

Catalyst

Energy changes

All of these

How many atoms are present in one gram of H2O?

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1002 x 10²³ atom

6.022 x 10²³atom

0.334 x 10²³atom

2.004 x 10²³atom

Volatility of hydrocarbons deceases with:

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decrease of molecular mass

increase of molecular mass

increase of double or triple bonds

decrease of triple bonds

Which of the following gas is used in warfare?

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Methane

Ethane gas

Mustard gas

None of these

Formic acid is present in

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String of bees

Sour milk

Apple

Fats

Which one of the following is polmerized to from benzene?

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ethane

ethene

methane

ethyne

Petroleum is refined by:

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destructive distillation

fractional distillation

simple distillation

dry distillation

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

The ability of carbon atom to form chain is called.

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Isomerism

Catenation

resonance

Condensation

Which one of the following is not an air pollutants?

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Nitrogen

Carbon dioxide

Nitrogen oxide

Ozone

Which process is responsible for ascending of water in plants from roots to leaf?

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Condensatin

Transpiration

Capillary action

Evaporation

Dehydrohalogenation takes place in the presence of .

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NaOH aqueous

Alcoholic KOH

Aqeous KOH

Alcoholic NaOH

Malic acid founds in:

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Apple

Fats

Rancid Butter

Oranges

Which of the following has linear structure.

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CO2

NH3

CH4

H2O

Which one of the following relationship is correct about energy and frequency.

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E = hv

E = h/v

E = v/h

h = v/E

The Avogadro constant is the number of.

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Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

Dipole-dipole forces are present among.

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Molecules of Iodine

Atoms of Neon i gaseous state

Chloroforms' molecules

CCl4 molecules

Crystal to diamond is.

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Ionic

Molecular

Covalent

Metallic

During combustion analysis, CO2 produced is absorbed in

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Mg (CLO4)2

50% KOH

CaCl2

P2O5

A solution of sucrose is 34.2% The volume of solution containing one mole of solute.

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500 cm3

1000 cm3

342 cm3

3420 cm3

The nature of copper crystals is

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Metallic

Ionic

Covalent

Molecular

In the ground state of an atom, the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

The S.I. units for the molar heat capacity are

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Joule Cm^-3degree^-1

Joule deg^-1atm^-1

Joule deg^-1mol^-1

Joule deg^-1kg^-1

Solubility of which substance decreases by increasing temperature.

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NaNO3

KNO2

NaCl

Ce2(SO4)3

A polymeric substance that is formed in the liquid state and then hardened to a right solid is called a

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Fiber

Plastic

Varnish

Polyamid resin

Which alkyne reacts with water and form aldehyde

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Ethyne

Propyne

1- Butyne

2- Butyne

The conversion of ethanol to ethene is an example of.

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Dehydration

Hydration

Hydrogenation

Fermentation

The mineral CaSO₄.2H₂O has the general name

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Dolomite

Gypsum

Calcite

Epsom Salt

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%

Ammonium nitrate fertilizers is not used for which crop

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Cotton

Wheat

Sugar cane

Paddy rice

Vegetable oils are

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Polyesters

Glycerides of unsaturated fatty acids

Essential oils

Fatty acids

Phenol when distilled with zinc dust gives.

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Toluene

Benzaldehyde

Benzoic acid

Benzene

The word alkali is derived from which language

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Arabic

Greek

French

German

Air of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

Formula of chloroform is

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃