Question # 1

Which branch of chemistry deals with elements and compounds is earth's crust.

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Polymer chemistry

Organic chemistry

Geochemistry

Physical chemistry

The crystals of whic substance has rhombic shape?

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Brass

Bronze

Sulphur

Grahite

In metals, the hold of nucieus over the valence shell elecrons is veak due to.

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Highlectron affinity

Large sized atoms

High ionization energies

All of the above

Value of Avagadro's number is.

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6.6 x 10^-20

6.02 x 10²³

6.00 x 10²⁴

1.32 x 10²³

Bond dissociation for O2 is

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505 kJ/mol

705 kJ/mol

605 kJ/mol

498 kJ/mol

The boiling point of water is

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O ^oC

100 ^oC

35 ^oC

25 ^oC

²³⁸U₉₂ has number of neutrons.

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92

146

238

330

How many electons can be accommodated in S subshell?

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2

6

14

10

Which Isotopes is commonly used to irradiate cancer cells.

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Cobalt -60

Iodine-23

Carbon -14

Iodine-131

Limes is another name of

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Sodium hydroxide

Sodium Carbonate

Calcium Carbonate

Silicon dioxide

Which one is not an Arrhenious acid?

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HCl

H2SO4

CO2

HNO3

Lewis acid-base concept have the following characteristics except:

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formation of an adduct

Formation of a co-ordinate covalent bound

Donation and acceptance of an electron pair

Donation and acceptance of a proton

Major portion of ozone layer is foun in.

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Which one of the properties of water is responsible for rising of water plants?.

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Specific heat capacity

Surface tension

Excellent solvent action

Capillary action.

About 99% of atmospheric mass lies in.

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35 km

30 km

15 km

16 km

Which help to keep the bowel functioning property

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Dietary fiber

Vitamins

Lipids

Carbohydrates

Normal rain water is:

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weakly acidic

strongly acidic

weakly basic

strongly basic

Formula of Urea is.

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KCNO

H₂N-CO-NH₂

HN-CO₂-NH

H₃N-CO-NH₃

The energy provided by carbohydrates in per gram.

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17 KJ

21 KJ

35 KJ

10 KJ

Specific heat capacity of water is.

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4.2 KJg^-1 K^-1

4.2 Jg^-1K^-1

2.4 KJg^-1K^-1

2.4 Jg^-1K^-1

Which of the following gas is used in warfare?

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Methane

Ethane gas

Mustard gas

None of these

Dichloromethane reacts with halogens in the presence of diffused sun light and produces

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Carbon tetrachloride

Chloroform

Chloromethane

No reaction

The comparative rates at which the solutes move in paper chromatography, depends on

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The size of paper used

Their R_fvalues

Their partition coefficients

The polarity of solvent used

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

The sum of pH and pOH is

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0

7

14

10

Gooch crucible is made of.

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Glass

Paper

Teflon

Procelain

If temperature of one mole of ideal gas at 273 K and one atmospheric pressure is increased by 1 K, amount of energy absorbed is.

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0.082 dm3 atm

1.987 cal.

8.313 J

All are correct.

In a solution 7.8 g of benzene and 46 g of toluene is present The mole fraction of benzene is.

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1/2

1/3

1/5

1/6

Lyman series lies in spectral region

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Infrared

Ultra violet

Visible

None of these

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

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

Drying agent used in crystallization is.

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P2O3

Animal charcoal

KMnO4

Water

The drying agents used in desiccator is.

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BeCl2

MgCl2

CaCl2

SrCl2

Which one is cyclic amino acid

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Glycine

Alanine

Proline

Aspartic acid

The general formula for Alkene having one double bond is

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C_nH_2n+1

C_nH_2n

C_nH_2n-2

C_nH_2n+2

Phenol after reduction with hydrogen changes to

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Picric acid

Benzene

Cyclohexane

Cyclohexanol

Grignard's reagent is reactive due to

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the presence of halogen atom

the presence of Mg atom

the polarity of C-Mg bond

none of the above

When hydrolyzed, protein yields.

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Fatty acid

Glycerol

Amino acid

Nucleosides

A solution of borax in water is.

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Acidic

Alkaline

Neutral

None of these

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

Ethanol on dehydration can be changed to

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Ethene

Diethyl ether

Both 'a' and 'b'

None of these

For which mechanisms, the first step involved is the same

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E₁and E₂

E₂and SN₂

E₁and E₂

E₁and SN₁

Venyl acetylene combines with HCl in

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Polyacetylene

Benzene

Chloroprene

divinyl acetylene

The quality of petroleum is determined by

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Decane number

Octane number

Hexane number

Gold number