Question # 1

Rectified spirit contains alcohol about:

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80%

85%

90%

95%

The molal elevation constant is the ratio of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solute

Mole fraction of solvent

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ion in filtrate?

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Ag⁺ and NO_3- only

Ag⁺ and Ba² and NO^-3

Ba² and NO^-3

Ba² and NO^-3and Cl-

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

The reactivity order of alkyl halides for a paricular alkyl group is

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Fluoride > chloride > bromide > iodide

Chloride > bromide > fluoride > iodide

Iodide > bromide > chloride > fluoride

Bromide > iodide > chloride > fluoride

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Condensation

Electrophilic substitution

Free radical substitution

Nucleophilic substitution

Among the following the most reactive towards alcoholic KOH is

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CH₂= CHBr

CH₃COCH₂CH₂Br

CH₃CH₂Br

CH₃CH₂CH₂Br

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Replacement of hydrogen atom by - SO₃H group in benzene is called

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Nitration

Alkylation

Sulphonation

Acylation

Which of these polymers is a synthetic polymer?

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Animal fat

Starch

Cellulose

Polyester

Hydrocarbons are organic compounds which contain elements such as

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Hydrogen

Carbon

Hydrogen and carbon

Halogens

10 ml of 1.5 M NaOH solution is neutralized by 20 ml of a-M HCl solution. The value of 'a' will be

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1.0

0.75

0.5

0.25

Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre

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Ch₃CHO

CH₃CH₂COCH₂CH₃

CH₃CO₂CH₃

HCHO

Most common oxidation states shownby cerium are

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+2, +4

+3, +4

+3, +5

+2, +3

Aldehydes are reduced to :

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Pri-alcohol

Sec-alcohol

Ter-alcohol

All of these

The amino acids which human body can synthesize are called ______ amino acid

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Essential

Non essential

Acidic

Basic

Alkyl halides on treatment with metallic Na give

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Alkynes

Alkenes

Alkanes

Alcohols

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di(4-bormophenyl) method

Methanol

Propan-1-ol

Propan-2-ol

Oxidation of methyl alcohol gives

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Formaldehyde

Acetone

Ester

Acid

The total number of transition elements is:

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10

14

40

50

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

The ionization constant of an acid is expressed in term of the following constant

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Kw

Kn

Ka

Kb

Mustard gas is a

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Gas

High boiling speed

High melting liquid

Steam

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

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5 x 10^-9

5 x 10^-12

5 x 10^-6

5 x 10^-10

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

The formula of esters is

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The natural fertilizers consist of

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Plants

Animals

Both plants and animals

Microorganisms

For principle quantum number n=4, the total number of orbitals having l = 3 is

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3

7

5

9

The number of coulombs required for the deposition of 107.870 g of silver is

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96500

48250

193000

10000

Ketons are prepared by the oxidation of

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

The nitrogen present in some fertilizers helps plants

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To fight against disease

To produce fat

To undergo photosynthesis

To produce protein

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