Question # 1

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

Ecology is a science of environment and deals specially with

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Stratosphere

Biosphere

Lithosphere

Hydrosphere

The art of electroplating was given by

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Faraday

Edison

Thomas Gradam

Brugan

ph of the buffer CH₃COOh + CH₃COONa is 3.76. If the mixture contains 1 molar acetic acid and 0.1 molar sodium acetate, then pKa of this buffer is

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3.76

4.76

5.76

6.76

Fluted filter paper is used to:

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Decrease rate of filtration

Increase rate of filtration

Maintain rate of filtration

None of above

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

The structure of benzene is

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Hexagonal

Pyramidal

Square planer

Tetrahedral

Which of the following correctly describes the process occurring at the electrodes when molten NaCl is electrolyzed:

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No reaction at anode, reduction at cathode.

No reaction at cathode, oxidation at anode.

Oxidation at anodes, reduction at cathode.

Oxidation at cathode, reduction at anode.

Formalin is an aqueous solution of

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Furfural

Fluorescein

Formaldehyde

Formic acid

Identification of a substance, determination of its structure and quantitative analysis of its composition are the aspects covered by

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Modern analytical physics

Mechanical chemistry

Biochemistry

Modern analytical chemistry

The three N - Hσ-bonds are made by

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sp³- s overlap

sp²- s overlap

P - p overlap

sp - overlap

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

Which of the following is a non-typical transition elements

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Cr

Mn

Zn

Fe

Effective magnetic moment of Sc³⁺ion is

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1.73

0

5.92

2.83

Benzene is obtained from benzene sulphonic acid by treating with

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HCl

NaOH

H₂O

NaHCO₃

Isopropyl alcohol on oxidation forms

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Acetone

Ether

Ethylene

Acetaldehyde

The rate of reaction between two specific time intervals is called

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Instantaneous rate

Average rate

Specific rate

Ordinary rate

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Equal volumes of N₂and H₂are reacting

Equal masses of N₂and H₂are reacting

The reaction has stopped

The same amount of ammonia is formed as is decomposed into N₂and H₂

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1

2

3

4

Buffers having pH less than 7 are made

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Mixture of weak acid + salt of it with strong base

Mixture of weak acid + salt of it with weak base

Mixture of weak base + salt of it with strong acid

Mixture of weak base + salt of it with weak base

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

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Formation of an ester

Protonation of alcohol molecule

Formation of carbocation

Elimination of water

Closed chain compound can be classified into

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Homocyclic

Hetrocyclic

Aliphatic

Both a and b

The process in which solvent particles surround solute particles is called

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Hydrolysis

Hydration

Solvation

Dissolution

Boiling point of n-butane is:

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-102°C

-75°C

-55°C

55°C

A complete chemical characterization of a compound must include

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Qualitative analysis

Chemical analysis

Quantitative analysis

Both a and c

F₂, Cl₂, Br₂and l₂lie below SHE is the Electro chemical series that is why these

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Undergo reduction

Undergo oxidation

Liberate H₂gas with steam

None of these

Borax is hydrated:

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Penta

Deca

Hepta

Octa

Most hazardous metal pollutant of automobile exhaust is

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Mercury

Lead

Cadmium

Copper

which one of the following is a heteroheneous catalysis

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The mass of Al₂S₃formed when 20 grams Al reacts completely with S is

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60 g

50 g

50.55 g

55.55 g

Carboxylic acids having carboxyl group one is called:

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Mono carboxylic acid

Di-carboboxylic acid

Tri carboxilic acid

Tetra carboxylic acid

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