Question # 1

In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Corrosion is basically a

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Altered reaction in presence of H₂O

Electrochemical phenomenon

Interaction

Union between two light metals and a heavy metal

The radius of first orbit of H-atom is

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4.75 A°

3.84 A°

8.4 A°

0.529 A°

Wacker method involves the conversion of alkene using PdCl₂into corresponding

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Alcohol

Ketone

Aldehyde

Ether

On hydrolysis of starch, we finally get

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Glucose

Fructose

Both

Sucrose

Almost forward reaction is complete when value of k_{c :}

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Neither larger nor very small.

Very small.

Very large.

Negligible.

Which of these polymers is an addition polymer

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Nylon 6,6

Polystyrene

Terylene

Epoxy resin

The addition of a catalyst to a reaction changes the

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Enthalpy

Entropy

Nature of reactants

Energy of activation

Eutrophication causes reduction in

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Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All the above

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

In a solution of CuSO₄how much time will be required to precipitate 2g copper by 0.5 ampere current?

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12157.48 sec

102 sec

510 sec

642 sec

The catalytic prmoter used for the industrial preparation of acetaldehyde is

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PdCI₂

CuCI₂

Pd + CaCI₂

None of these

Which bond shows maximum hydrogen bonding with water?

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CH₃OH

C₂H₅OH

CH₃----O----CH₃

C₆H₅OH

Boric acid cannot be used:

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An antiseptic in medicine

For washing eyes

In soda bottles

For enamels and glazes

The structure of white phosphorus is

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Square planar

Pyramidal

Tetrahedral

Trigonal planer

The amount of heat evolved or absorbed in a process in the same whether the process takes place in one or several steps is the statement of

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First law of thermodynamics

Hess's law

Coulomb's law

Phase law

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

Cannizzaro's reaction in not given by

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Formaldehyde

Acetaldehyde

Benzaldyhyde

Trimethylacetaldehyde

DNA is a polynucleic acid. The monomer is known as a nucleotide. What is not the component of the nucleoptide

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Phosphate group

Deoxy ribose sugar

Uracil base

Adenine base

Copper oxide is dedected by borax bead test with colour:

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Blue

Red

Yellow

Black

Which one of the following metal ions is colourless?

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V²⁺

Cr³⁺

Zn²⁺

Ti³⁺

Chemical composition of colemnite is:

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Ca₂B₆O₁₁.5H₂O

CaB₄O₇ .4 H₂O

Na₂B₇O₇. 4 H₂O

CaNaB₅O₉.8H₂O

SO₂Makes ______ acid rains

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Carbonic acid

Sulfuric

Nitric acid

All of these

Sodium is manufacture by the electrolysis of fused sodium chloride and not from an aqueous solution of sodium chloride because

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Sodium chloride does not ionize in the water solution

Sodium chloride is not soluble in water

Sodium deposited at the cathode may react with water to form sodium hydroxide

Electricity does not pass through aqueous NaCl

The reaction of alcohol with SOCI₂in the presence of pyridine as catalyst gives

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Acids

Acid chloride

Alkyl halide

Benzene

Bakelite is a product formed form

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Reaction of formaldehyde with phenol

Reaction of polyethylene with phenol

Reaction of polypropylene with acid

It is a natural product

Which of the following is present in the stings of bees and wasps

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Formic acid

Citric acid

Carbolic acid

Formalin

Which of the following phosphorus is most reactive?

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Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

Na reacts with phenol to produce

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H₂gas

Benzene

CO₂gas

CO gas

The total number of rare earth elements is

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8

32

14

10

Quantum number values for 2p orbitals are

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n = 2, l = 1

n = 1, l = 2

n = 1, l = 0

n = 2, l = 0

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