Question # 1

Industrial materials and thermal power stations are coated by

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PVC

Polyester

Epoxy resin

PVA

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Hard water can block radiators due to formation of

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Insoluble calcium and magnesium salts

Insoluble sodium salts

In soluble phosphate salts

Insoluble potassium salts

Which one of the following is not a component of environment:

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biosphere

stratosphere

hydrosphere

lithosphere

Monohalo derivatives of alkanes are called:

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two glucose molecules

alkyl halide

alkenes

imide

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

Water which his considered to be safe for human consumption is known as

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distilled water

contaminated water

potable water

rain water

Cellulose does:

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Satisfy human appetite

Stimulates intestinal peristalsis

Fives fibre and bulk to the food

All of these

Oxidation of secondary alcohol produces

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Aldehyde

Ketone

Alkyl halide

Ester

Which is unnecessary for purification of water for drink purposes:

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coagulation

aeration

treatment with lodine

treatment with chlorine

The homologous series of aldehydes and ketones have general formula:

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C_nH_2nO

C_nH_nO

C_nH_2n-1O

C_nH_nO_n

In electrolysis of NaCl when Pt electrode is taken then H₂is liberated at cathode while with Hg cathode it forms sodium amalgam

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Hg is more inert than Pt

More voltage is required to deduce H⁺at Hg than Pt

Na is dissolved in Hg while it does not dissolve in Pt

Conc. of H⁺ions is larger when Pt electrode is taken

Addition of iron fillings to CuSO₄solution caused precipitation of Cu owing to the

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Reduction of Cu²⁺

Oxidation of Cu²⁺

Reduction of Fe

Reduction of Fe³⁺

Wacker method involves the conversion of alkene using PdCl₂into corresponding

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Alcohol

Ketone

Aldehyde

Ether

When potassium metal is exposed to violet light

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Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

The absorption of electrons takes place

Keeping in view the size of atoms, which order is the correct one

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > l

Urea has concentration when prepared before prlilling:

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46%

82%

99.7%

100%

Activation energy is the difference of energy between the energy of the reactant and

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The product

The activated complex

Both a and b

None of these

Which compound does not show hydrogen bonding with water

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CH₃OH

C₂H₅OH

CH₃- O - CH₃

C₆H₅OH

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

Heavy water is obtained by

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Prolonged electrolysis of water

Dissolving heavy salt in water

Simple distillation of water

Removing impurities of calcium and magnesium form water

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