Question # 1

Water which forms scum with soap is called

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Hard water

Soft water

Distilled water

Un distilled water

Which of the following is precursor of T3 and T4

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Gaba

Dopa

B-Alanine

Di-iodotyrosine

Which of the following is a thermosetting plastic?

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PVC

polyethylene

polystyrene

melamines

Albumin, globin and casein are

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Milk proteins

Plasma proteins

Egg proteins

Meat proteins

In the electronic configuration of Cr one electron from 4s sub-shell is transferred to 3d sub-shell because

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The 3d orbital is of lower energy than 4s

The half-filled d-subshell is more stable than 4 electrons having d-subshell

The 4s orbital is of equal energy to 3d orbital

6 unpaired electron make Cr more paramagnetic

Primar structure of proteins refers to

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Coling and folding in form of specilie structure

3d structure

Number of amino acids in a chain

Alpha and Beta sheets

The cause of minamata disease is the pollution of

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Arsenic (As) into atomosphere

Industrial waste having Hg

Organic waste in drinking H₂O

Oil spills in H₂O

What is correct about heat of combustion

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It is applicable to gaseous substances only

It is always negative

It is always positive

It is positive in some cases while negative in other

Buffer solutions are used in except

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Clinical analysis

Nutrition

Soil science

Qualitative analysis

In macromolecules DP stands for

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Dissociation parameter

Dissociation polymer

Degree of polymerization

None of these

Water has high boiling point which is due to

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weak dissociation

hydrogen bonding

high specific heat

high dielectric constant

When acetylene is passed through a copper tube at 300°C, it polymerizes to

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Polyacetylene

polyethylene

Benzene

None of these

Ammonia like water also reacts with Grignard's reagent to give

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Alkane

Alkene

Alkyne

Amide

Which is the formula of tetra-ammine chloro-nitro platinum (IV) sulphate

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[Pt(NH₃)₄(NO₂)] SO₄

[Pt NO₂CI(NH₃)₄] SO₄

[Pt CI(NO₂) (NH₃)₄] SO₄

[Pt (NH₃)₄(NO₂) CI] SO₄

What is the name of the comlex [Ni(CO)₄]

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Tetracarbonylnickel (o)

Tetracabonylnickel

Tetracabonylnickel (II)

Tetracabonylnickel (IV)

Eutrophication causes reduction in

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Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All the above

Which reaction yields Bakelite?

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Urea with HCHO

Tetramethyl glycol with Hezamethylene diisocyanate

Phenol and HCHO

Ethylene glycol and Dimethylterephthalate

The order of reactivity of halogen acids towards alkenes

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HCl > HBr > Hl

HBr > HCl > HI

HCl > HBr

HI > HBr > HCl

Thre rate of S_N2 reaction depends upon the

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Concentration of alkyl halides

Concentration of nucleophile

Concentration of alkyl halides and nucleophile

None of the above

Give IUPAC name fo Acetone

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Ethanal

Propanone

Butanone

Propanal

The order of decreasing ease of reaction with ammonia is

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Anhydrides, esters, ethers

Anhydrides, ethers, esters

Ethers, anhydrides, esters

Esters, ethers, anhydrides

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

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