Question # 1

The temp. and pressure used for PVC polymerization is

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10°C and 10 atm

20°C and 20 atm

52°C and 9 atm

100°C and 10 atm

During oxidation in k₂Cr₂O_{7, Cr VI changes to :}

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I

II

III

IV

Allyl chloride on dehydrochlorination gives

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Propadiene

Propylene

Allyl alcohol

Acetone

Which among the following elements have lowest value of IE₁?

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Pb

Sn

Si

C

Which of the following solution has the highest boiling point

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5.85% solution of sodium chloride

18.0% solution of glucose

6.0% solution of urea

All have the same boiling point

Which of the following compounds will not give iodoform test on treatment with I₂/ NaOH?

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Acetaldehyde

Acetone

Butane

3-pentanone

Any substance under going physical or chemical change is said to be

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Surrounding

System

Losphere

Lithosphere

Alcohols of low molecular weight are

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Soluble in water

Soluble in water on heating

Insoluble in water

Insoluble in all solvents

RNA is a polymer of nucleotide which consist of three components. Which one is not the component in the nucleotide of an RNA

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D-Ribose

Wracil base

Prosphate group

Thyamine base

Which gas is used for welding purposes

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Butane

Nitrogen

Methane

Acetylene

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

Preparation of vegetable ghee involves:

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Halogenation

Hydrogenation

Hydroxylation

Dehydrogenation

Dehydration of glycerol give

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Propane

Propene

Acrolein

Benzene

Which of the following is weakly acidic in nature

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Alcohol

Phenol

Aidehyde

Amide

Essential amino acids are those amino acids which

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Body can not synthesize

Body can synthesize

α-amino acids

β-amino acids

The colour of transition metal complexes is due to:

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d-d transitions of electorns

Paramagnetic nature of transition

Ionization

Loss of s-electrons

A limiting reactant is one which according to the stoichiometric equation

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Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

A pollutant affects

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Human health

Quality of life

Functioning of ecosystem

All of these

The oxidation number of H is -1 in the compound

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H₂O

H₃BO₃

NaOH

NaH

Optical activity is possible in

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Oxalic acid

Acetic acid

Tartaric acid

Formic acid

Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is

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Na and K

Na and Hg

Hg and Zn

Cu and Te

If we remove one hydrogen atom from an alkane we obtain a group called

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Acetyle group

Formyle group

Alkyle group

Ketyle group

The experimental evidences for the existence of atomic nucleus comes from:

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Line spectrum of hydrogen.

Magnetic bonding of cathode rays.

Millikan oil drop experiment.

Scattering of alpha particles by thin metal foil.

Oxidation of methyl alcohol gives

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Formaldehyde

Acetone

Ester

Acid

Chromic acid used to oxidize

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Aldehyde

Ketone

Both a and b

None of these

Chief air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

Coordinate covalent bond is present in the molecules

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H₂O

BF₃

SiO₂

SO₂

The molarity of toluene solution in benzene is 0.22 if 5 grams of toluene dissolved, then mass of benzene is grams is

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267

260

240

247

Which of the following has more unpaired d-electrons?

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Zn⁺

Fe²⁺

Ni³⁺

Cu⁺

Group l-A elements react with water fastly than the reaction of group ll-A elements because

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

Common names of carboxylic acids are given by then:

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Source

Person discovered

place

habit

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