Question # 1

A molecule is said to be chiral

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If it contains plane of symmetry

If it contains centre of symmetry

If it can be superimposed on its mirror image

None of the above

The half life for a first order reactions 32 s, What was the original concertation if after 2.0 minutes, the reactant concentration is 0.062 M.

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0.84 M

0.069 M

0.091 M

0.075 M

An acid base titration involves a neutralization reaction in which an acid is reacted with an equivalent amount of base The titrant is always a strong acid or base The analyte may be

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Strong acid

Strong base

Weak acid and Weak base

All above

Combination of a -amino acid through which linkages results result in formation of protein

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Ester linkage

Glycosidic linkage

Lactum linkage

Peptide linkage

Which of the following analytical method is based on scattering of radiation.

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Emission spectroscopy

Colorimetry

Turbidimetry

Polarimetry

Which of the following species is very good oxidizing agent.

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MnO₄

H+

Zn²⁺

Fe³⁺

Which one of the following statements is not true.

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Transition metals form alloys

Transition metals form complexes

Zn, Cd and Hg are transition metals

K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn

Select the correct IUPAC name for [FeF4(OH)2]-

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Diaquatrafluoriron (III) ion

Diaquateratrafluoriferrate (III) ion

Diaquatertrafluoroiron (I)

None of these

The unit of nucleic acid having base sugar combination is called.

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Nucliec acid

Nucleoside

Nucleotide

None of these

Photochemical smog is caused primarily by

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CO

CO2

NO2

O3

Which of the following is not correct criteria for an idea solution.

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Enthalpyh of mixing = 0

Volume of mixing = 0

Free energy of mixing = 0

Obeys Reoult's law

A mixture containing S2- and SO4 ions on trating with dil HCl will produce

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H2S gas

SO2 gas

H2S and SO2 gas

CO

Carbylamine reaction proceeds via the intermediate formation of.

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Alkyl isocyanide

Chloride ion

Alkyl carbonion

Dichloro methylene

Which of the following techniques is involved in purification of organic compound.

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Distillation

Sublimation

Solvent extraction

All above

Metal crystallize is system having co ordination number

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8

12

14

any one of above

The common oxidation state of elements of group V A is.

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-3

+3

+5

Any above

Which of the following acid radical give organic layer test.

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Cl-

CO3

I

S^2-

Which of the following statement is not correct regarding Lewis acids and bases.

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NH3 and H2O both behaves as Lewis bases

Substances which donate a pair of electrons are called Lewis bases

All Lewis bases are also Bronsted bases

Lewis base must contain an atom having less than an octet of electron.

Chemical and physical properties of metal nano particles of atoms were observed to change periodically depending upon

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Number of atoms in a particle

Shape of particle

type of organization

All of the above

The one in which the acceptor atom is of low positive charge, Large size and has several outer electrons which can be easily excited is a.

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Soft base

Hard Base

Soft acid

Hard acid

'A line, a point or a plane about which a symmetry operation is performed, is known as.

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Symmetry operation

Symmetry element

Reflection

Inversion

VBT is unable to explain the nature of some of the complexes of.

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Cobalt

Copper

Nickle

Manganese

In a system of designating wrought aluminum alloys a sour digit number is used what does the first digit indicate.

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The purity of aluminum

The identity of the alloy

The alloy group

All of above

The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.

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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.

The phenylamine molecule is too large to capture hydrogen ion easily

Phenylamine is much less soluble is water than is ammonia

The benzene ring has a tendency to increase the acidity of its substituents.

Smoke is a dispersion of

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Gas in gas

Gas in solid

Solid in gas

Liquid in gas

Which of the following reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

The Lambert beer law states that

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Transmission is directly proportional to path length

Transmission is directly proportional to concentration

Absorbance is inversely proportional to transmission

Absorbance is directly proportional to concentration.

The equilibrium constant value for a chemical reaction is 5 x 10²⁰which of the following statement is true with respect to this value.

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Reaction will be reversible

Reaction will proceed in backward direction

Reaction is at equilibrium

Reaction will proceed in the forward direction

Elements of group 14

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Exhibit oxidation state of -4

Exhibit oxidation state of +4

From M3+ and M4+ ions

Form M4- and M4+ iona

Which of the following statement is not true regarding Open Hearth process.

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No iron is lost

The process is economical and simple

Steel obtained is of high quality

Scrap iron cannot be used in this process.

Turpentine is obtained from._______________

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Oak tree

Pine tree

Birch tree

Lemon tree

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