Question # 1

Which is the second most abundant element occurring the earth crust.

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Iron

Cu

Cr

Ni

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

The different layers in graphite are held together by

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Ionic bonding

Metallic bonding

Covalent bonding

Van der Waals forces

Co ordinate compounds are

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Polar

Non polar

Dem polar

None of above

The number of formula weight of the solute dissolved per dm3 of the solution is called.

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Mole fraction

Normality

Formality

Molaiity

The formula of Bauxite is.

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Al2O3

Al2 O3. 2H2O

AL2O3, H2O

Na3AIF6

Which substances is not used as an additive in paper industry.

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Glucose

Starch

Alum

None of these

Flourine differs from the other members of its own group due to.

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Its small size and low bond energy

Its higher electornegativity

None-availability of d-orbitals in its valence shell

All the above

The correct order of electron affinities of SI, P, and Cl is.

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P > Si > Cl

Cl > P > Si

Cl > Si, > P

Si > P . Cl

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

Ionic reactions mainly take place in.

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Aqueous solutions and organic solvents of high polarity

Non aqueous solvents of low polarity

Gaseous state

Solid state

Alumina is not used as

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Refractory material

A medium in chromatography

An abrasive

A White pigment

The total number of bond pairs around sulphur and total number of lone pairs around oxygen atoms in the Lewis structure of sulphate ion are respectively.

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4, 12

8,12

12,4

6 ,12

A group that causes deepning of the colour is known as

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Bathchromic

Hypsochromic

Hypochromic

Hyperchromic

In which of the following techniques the solvated molecules are separated according to their size by their ability to penetrate a sieve like structure.

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Adsorption chromatography

Partition chromatography

Ion exchange chromatography

Gel permeation chromatography

Which idea of envisioned the construction of nano robots

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Building nano materials atom by atom

Destruction of macromolecules to nano ones

Bothe of the above

None of the above

Citral when heated with KHSO4 forms.

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Isoprene

p-cymene

p-menthane

Dipentene

Which of the following represents the correct order of ionic radii

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La+ < Na+ < K+ < Rb+

Li+ > Na + > K+ >Rb+

Li = Na + = K+ = Rb+

Rb +> Na+> K+ > Li+

If the absorbed light is green the transmitted light will be

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Purple

Orange

Violet

Black

Among the solvents given below, with dielectric constant (E) given in parentheses which has highest solubility of KCI?

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Benzene (E=O)

Carbon disulphide (E = O)

Methanol (E =32)

Acetone (E = 2)

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

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

The most convenient and has nearest approach to a universal pH measurement

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pH strips

pH indicator

The emf method

The colorimetric

Which of the following has the highest melting point.

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NaCl

KCl

MgO

BaO

In the Aluminothermite process, aluminium acts as.

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An oxidizing agent

A reducing agent

A flux

A Solder

Which element out of the following can exhibit a maximum co valency of seven.

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Chlorine

Fluorine

Sulphur

Both Cl and F

Usually the rate of the reactions is expressed as.

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mol dm-1

mol dm-3 s-1

mol dm-2 s-1

mol 2 dm-3 s-1

Molten iron withdrawn from the blast furnace is called.

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Wrought iron

Pig iron

Bessemer iron

Stainless steel

Which of the following configuration is associated with biggest jump between second and third IE.

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1s2, 2s2, 2p2

1s2, 2s2, 2p6, 3s1

1s2,2s2,2p6, 3s2

1s2, 2s2,2p6

Metallic magnesium is obtained by

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Reduction of MgO with Coke

Electrolysis of an aqueous solution of MgCl2

Electrolysis of molten MgCl2

Displacement of magnesium by iron form MgCl2 solution.

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