Question # 1

Which of the following process is involved in the purification of crude metals.

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Liquation process

Oxidation process

Distillation process

Electro refining

The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is.

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5s1, 4d5

6s1, 5d5

6s1, 5d6

6s1, 5d4

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4

Which is the purest form of iron.

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Pig iron

Cast iron

Wrought iron

Steel

Suppose the activatin energy of a certain reaction is 250 kj/mol, If the rate constant at T1 =300 K is k1 and the rate constant at T2= 320 K is ks, then the reaction is ______ times faster at 320 K than at 300 K

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3 x 10^-29

0.067

525

15.0

Which of the following ions does not have the electronic configuration same as that of neon.

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F-

O2-

Na+

Ca2+

The volume of a given mass of gas at constant temperature varies inversely with the pressure. This is a statement of.

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Charlea's law

Avogadro's law

Boyle's law

Dalton 's law

The pH of milk is

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6.0

6.5

7.0

7.5

Which of the following is diamagnetic

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O2

O2+

O2-

O2 ^2-

Which type of the solids are generally good conductors of electricty.

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Covalent

Ionic

Metallic

Molecular

When fullerencs were discovered they were thought to be

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First example of spherical aromatic molecule

First example of spherical non aromatic molecule

First example of diamond lime molecule

None of the above

Which of the following statement is not correct regarding galvanic cells.

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Oxidation occurs at the anode

Ions carry current inside the cell

Electrons flow around the external circuit. form cathode to anode

When the e.m.f. of the cell is positive cell reactionis spontaneous

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

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

Inter halogens are of types.

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3

4

5

6

A colloidal system in which both the dispersion phase and dispersed phase are liquid is.

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Smoke

Emulsion

Whipped cream

Mist

Which of the following orbitals does not make sense.

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6f

4f

7s

2d

Which of the following cells is used to produce electricity from chemical reaction

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Electroytic cell

Galvanic cell

Voltaic cell

Fuel cell

Both C and D

Which of the following should have the largest dipole moment.

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Carbon tetrachloride

Cis-stibeue

Trans-atibeue

Cis-dichlorocthylene

Pi bond is formed

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By the overlapping of atomic orbitals on internuclear axis

By transference of electrons

By sidewise overlapping to half filled p orbitals

By overlapping of s-orbitals with p orbitals

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

The overall energy change during the Cannot cycle to.

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Equal to zero

Equal to Q

Equal to W

Maximum

The oxidation state of HCiO4

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+ 7

+ 3

+ 5

+ 1

Transition metal possess

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Definite color

Catalytic power

Both A and B

None of above

The correct order of increasing polar character is.

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H2O < NHE < H2S < HF

H2S < NH3 < H2O < HF

NHE < H2O < HF < H2O

HF < H2O < NH3 < H2S

Which of the following statements not correct with the concept of Bronsted concept of acids and bases.

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An acid can donate a proton

A base can accept a proton

This concept has many bases that have OH- ions

This concept is more general

The velocity possessed by maximum fraction of molecules at a given temperature is called.

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Average velocity

Root mean aquare velocity

Most probable velocity

None of the above

[Ti(OH2)6]3+ gives colour

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Green

Red

Purple

Blue

Which of the following reactions have small enthalpy change.

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NaOH with HCl

NaOH with CH3 COOH

HCl with NH4 OH

None of these

Proper proportioning of concrete, ensures

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Resistance to water

Desired durability

Water tightens of the structure.

All

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