Question # 1

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

Soapy detergents and soapless detergents behave differently in hard water because they

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Have different hydrophilic heads

Have different hydrophobic hydrocarbon chains

Have different pH values

Above A and C both

Which of the following statements is incorrect.

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The elements of group 18 are known as aerogens.

Group 2 elements are all metals

Metallic character increase on going down a group

All the elements belonging to a particular period have same valence shell configuration.

Which of the following techniques does not belong to column chromatographyy

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TLC

HPLC

Electrophoresis

Ion exchange

Bromine is soluble in

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Alcohol

Water

Chloroform

All above

Water is often treated with chlorine to

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Increases oxygen content

Kill germs

Cause sedimentation

Remove insoluble impurities.

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

Variable oxidation states is shown by

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Normal eleemnts

Metallic elements

Non metallic elements

Transition elements

In proper rotation (Cn) an object is rotated through an angle of.

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a/n radians

2n/n radians

3n/n radians

4n/n radians

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

Which of the following is not a ligand or complexing agent.

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NH3

CH3COOH

EDTA

CN-

Separation of isotopes of uranium is carried out by

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CaF2

SF6

HF

All above

Since the acid gives both acidic and normal salts so the acid is.

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di acid

di basic

double salt

Any of above

The common temperature detecting device in DTA are.

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Thermocouples

Thermopiles

Thermistore

All

Which of the following statement is not related with nitric oxide.

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It is a colorless and odourless gas

It is produced largely by fuel combustion

It is a brown pungent gas

It is oxidized to NO2

Which of the following statement is not correct regarding the constant R . and in ideal gas equation PV= nRT

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Its value in independent of temperature

Its value is independent of pressure

In SI Units its value is 8.314 K^-1 mol^-1

It is called the universal gas constant per molecule.

For covalent bond to form between two atoms A and B

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Transference of electrons must take place from A to B

A pair of electrons of A is shared by both A and B

A and B contribute equal no. of electrons for mutual sharing by A and B

One of the atom A or B must already have octet of electrons.

Which of the following is not a naturally occurring dye.

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Indogo

Indigotin

Alizarin

Malachite green

The major role of Flurospar which is added in small quantities in the electrolytic reduction alumina dissolved in fused cryolite is.

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As a catalyst

To make the fused mixture very conducting

To lower the temperature of the melt

To decreases the rate of oxidation of carbon at the anode

Which of the following compounds does not show dipole moment.

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CH3OH

HBr

CCl4

CHCl3

The type of bonding in HCl is

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Pure covalent

Polar covalent

Highly polar

Hydrogen bonding

The state of hybridization of Xe in Xe F6 are

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sp2

sp3

sp3 d

dsp3

A pH of a neutral solution at 100 ^oC when Kw = 1.0 x 10^-12

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0

7

6

7

The carbonate of which of the following will have highest lattice energy.

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Barium

Magnesium

Calcium

Strontium

Each of the following when present at para position decreases the acidic strength of phenol except.

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-NH2

-Cl

CH3O-

CH3-

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

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Molality

Formality

Normality

Molarity

Group VA of the periodic table consist of elements.

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3

4

5

6

Sodium Tetra borate is used

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As alkaline buffer in dying & bleaching process

In manufacture of opticl glass

in enameling and making glaze

All above

Which of the following technique is based on the absorption of light radiation.

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Spectrophotomerty

Colorimetry

NMR

All the above technique

Which of the following radical is not a member of IV group.

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

Considering the elements B, Al, Mg and K , the correct order of their metallic character is.

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B > Al > Mg > K

Al > Mg > B > K

Mg > Al > K > B

K > Mg > Al > B

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