Question # 1

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

Which of the follwing dnes not give brick red precispitate wits Fehling's solution

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Acetaldehyde

Formalin

prorionaldehyde

Acetone

The process of coagulation can remove suspended solids in raw water about

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50%

60%

Less than 40%

More than 80%

Density of H₂gas at 0°C is 0.09 under 1 atmospheric pressure. The density of O₂gas under the same conditions of temperature and pressure is

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0.36

1.00

1.44

1.18

The smallest unit of a crystal that shows all the characteristic properties of its pattern is called

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cell

electrolyte

unit cell

crystal

Ethene can give all of the following reactions except

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Addition

Free radical substitution

Hydrohalogenation

Hydration

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

In crystal of sodium chloride, a Cl-1 ion present at the corner of cube is shared between how many cubes?

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8

4

6

10

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

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same as that of a hydrogen molecule

half that of a hydrogen molecule

two times that of a hydrogen molecule

four times that of hydrogen molecule

Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:

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2

4

6

8

The reactivity order of alkyl halides for a particular alkyl group is:

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F >Cl>Br>I

Cl>Br>F>l

l>Br>Cl>F

Br>l>Cl>F

The vapour pressure of two liquids 'p' and 'Q' are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

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140 torr

20 torr

68 torr

72 torr

Hydrolysis of alkyl nitriles is done to get carboxylic acids in the presence of

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Mineral acids

Mineral alkalies

Organics acids

Minerals acids & alkalies

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

Subsidiary quantum number specifies

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size of orbital

shape of orbital

orientations of orbitals

Nuclear stability

The spectrum of He is expected to be similar to that of

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H

Na

He⁺

Li⁺

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

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low ionization energy of sodium

sublimation of metallic sodium to give yellow vapour

emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region

photosenitivity

Which one is a nitrogen fertilizer

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Urea

Calcium sulphate

Potassium phospahte

Magnesium carbonate

Hydrolysis of protein by 6M HCl gives peptides and thenα-amino acids. How manyα-amino acids molecules are obtained on the hydrolysis of a tetrapeptide

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2

3

4

5

A beaker contains 9 grams of water. The number of H atoms is

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6.02 x 10²³

3.01 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

The boiling points of alcohols are higher than the corresponding alkanes, This is because

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Of hydrogen bonding existing between molecules of alcohols

Alkanes are dipolar compounds

Alcohols are sweet in taste

Alcohols are soluble in water

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