Question # 1

Solvent extraction method is particularly useful technique for separation when the product to be separated is

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Non-volatile or thermally unstable

Volatile or thermally unstable

Non-volatile or thermally stable

Volatile or unstable

Mass of 22.4 dm3 of N2 at STP is.

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28 gm

14 gm

1.4 gm

2,8 gm

A filtration process could be very time consuming if it were not aided by a gentle suction, which is developed

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If the paper covers the funnel up to its circumference

If the paper has got small sized pores in it

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

One of the following substances does not undergo sublimation

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KMnO₄

Naphthalene

NH₄CI

Iodine

10 g of NaOH has been dissolved per dm3 of solution. The molarity of solution is.

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0.5 M

0.25 M

1 M

2 M

When 6d orbital is complete, the entering electron goes into.

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7f

7s

7p

7d

How many sigma and pi bonds are present in C2H2.

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one sigma and two pi

two pi and one sigma

Two pi and three sigma

Three pi and two sigma

Which statement is incorrect about 64 g of SO2.

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It is one mole SO2

The number of SO2 molecule are 6.02 x 10²³

The number of oxygen atoms are 6.02 x 10²³

The number sulphur atom are 6.02 x 10²³

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

Which technique is used ot determine the absorption of radiations.

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Spectrometry

dilatometer method

Refractometric method

Optical rotation method

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

Which statement about a molecule is incorrect.

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It exist independently

Molecules of a substances are similar

Hemoglobin is a homoatomic molecules

Oxygen molecule is a macromolecule

One molecule of hemoglobin in heavier than one atom of hydrogen.

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680 times

6800 times

68000 times

680000 times

If strip of Cu metal is placed in the solution of FeSO4

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Cu will be precipitated out

Fe is precipitated out

Cu and Fe both dissolves

No reaction takes place

Chromatography in which stationary phase is a solid is called.

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Partition chromatography

Paper chromatography

High pressure liquid chromatography

Adsorption chromatography

10 g of NaOH have been dissolved per kg of solvent The molality of solution.

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0.25 m

0.5 m

1.0 m

2.0 m

When an atom reacts chemically and loses one or more electrons it is.

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Decomposed

Reduced

Oxidized

Catalyzed

Acetone and chloroform are soluble in each other due to.

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Intermolecular hydrogen bonding

Dipole dipole interaction

Instantaneous dipoles

All of the above

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