Question # 1

The acetylene molecule contain a

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Single bond

Double bond

Triple bond

Co ordinate bond

The noble gases are found in the atmosphere to the extent of about some percent by volume.

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0.5%

1.0%

1.5%

2.0%

Metallic bond is treated essentially as in character

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Ionic

Covalent

Polar

Non polar

Which one of the following sets of elements has the strongest tendency to form negative ions in gaseous state.

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NA, Mg, Al

Ca, V, Cr

N , O, F

Ga, ln, tI

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

Which one of following is non polar

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CH2Cl2

CCl4

CHCl3

CH3Cl

How many sigma and pi bonds are there in a CO2 molecule.

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2 sigma

2 sigma and 4 pi

2 sigma and 2 pi

4 sigma and no pi

All the halogen form oxyacide, except

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Florine

Chlorine

Bromine

Iodine

Copper is mainly extracted from witch of the following ore

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Sulphide ores

Carbonate ores

Oxides ores

Non sulphide ores

Which halide of cesium will be highly ionic in nature.

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K+

Ag+

Rb+

Ca+

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

The pH of the tears is

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7.0

7.4

7.8

8.2

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

Which of the following is an alloy of copper

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Brass

Bronze

Monel metal

All

Aluminum is usually extracted from

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Bauxite

Corundum

Feldepar

Alumite

Glass electrode cannot be used to measure the pH of pure.

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Acetic acid

Ethyl alcohol

Gelatin

All above

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

Group VII A of periodic table consist of elements.

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4

5

6

7

CCl4 has zero dipole moment because of.

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Planar structure

Tetrahedral structure

Similar size of C and Cl atoms

Similar electrons affinity of C and Cl

Among group IA elements, melting point

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Increases down the group

Decreases down the group

Do not show any regular trend

Remains constant

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