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

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

Commercial or the phosphoric acid is pure.

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37.0%

82.98%

88.25%

90.12%

The pH Value 4.2 is of

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Vinegar

Lemons

Oranges

Tomatoes

Which of the following is the most abundant alkaline earth metal.

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Be

Mg

Ca

Sr

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

Boric acid is added to glass because is.

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Makes the glass opalescent

Reduces the coefficient of expansion

Makes the glass brittle

Increase refractive index of the glass.

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

In vinyl cyanide, the number of a bonds in

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2

3

1

4

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

Pauling has suggested that the calculate of energy can be improved by considering.

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Screening effect

Polarization effect

Both A and B

None of abvoe

The element having highest ionization energy and least electron affinity belong to

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Period 1 , group 18

Period 2, group 17

Period 2, group 1

Period 2, group 2

Which of the following proportion is associated with the covalent nature of the compound.

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It conducts electricity in molten stater or aqueous state

It is a non electrolyte

It has high m.p.

It is a compound of a metal and non metal.

Which of the following is a pseudohalide.

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I3-

IF7

CN-

ICI

Among the elements A,B,C and D having atomic numbers 9,10,11, and 12 respectively, the correct order of ionization energies is.

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A > B > C >D

B > A > D > C

B > A > C > D

D > C > B > A

Electron gas theory is able to explain

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Metallic lusture and optical properties

Malleability and ductility

High electrical and thermal conductivity

All of the above

Which of the following is most soluble in water

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CaSO4

Sr SO4

MgSO4

BaSO4

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