Question # 1

Which of the following orbitals has maximum penetration effect.

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s

p

d

f

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

Which of the following compounds is electrovalent in nature.

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SO2

ICI

KBr

CHI3

Which of the following is the weakest base.

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KOH

NaOH

LiOH

RbOH

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Which one of the following is not formed when an electric discharge passes through helium.

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HeH+

HeH2+

He2+

He2-

The correct order of increasing polar character is.

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H2O < NHE < H2S < HF

H2S < NH3 < H2O < HF

NHE < H2O < HF < H2O

HF < H2O < NH3 < H2S

A thionic acid

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H2S2O3

H2S2O6

H2S2O8

H2S2O7

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

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.

Which of the following iso -electronic ion would require least energy for the removal of electron.

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Ca2+

Cl-

Ar-

K+

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

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1

14

16

18

Fluorine finds considerble use of DDFT which is used as.

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herbicide

Fungacide

Insecticide

Nomatocides

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

The suffix "ate" at the end of the name of the compiled signifies that it is.

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Cation

Anion

Neutral

None of above

Used in filling luminous tubes.

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Xenon

Krypton

Radon

Helium

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

Which of the following is not an ore of iron.

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Haematite

Magnetite

Siderite

Monazite

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

Aluminium hydroxide is.

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An acid

An amphoteric hydroxide

A base

An explosive hydroexide

Used in Geiger counter to detect radioactivity

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He

Ne

Ar

Kr

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