Question # 1

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

Nitric acid is used in manufacturing of.

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Explosive

H2SO4

Fertilizer

All above

Which of the following process is involved in the purification of crude metals.

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Liquation process

Oxidation process

Distillation process

Electro refining

Which of the following parameter is not involved in calculations based on Born Haber Cycle.

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Ionization enthalpy

Electron gain enthalpy

Electronegativity

Bond dissociation energy

Is a peroxy acid

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H2SO5

H2S2O6

H2SO4

H2S2O7

The rising world temperature will have serious effect on.

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Agriculture

Animal production

Human being

All above

Metal are generally elements

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Electronegative

Electropositive

Neutral

None of the above

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

The electron gain enthalpy of chlorine is -349 Kj mol-1 ionization energy of Cl would be.

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-349 kJ mol -1

349 kJ mol-1

-698 kJ mol-1

698 kJ mol-1

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

Which one of the following does not exhibit paramegnetion.

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NO

NO2

CiO2

CIO-2

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.

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

Elements in which differentiating electron enters the (n-1) the d-orbitals of the (n-1) the main shell are called elements.

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s- block

p-block

d-block

f-block

Which of the following statements is worng.

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Covalent compounds are generally soluble is polar solvents

Covalent compounds have low melting and boiling point.

Ionic solids do not conduct electricity is solid state

Ionic compounds conduct electricity in the fused state.

Which of the following elements has the highest density.

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Mg

Na

K

Rb

BCl3 is a planar molecule because B atom is.

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sp2 hybridized

Sp3 hybridized

sp hybridzed

sp3 d hybridized

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

Lother Meyer plotted a graph showing variation of.

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Atomic volume with increase in atomic number

Atomic volume with increase in atomic weight

Atomic redii with increase in atomic weight.

Atomic weight which increase in atomic number

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

Which of the following have +3 oxidation states.

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B & AI

In & TI

B & In

AI & TI

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