Question # 1

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

Nitric acid has the property

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Nitrating

Reducing

Redoxing

None of above

In which pair of species, the Lewis formulae contain same number of ion pairs and bond pairs but they are not isoelectronic.

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O2, N2

SO2, O3

PCl3 , BF3

SOCl2, COCl3

Nitric acid is used in manufacturing of.

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Explosive

H2SO4

Fertilizer

All above

Which of the following is the weakest base.

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KOH

NaOH

LiOH

RbOH

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

The state of hybridization of carbon in CO2 is

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sp2

sp

sp3

dsp2

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 one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

Perdisulphuric acid is.

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Marshal acid

Caro acid

None of above

Any of above

Which of the following alloys contains Cu and Zn

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Bronze

Brass

Gun metal

Type metal

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

Mostly used solvents for ionic compounds.

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Liquid ammonia

Liquid SO2

Liquid HF

All above

Which of the following statement is incorrect.

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An alloy is a mixture of two or more metals

An alloy is a mixture of two or more metal and non metal elements that have metallic properties

An alloy has a fixed composition

An amalgam is an alloy containing Hg

Which of the following molecule does not contain the covalent bond between similar atoms.

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N2H4

F2O2

H2F2

H2O2

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

Which of the following is an allotrops of hydrogen.

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0- H2

P-H2

Both A and B

None of these

Hydrometallurgy of copper involves extraction of copper from poor ores by which process.

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Dry process

Wet process

Both dry and wet process

None of these

Most electronegative element is.

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C

Si

Pb

Sn

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