Question # 1

Ionic crystals are brittle because

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they have cubic geometry

they are bad conductors of electricity

coordination number of cations and anions is same

cations and anions are arranged in alternate positions in layers

The minimum temperature recorded by Kelvin scale is:

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273K

373K

Absolute scale is unable

0K to record this temperature

The partial pressure of gas can be calculated if we know total pressure of mixture and:

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Number of protons

Number of electrons

Number of neutrons

Mole fraction of gases

Select the name of ready plant from which word ''Paper'' is derived:

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sun flower

papyrus

water hyacinth

rose

A polymeric substance that is formed in the liquid state and then hardened to a liquid solid us called as:

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Fibre

Plastic

Varnish

Polyamide resin

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

coordination number of N^a+ in NaC is:

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1

2

4

6

An oil of fat with no double bond have iodine number:

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Zero

100%

50%

Minimum

Which of the following undergoes easy dehydration?

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3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

Which one is best buffer those have

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pH = pKa

pH > pKa

pOH < pKb

pKa =0

Corrundam is ore of which element?

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Al

Th

In

Mg

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

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3

2

1

0

Best way to prevent rusting of iron is by

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Making iron cathode

Putting it in saline water

Both of these

None of these

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

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Mercury

Lead

Nitrogen oxide

Sulphuric oxide

Elements combine together due to inherent tendency to stabilize themselves by:

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Losing electron.

Sharing electrons.

Gain in electrons.

All of above.

Which of the following compounds gives trichoromethane on distilling with bleaching power?

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Methanal

Phenol

Ethanol

methanol

Which of the following reagents is used to distinguish acetone and acetophenone

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NaHSO₃

Grinard reagent

Na₂SO₄

NH₄Cl

Propyne on hydrolysis in presence of H₂SO₄and HgSO₄gives

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Acetaldehyde

Acetone

Formaldehyde

None

The negatively charged particles are called

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Cation

Radical

Anion

Positron

When an electron is added to a uni positive ion we get:

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Cation

Molecule

Neutral atom

Anion

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Moles per dm³

Partial pressures

Number of moles

Mole fractions

Gooch crucible is made of:

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Brass

Porcelain

Bronze

.Gold

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