Question # 1

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Which element is expected to show the greatest tendency to form some covalent compounds?

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aluminium

calcium

magnesium

sodium

The alkaline earth metals are called so because they

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form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

Which of the following does not contribute towards the formation of photochemical smog?

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NO

SO₂

O₃

Hydrocarbons

Terylen fibre is made by reaction of terephthalic acid with

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ethylene

ethylene glycol

glycol

terylene

The boding which covalent molecules containing hydrogen and one of the small electronegative element such as O, For Mis called:

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ionic bonding

bridge bonding

H-bonding

metalic bonding

According to Hess's law, the enthalpy change for a reaction

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Depends on path

Independent of the path

The sum of ∆E and ∆H

None of these

Activity of the enzyme is reduced by

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temperature

concentration

pH

inhibitors

Amino acids are bifunctional organic compounds what are the two function groups

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Carboxylic acid and alcohol

Acohol and aldehyde

Carboxylic acids and ketone

Amino group and carboxylic acid

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

Lithosphere has amount of silicon:

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35.30%

27.72%

40.01%

21.13%

Easter are pleasant smelling compounds. Which ester posseses odour like pineapple

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Amylacetate

Amylbutyrate

Ethylbutyrate

Benzylacetate

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

Ethylene can be prepared in the laboratory by heating together ethyl alcohol and

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HCI

Phenol

HF

H₂SO₄

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

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O₂gas

H₂gas

Na metal

Na₂O

Which if the following has the highest freezing point at one atmosphere

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0.1 M NaCI

0.1 M sugar solution

0.1 M BaCI₂

0.1 M FeCI₂solution

Two moles of acetic acid are heated with P₂O₅the product formed is

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2 moles of ethyl alcohol

Formic anhydride

Acetic anhydride

2 moles of methyl cyanide

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

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Gas molecules collide with anode

Gas molecules are at high temperature

Gas molecules produce X-rays

Cathode rays remove electrons from gas molecules

Coordination sphere may be:

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Cationic

Anionic

Neutral

All above

Fluted filter paper is used to :

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Decrease rate of filtration.

Increase rate of filtration.

Maintain rate of filtration.

None of above.

Benzene hexachloride is used as

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Dye

Antimaterial drug

Antibiotic

Insecticide

The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is

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N

Li

P

Na

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