Question # 1

The highest temperature at which a substance can exist as a liquid is called its:

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Critical temperature

Zero temperature

Absolute temperature

None of above

The substance added to the soil to provide one or more nutrient elements which are necessary plant growth are known as:

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Harmones

minerals

fertilizers

none of above

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

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water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

Covalent solids are composed of

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Ions

Different molecules

Neutral atoms

Diethyl ether

Which of the following acid is unsaturated carboxylie acid

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Malonic acid

Oxalic acid

Succinic acid

Maleic acid

The fertilizer contains 33___35%n is:

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ammonium nitrate

potassium nitrate

urea

ammonia

Major cause of SO2 on global scale is

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Volcanoes

Electric sparks

Combustion

All

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

A cell in which spontaneous redox reaction generates an electric current is called

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Electrolytic cell

Electrochemical cell

Voltaic or Galvanic cell

Biological cell

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

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Cathode rays are small sized particles

Cathode rays have same charge

Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases

Temperature of cathode rays higher

Which of the following salt is used as purgative

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CaSO₄

MgSO₄

BeSO₄

NaCl

High purity copper metal is obtained by

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Carbon reduction

Hydrogen reduction

Electrolytic reduction

Thermite reduction

95% ethanol is called:

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Rectified other

Diesel

Rectified spirit

Petrol

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

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1.661 x 10^{-27- Kg}

1.661 x 10^-24Kg

1.661 x 10^{-27- g}

1.661 x 10^-24mg

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Excitantion of an electron from 2s to 2p-orbital

Transfer of three electrons from B to the other atoms

Excitation of two electrons form 2s orbital to 2p orbital

Formation of molecular ion

Which reaction yields Bakelite?

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Urea with HCHO

Tetramethyl glycol with Hezamethylene diisocyanate

Phenol and HCHO

Ethylene glycol and Dimethylterephthalate

The reagents like KMnO_{4 and HCL cannot be filtered through Gooch crucible if its base is covered with :}

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Butterfly paper.

Ordinay paper.

Flying paper.

Filter paper.

A fibre which is made from acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

The oxide of beryllium is

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Acidic

Amphoteric

Superoxide

Basic

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