Question # 1

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

The enzyme which is found in saliva, accelerates the conversion of starch into sugar is

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Pepsin

Thrombin

Ptyalin

Fumarase

Which does not affect vapour pressure

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Nature of liquid

intermolecular forces

Temp

None of these

The number of Na+, ions which surround each Cl- ion in the NaCl crystal lattice is

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8

12

6

10

Absolute zero, the lowest temperature on kelvin scale lies at

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-273°C

273°

-100°C

100°C

The volume of gas depends upon the ______ molecules

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Size of

Molecular weight

Space between

Both a and b

Helical structure of protein is stabilized by

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Peptide bond

Dipeptide bond

Van der wall's forces

Hydrogen bonding

Ozone layer is

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25 - 28 km high

26 - 29 km high

24 - 27 km high

20 - 28 km high

Smell of cooking gas during leakage from gas cylinder is detected because of the property of:

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Effusion

Evapotration

Diffusion

Conduction

AgNO₃ is a polymorphic having two different crystalline forms which are

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cubic, tetragonal

monoclinic, hexagonal

cubic, orthorhombic

orthorhombic, rhombohedral

The main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

The conversion of tertiary alcohols into alkenes in the presence of K2Cr2O7 + H2SO4 is

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Addition reaction

C-H bond cleavage

Elimination reaction

Combustion reaction

The instrument that is used to measure the pressure of a gas is called

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viscometer

photometer

barometer

stalagmometer

Silk is the example of:

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mineral fiber

vegetable fiber

animal fiber

none of above

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

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

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Electric field

Magnetic field

Incident light

X-rays

Dehydration of allcohol gives:

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Alkane

Alkene

Aldehyde

ketone

In Lucas test primary alcohol make as oily layer

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Immediately

In 10 mins

On heating

Not

The order of reactivity of halogen acids towards alkenes

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HCl > HBr > Hl

HBr > HCl > HI

HCl > HBr

HI > HBr > HCl

A nucleophilic reagent will readily Attack

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Ethylene

Ethanal

Ethanol

Ethylamine

Electronic configuration of Cu⁺²is

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4S², 3d⁹

4s^-1, 3d¹⁰

4S⁰, 3d⁹

None of these

Boric acid cannot be used:

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An antiseptic in medicine

For washing eyes

In soda bottles

For enamels and glazes

Solvay process is used in the manufacture of

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Na₂CO₃

NaHCO₃

CaCl₂

All

Which one of the following reaction takes place spontaneously

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Natural rubber is a polymer of

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Butadiene

Ethyne

Styrene

Isoprene

The word paper is derived from the name of which reedy plany

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Rose

Sun flower

Papyrus

Water hyacinth

Which of the followingα-Amino acids has basic R-group

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Proline

Glutamic acid

Histidine

Valine

Each molecule of haemoglobin is 68000 times heavier than one atom of

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C

H

N

O

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