Question # 1

Which of the following brings about the conversion of starch into maltose?

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maltase

zymase

diastase

invertase

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH

The reagent and the condition used in this reaction may be:

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H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

Many petroleum products are:

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coloured

colourless

testy

poisoinous

Stalagmometer is used to measure

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the resistance to flow of a liquid

capillary action of a liquid

Meniscus of the liquid

surface tension of the liquid

Digestion of carbohydrates begins in the:

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large intestine

small intestine

duuoderium

beccal cavity/mouth

Water is essential for life on

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Moon

Space

Earth

Sun

Enzymes are chemically

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carbohydrates

proteins

fatty acids

phospholipids

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

Keeping in view the charge density select the compound amoung the following having highest lattic energy:

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LiBr

KCI

MgO

NaF

Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

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XY

X₂Y

X₂Y₃

XY₂

Sp³hybridization occurs when carbon is bound to

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Four other atoms

Three other atoms

Two other atoms

One other atoms

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

The polymers which can be re-softened again and again are caled

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Thermoplastic

Thermosetting

Both a and b

None

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

A combination of glucose and fructose is called:

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Sucrose

Table sugar

a and b

Lactose

In which reaction, aromatic aldehyde is treated with acid anhydride in the presence of corresponding salt of the acid to give unsaturated aromatic acid?

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Friedel-Crafts reaction

Perkin's reaction

Wurtz reaction

None of these

The molal elevation constant is the ratio of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solute

Mole fraction of solvent

A single chloride free radical can destroy bow many ozone molecules?

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100

100000

10000

10

Phenol is more readily soluble in

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Dil. HCl

Both NaOH and HCl

NaOH sol

Sodium bicarbonate solution

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