Question # 1

Which element protects teeth from decay?

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Potassium

Fluorine

Sodium

Calcium

Vitamin B₁ (Thiamin) was discovered by.

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Hopkins

Funk

J.Watson

Davy

Crude oil is heated to the fractionating furnace upto.

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300 ^oC

350^oC

400^oC

450^oC

Which of the following is reducing sugar?

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Glucose

Maltose

Sucrose

Starch

A complete reaction is one is which.

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All the reactants convert into products.

All the reactants do not convert into products.

Half reactants convert into products.

Only 10% reactants convert into products.

Halogenation of methane produces following valuable chemical compounds used as solvents except.

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Carbonterachloride

Chloroform

Carbon Black

Chloromethane

Water molecule show structure.

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Tetrahedral

Trigonal

Pentagonal

All of them

Dehydration of alcohols can be carried out with.

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NaOH

KOH

H₂SO₄

HCl

Deficiency of Vitamin E causes.

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rickets

Scurvy

Anemia in babies

Night blindness.

Arrhenius put forward acid base concept in.

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1878

1786

1787

1790

99% of atmosphere consists of .

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N₂and H₂

N₂and O₂

N₂and CO₂

O₂and CO₂

When acid reacts with sulphites and Bi sulphates which gas is evolved?

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H2

CO₂

SO₂

NH₃

Methyl orange produces which colour in basic solution

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Red

Yellow

Pink

White

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