Question # 1

Formalin is a 40% solution of

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CH₃CHO

CH₃OH

HCHO

CH₃OCH

Usually the percentage of moisture is paper is

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1- 3%

4-6%

6-8%

5%

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

------------------- is not a nucleophile

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H₂O

NO₃

BF₃

NH₃

Which one the following a dihydric alcohol

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Ethanol

Cyclo hexanol

Glycerol

Glycol

Which enzyme is not involved in fermentation of starch.

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Diastase

Zymase

Urease

Invertase

Kaolin is a mineral of

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Carbon

Magnesium

Silicon

Aluminium

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

The mean residence time of methane in atmosphere in

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1-2 years

3-4 years

3-5 years

3-7 years

Out of the elements of group VA, the highest energy is possessed by

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N

P

Sb

Bi

Methyl alcohol can be distinguished from ethyl alcohol by

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Action of Cl2

Action of NH3

Dissolving in H2O

NaOH +I2

Which carbohydrate can be used for silvering of mirror.

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Glucose

Fructose

Maltose

All

--------------- element forms an ion with charge 3⁺

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Beryllium

Aluminium

Carbon

Silicon

In which hybridization bond angle is maximum

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sp3

sp2

sp

sp3 and sp have same angles

------------- metal is used in the Thermite process because of its reactivity

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Tron

Copper

Aluminium

Zinc

Which complex shows zero oxidation state of the transition metal.

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[Fe(CO)5]

K3[Fe(CN)6]

K2[Fe(CN)6]

[Cu(NH3)4]SO4

Which substance is used for denaturing of ethanol

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Methanol

Acetone

Pyridine

All

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