Question # 1

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Ozone gas has boiling point:

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Low

High

Medium

Highest

Surfactants are organic compounds used in detergents which reduce the:

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viscosity of water

surface tension of water

boiling points of water

surface ability of water

Which of the following is not a macromolecule?

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diamond

graphite

iodine

silica

betta-D-glucose is a monomer for

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Starch

Cellulose

Glycogen

Protein

Which of the following folymer is used as binder

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PVC

PVA

Acrylic resins

Polyester

Absolute zero, the lowest temperature on kelvin scale lies at

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-273°C

273°

-100°C

100°C

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

The bonds present in the primary structure of proteins are by

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Dialysis

Electrophoresis

Filtration

Alcohol precipitation

Substances that tend to decrease the activity of enzymes are called

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coenzyme

activators

inhibitors

apoenzyme

Organic compounds generally react at ______ rates

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Slow

Fast

Moderate

None of them

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Introduction of an inert gas at constant volume

Introduction of PCl₃(g) at constant

Introduction of PCl₅(g) at constant volume

Introduction of Cl₂at constant volume

Alkyl halides react with Mg in dry ether to form

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Magnesium halide

Grignard's reagent

Alkene

Alkyne

Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is

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C₃H₄O₃

C₂H₄O₃

C₃H₅O₄

C₂H₃O₁

Their e/m, ratio resembles with that of electrons

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Alpha rays

Beta rays

Gamma rays

X-rays

Which is a protein?

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Nylon

Rayon

Natural silk

Terylene

The cement plants in west Pakistan at the time of creation were:

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Ten

Twenty

Four

Twenty four

Formaldehyde is used to make

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Plastics

Medicine

Antiseptic

All of these

17.1 grams sucrose (C₁₂H₂₂O₁₁) dissolved in 250 cm³of solution. This has molarity

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0.1 M

0.2 M

0.01 M

0.02 M

Lithium reacts with air to form

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Peroxide

Normal oxide

Superoxide

None of these

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

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