Question # 1

ΔH° represent the enthalpy change at

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0°C and 1 atm pressure

25°Cand 1atm

0K and I atm pressure

25°C and 2 atm pressure

solubility of carboxylic acids decreases in water with increase in molar mass because

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Bigger molecules are more polar

bigger molecules have bigger non-polar groups

bigger molecules make more hydrogen bonds

bigger molecules can form lesser hydrogen bonds/molecule

Which is used as a coagulant:

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Ferric salts

Potash alum

a and b both

Chlorine

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

The forces which are present between the ions and the water molecules are known as

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

London dispersion forces

Select the name of ready plant from which word ''Paper'' is derived:

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sun flower

papyrus

water hyacinth

rose

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

General gas equation is combination of

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Boyle s law

Avogadro s law

Charles s law

All of these

A solid nitrate fertilizer reacts with an alkali to produce a gas which turns damp pH paper blue:

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NO₃

NHO₃

NH₂O

N₂H₄O₃

Which one of the following elements is not present in all proteins?

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carbon

hydrogen

nitrogen

sulphur

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

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Biochemistry

Physically chemistry

Pharmaceutical chemistry

Environmental chemistry

The quantitative relationship between the substances according to balanced equation describes

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Reversible reactions

Stoichiometry

Limiting reacting

Percentage composition

The covalent radius of Cl atom is:

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99.4 pm.

176.7 pm

38 pm

76 pm.

Which of the following salts mixed with ice to make the freezing mixture used in ice cream machine

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KNO₃

NH₄NO₃

AgNO₃

Mg(NO₃)₂

Which of the following compounds contains the highest percentage by mass of nitrogen?

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Ammonia, NH₃

Ammonium carbamate, NH₂CO₂NH₄

Ammonium carbonate, (NH₄)₂CO₃

Hydrazine, N₂H₄

Tincal is a mineral of:

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Al

B

Si

C

A transition element is defined as an element of 3d series

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Which is metal

Which has one stable ion

Which has two stable ions

Which has at least one stable ion with incomplete d-orbital

The ph of 10-3 mole dm-3 of an aqueous solution of H₂SO₄ is :

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3.0

2.7

2.0

1.5

The oxidation number of H is -1 in the compound

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H₂O

H₃BO₃

NaOH

NaH

Which of the following is the use of electrolysis?

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Eletrorefining

Electroplating

Both A and B

None of the above

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymers

Al is the most element in earth crust:

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O

Si

Al

Pb

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