Question # 1

Mark the icorrect statement about ionization energy.

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It is measured in kJmol-1

It is absorption of energy

It decreased in a period

It decrese in a group

A state of matter whose properties are between those of liqids and crystalline solids.

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Plasma

dark matter

Liquid crystal

Supercriticl fluid

Stochiometric calculators are used to prepare.

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Soaps

Shampo

Perfumes

All of these

Number of neurtons in ²⁷M₁₃are

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13

14

27

15

Whcih acid is present in our stomach.

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Nitirc Acid

Hydrochloric acid

Sulphuric acid

All of the above

Bond dissocialation for H2 is

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435 kJ/mol

440 kJ/mol

430 kJ/mol

445 kJ/mol

Acid rain has pH less than.

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6

7

7.4

5.6

Activation energy of a chemical reaction must be....... the everage kinetic energy of reacting molecules.

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Equal to

Grether than

Lower than

None of these

In metals, the hold of nucieus over the valence shell elecrons is veak due to.

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Highlectron affinity

Large sized atoms

High ionization energies

All of the above

According to Arrhenius concept base is a substance which dissociates in aqueios solution to give

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Hydroxide ions

Hydrogen ions

Pair of Electrons

Proton

What information was obtained fom discharge tube expriments?

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Electrons and protons were discovered

Structur eof atom was discovered

Neutrons and protons were discovered

Presence of nucleus in an atom was discovered

Water dissolves Non-ionic compounds by:

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Ion-Ion forces

Dipole forces

Dipole - Dipole forces

Hydrogen Bonding

Building and Monuments lose their beauty and shine due to

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U.V radiations

Chlorofluoro carbons

Acid rain

IR radiations.

A conjugate base is a specie formed by donating a.

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Proton

Electron pair

Neutron

Electron

Such reactions which continue in both directions are called.

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Irreversible

Reversible

Nonreactive

Dynamic

The acid which is called king of chemicals.

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Sulphuric Acid

Nitric Acid

Hydrochloric acid

Acetic acid

Water is a;

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strong electrolyte

non-electrolyte

weak electrolyte

natural compound

How many % age of nitrogen present in air by volume?

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70%

75%

78%

80%

Swimming pools are cleaned by a process:

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Hydrogenation

Bromination

Chlorination

Nitration

A conjugate acid is a specie formed by accepting a.

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Proton

Electron pair

Neutron

Electron

Acetic acid is a weak acid because it.

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Is used in cooking and flavouring food.

Has very low pH

Is not fully ionized

Does not contain any hydrogen ions.

General formula of alkyl radical is

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C_nH_2n+2

C_nH_2n-2

C_nH_2n+1

C_nH_2n

The repulsion of electronic clouds of the molecules are responsible for the attractive forces among the molecules. These forces are

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Dipole-induced dipole forces

Ion-dipole forces

Instantaneous dipole-induced dipole forces

Dipole-dipole forces

How many moles of AgCI are produced by combination of 1.0 mole of AgNO₃and 2.0 mole of NaCI

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1.0

2.0

3.0

4.0

Optimum pressure in Haber's process for synthesis of Ammonia is

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100 -150 atm

200- 300 atm

350 - 450 atm

500 - 600 atm

The number of bonds in oxygen molecules.

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One sigma and One pi

One sigma and two Pi

Three sigma only

Two sig and two pi

Catalyst used in preparation of NH3 from N2 and H2 is.

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Ni

Fe

Pt

V2O5

The vapour pressure of an aqueous solution of glucose is.

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Equal to vapour pressure of water

Independent of temperature

More than vapour pressure of pure water

Less than vapour pressure of pure water

Which of the hydrogen halide has the highest percentage of ionic character.

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HCl

HBr

HF

HI

Safe and reliable method of drying crystals is through.

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Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

Which element has highest ionization potential

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Li

Na

K

Rb

What amount of NaOH is required to prepare 500 g of 0.5 molal solution.

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10 g

20 g

30 g

40 g

Unit of mole fraction is

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mol dm-3

mol kg-1

g dm-3

No unit

The fiber which is made from acrylonitrile as monomer

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PVC

Polyester fiber

Rayon fiber

Acrylic fiber

Which element reacts with alkali and H2 gas is produced.

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Be

Mg

Ca

Sr

Which one of the following polymers has no peptide linkage in it.

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Terlene

Nylon -6,6

Protein

None of these

Plastics are pollution problem because many plastics

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are made from petroleum

are very inflammable

burn to produce toxic fumes

decompose to produce toxic products

Which metal is redered passive by HNO₃due to formation of a film of metal oxide over the metal

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Pt

Sn

CO

Mn

Which compound shows hydrogen bonding.

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C2H6

C2H5Cl

CH3-O-CH3

C2H5OH

Which substance is used to convert alcohol to alkyl halide.

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SOCl2

PCl3

HCl +ZnCl2

All of these

Oxime is an addition product obtained when aldehydes react with.

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HCN

NH2OH

Phenyl hydrazine

H2O

The percentage of carbon is different types of iron products is in the order of.

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Cast iron > wrought iron > Steel

Wrought iron >Steel >Cast iron

Cast iron > Steel > Wrought iron

A caboxylic acid contains

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a hydroxyl group

a caboxyl group

a hydroxyl and carboxyl group

a carboxyl and an aldehyde group

In which group, melting point and boiling point increase downward in a group

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IA

II A

VII A

Both a and b