Question # 1

The concentration of OH- ions in a certain household ammonia solution is 0.0025. This ammonia solution is.

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Basic

Acidic

Neutral

None of above

In whihc period, the element with least ionization enthalpy belong to

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Group I

Group 2

Group 17

Group 18

Atomicity of which of the following pair of elements is not same as hydrogen.

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Phosphorus, Nitrogen

Nitrogen, Argon

Nitrogen, iodine

Iodine, sulphur

Which of the following process is not sorbent separation technolgy.

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Penex

Parex

Molex

Olex

Which of the following techniques is bulk technique.

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Powder XRD

Single Crystal XRD

SEM

TEM

Identify the incorrect statement regarding crystallization from the following.

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It is an important procedure for purifying solids

The impurities are removed by filtering the solution

Crystals are separated by filtration

In crystallization method, the solid is dissolved in a solvvent in which it is soluble at all temperature.

CFT was originally applied to.

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Ionic crystal

Liquid crystal

Solid crystal

All above

Turpentine is obtained from._______________

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Oak tree

Pine tree

Birch tree

Lemon tree

Of the following the commonly used n the laboratory desiccator is.

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Anhyd. Na2Co3

Anhyd Ca Cl2

Dry NaCl

None of the above

Which name is associated with the rules which help in predicting the portability of anion.

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Soddy

Slater

Fajan

Linus pauling

The capacity of normal human eye to see the smallest object is _______ micro meter

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10000

1000

100

10

Give violet colour to flame

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Gallium

indium

Thallium

Aluminium

A correct reaction mechanism for a given reaction usually is.

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The same as the balanced chemical equation

Obvious if its heat of reaction is known

Sometimes difficult to prove

Obvious if the activation energy is known

Which of the following radical is not a member of II group.

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Cu²⁺

Cd²⁺

Ba³⁺

K+

Which of the following alkyl halide undergoes nucleophilic substitution reaction via the formation of a carboncation.

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1-chloro -2 methyl propane

2- chlro-2-methyl propane

2- chloro butane

1-Chloro, 3,3- dimethyl pentane

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

Arrhenius concept explained

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Constant heat of neutralization

Quantitative determination of acid base strength

Catalytic property of acid

All above

Acid rain effects

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Human being

Crops

Aquatic life

All above

A boy accidently splashes a few drops of conc. H2SO4 on his cotton shirt. A few minutes later, the splashed part blacken and holes appear.This is because the sulphuric acid.

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Heats up the cotton so that it burns

Dehydrates the cotton

Causes cotton to react with oxygen of the air

Removes the elements of water from cotton

The reverse of photo chemical reaction is called.

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Phosphorescence

Chemiluminescence

Fluorescence

Photscnaitization

Which property is not exhibited by carbon in its compounds.

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Forming bounds to other carbon atoms

Formation multiple forms

Exhibiting allotropic forms

Forming compounds with coordination number beyond four

Al2Cl6 is an example of

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Ionic bond

Covalent bond

Co ordinate bond

Metallic bond

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Which is major component of Bordeaux mixture.

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Copper sulphate

Sodium chloride

Calcium chloride

Magnesium sulphate

The following ceramic product is mostly used as pigment in paints.

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TiO2

SiO2

uo2

ZrO2

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

The binding site on ribosome t-RNA and m-RNA is provided by

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Polysome

Ribosomal RNA

Codone

DNA

The statement that heat cannot flow spontaneously from a colder to a hotter body is the result of.

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The first law of thermodynamics

The second law of thermodynamics

The third law of thermodynamics

Henry's law

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

What element is the most abundant by mass in the Earth's crust.

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Fe

H

O

K

1 meter = ___________ nm

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10⁹

10^-9

10¹⁰

10^-10

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