Question # 1

A trend which is common to elements of both the group IA and group VII A ongoing from top to bottom.

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Boiling point increases

Electron affinity increases

Oxidizing power increases

Ionization energy decrease

The equivalent conductance (^) and molar conductance ( ^ m ) of BaSO4 are related as.

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^ = ^m/2

^/2 = ^m

^ = ^m

^ = ^m/4

Manganese steel usually contains how many percent of manganese.

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1 to 5

3 to 10

11 to 14

14 to 18

Variable electrovalency is due to the following reasons.

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Unstable configuration of core

Inset electron pair effect

All of above

None of above

Final paper wound in the form of a real having final moisture of about.

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6-8%

9 - 12 %

13-15 %

4 - 10%

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

Which of the following statements is wrong.

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Covenant compounds are generally soluble is polar solvents.

Covalent compounds have low melting and boiling points

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H

Which of the following source of energy is abundant everlasting and non polluting.

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Nuclear

Electric

Solar

All above

The glow of the yellow phosphorous as a result of slow oxidation in air is called.

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Chemiluminescene

Luminescence

Biolumineacence

Photolysis

The minimum amount of energy that the reacting molecules must posses at the time of collations in under to produce effective collisions is called.

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Free energy

Threshold energy

Activation energy

External energy

In B2H6 molecule

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There exists a direct B-B a -bond

All the atoms are in one plane

All the B-H bonds are normal covalent bonds

There exist two bonds between the boron atoms.

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

The action of all the relations of all the organism to their environment is called

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Biology

Botany

Ecology

Archiology

Sterols are steroids having the functional gruup.

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Ketonic

Al;coholic

Phenolic

Aldehydic

Which of the following solution would have the largest depression in freezing point.

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1% glucose

1 % KCl

1 % AlCl3

1 % BaCl2

Which of the following pairs of fundamental particles are present in equal numbers in a neutral atom.

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Proton and neutron

Proton and positron

Electron and proton

Neutron and electron

Which of the following is not true of ozone.

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It is a strong electilizing agent

It attacks organic compounds containing carbon carbon double bond

Its molecular is linear and has two different O-O bond lengths

It is more powerful oxidising agent at molecular oxygen

The light source in AAS used is

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UV light

Visible light

Radio waved

Hollow cathode lamp

A mixture of weak acid and its salt is.

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Alkaline buffer

Acidic buffer

Neutral buffer

All of above

Which metal burns in air at high temperature with the evolution of much heat.

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Cu

Hg

Pb

Al

Which of the following statement is not relevant with nitrous oxide.

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It is a colorless and odourless gas

It is non toxic gas

It is present in the atmosphere in higher concentration

It has high reactivity in the lower atmosphere

The fertilizers which provide single nutrient from NPK are called _______ fertilizer

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Straight

compound

Both A and b

None of above

What prefix in steel identification means composition varies from normal limits.

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E

B

X

F

What is a process of producing a hard surface in a steel having a sufficiently high carbon content to respond to hardening by a rapid cooling of the surface?

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Cyaniding

Nitriding

Flame hardening

Stability

The name hydrogen was proposed by.

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Lavoisier

Rutherford

Henry Cavandish

Scheele

Enzymatic action is heat at a fixed

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Temparature

pH

Both of these

None of these

Which of the following responsible for depletion of ozone layer in upper strata of the atmosphere.

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Polyhalogens

Ferrocene

Freons

Fullerencs

Poise is a unit of.

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Refractive index

Optical activity

Fluidity

Viscosity

What type of steel has 0.8 % carbon and 100% pearlite.

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Austenite

Eutectoid

Hyper eutectoid

Silver steel

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