Question # 1

in the system of designating wrought aluminum alloys the letter F that follows the number indicates what condition of the alloy.

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As fabricated

Calcined

Annealed

Strain hardened

Which of the following chloride is soluble in hot water.

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Hg2Cl2

AgCl

PbCl2

All above

The one which is not a purine base

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Cytosine

Guanine

None of these

Adenine

Which of the following process is a source of nuclear pollution.

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Uranium mining

Uranium processing

Reactor waste

All above

The total number of crystal systems and the number of Bra via is lattices are.

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7,7

7,14

14,7

14,28

The degree of dissociation of weak acid increases with.

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Decreasing pressure

Increasing pressure

Increasing concentration

Decreasing concentration

Which of the following statements is not correct with respect to applications of H- bonding.

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It explains the usual b.p. and m.p of certain class of compound.

It explains the solubility of certain organic compounds in hydroxylic solvents

It explains the lack of ideal behavior in gases and solutions

It has stonrg influence on the configuration of certain molecules.

How many unpaired electron are there in a strong field iron (II) octahederal compled.

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0

1

2

4

The liquor is screened to exclude ________ material

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Fibrous

Polymers

Maltose

Sucrose

Increased asthmatic attacks in certain seasons are related to.

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Inhalation of seasonal pollens

Eating of seasonal vegetables

Low temperature

Wet and dry environment

The width of a carbon nano tube is.________ nm

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1

1.3

2.5

10

Which of the following substance act as photochemical oxidant

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Ozone

NOx

peroxyacetyl nitrate

All above

Which of the following property of liquids concern with the interval resistance to its flow.

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Refractive inded

Viscosity

Optical activity

Dipole moment

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

The possible sub levels in the n = 4 energy level are.

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s,p,d

s,p,d,f

s

s,p

Which of the following compounds would be most ionic to charcter.

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PbCl4

PbCl2

SnCl4

SnCl2

Organic farming is the technique of raising crops through uses of.

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Manures

Biofertilizers

Resistant varieties

All of these

Select the major product obtained from the addition of HBr to I -Methyl cyclohexene

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1-bromo -2- methyl cyclohexane

6- bromo-i- methyl cyclohex -i- ene

3- bromo -1- methyl cyclohex - 1- ene

I-bromo -I- methyl cyclohexane

Consider the coordination compound Na2[Pt(CN)4] the Lewis and is

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[Pr(CN)4]2

Na+

Pt

Pt2+

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.

The freezing point of a solvent

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Will increase on adding a solute

Will decrease on adding a solute

Will note change on adding solute

None of the above

Commercial incinerators produce.

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Smoke

CO

NOx

All above

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

For covalent bond to form between two atoms A and B

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Transference of electrons must take place from A to B

A pair of electrons of A is shared by both A and B

A and B contribute equal no. of electrons for mutual sharing by A and B

One of the atom A or B must already have octet of electrons.

Increasing oxygen contents in oxyacids leads to.

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An increase in thermal stability

An increase in acid strength

A decrease in oxidizing power

All above

Lead pencil contain

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Lead

Lead sulphide

a mixture of lead and silica

graphite

Which of the following is not an alum.

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KAI (SO4)3 12 H2O

NaAI (SO4)2 12 H2O

NH4Fe (SO4)2 12H2O

FeAl (SO4)2 . 12 H2O

Which of the following statement is not correct.

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The element with highest IE belongs to group 18

In each period the element with lowest IE belongs to group I

In each period the element with highest IE is a noble gas

In the second period as we move from left to right, ionization energy increases reqularly.

The agricultural field that produces maximum methane gas into atmosphere is

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Wheat field

Paddy field

Cotton field

Groundnut field

A property which gradually increases on moving down group in the periodic table is

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Ionization enthalpy

Elemtronegativity

Electron affinity

atomic size

All halogens exist as covalent molecules.

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Monoatomic

Daitomic

Triatonic

Tetra atomic

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