Question # 1

The number of significance figures in the number 80.7 is.

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1

2

3

4

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal.

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N2O3

HNO3

SO2

SOCl2

The matrix is usually in the form of.

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Sand

Limestone

Rocks

All

When a lead a storage battery is discharged .

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SO2 is evolved

PbS is consumed

Pb is formed

H2SO4 is consumed

A steel cannot qualify for stainless prefix until it has at least how many percent of chromium.

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10 %

20 %

5 %

30 %

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

Which of the following health effect is caused by lead.

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Cancer

Neurotoxin

Hypertension

Kidney damage

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

Temporary hard water is softened on industrial scale by adding.

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Mg(OH)2

Ca(OH)2

KOH

NaOH

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

Al2Cl6 is an example of

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Ionic bond

Covalent bond

Co ordinate bond

Metallic bond

Hot isostatic pressing is not a viable option if the chief criterion is

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Strength without gram growth

Lost cost

Zero porosity

Make it hard

Boric Acid is used

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In manufacture of pottery glaze

In medicine as an antiseptic

In tanning industry

All above

Which of tetra chloride is resistant to hydrolysis.

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CCl4

SiCl4

GeCl4

SnCl4

The technique which involves measurement of the changes in conductance of the solution by employing high frequency alternating current in known as.

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Potentiomerty

Polarography

Oscillometry

Conductomerty

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

The IUPAC name of C2(CN)3 is

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2,3-dicvano butanedinitrile

2,3 -dicyano -2- butenedinitrile

1,1,2,2-tetrcyanoethane

1,1,2,2, tetracyanocthenc

At constant temperature and pressure, the decrease in Gibbs free energy (F) in equal to

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Increase in entropy

Decrease in entropy

Reversible work done by the system

All types of work except the work of expansion

Opticla tweezers

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Are used to remove facial hair with miniaturized laser beams

use light to manipulate particles as small as single atom

Are a nanotechnology bases tool for stamp collectors

Don't exist

According to Usanovich concept a base is defined as any species.

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Capable of giving up anions

Combining with cations

Neutralizing an acid to give a salt

All of above

________is best in its cleaning action.

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Soap

Detergents

Surfactant

None of these

What is the ratio of stress to strain in a material loaded within its elastic ranger.

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Poisson’s ratio

Refractive index

Modulus of elasticity

None of above

Red colour of glass of due to the presence of

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Cu2O

CoO

MnO2

CdS

In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.

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Ammonia

O2

N2

NO

Hydrogen bons holding the strand to nucleic acids are formed between

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Sugar and base units

Base unit

Sugar ane phosphate units

Sugar units

The co ordination number of atoms in a hexagonal closed packed structure is

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2

6

12

4

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

Arrange the hydrides group 15 in the order of increasing boiling point.

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PH3 < AsH3 <SbH3 < BiH3 <NH3

PH3 <AsH3< SbH3< NH3 < BiH3

PH3 < AsH3<NH3 <SbH3<BiH3

NH3 < PH3 < AsH3 < Sb H3 < BiH3

Ozone layer of upper atmosphere is being destroyed by

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chlorofluorocarbons

SO2

Photochemical oxidants O2 and CO2

Smog

What of the following is not a Lewis base.

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CN-

AlCl3

NH3

ROH

Which of the following statements is not related with chemical equilirbium.

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The properties of the system become constant

The equilibrium can be approached from either direction

The chemical equilibrium is static is nature

A catalyst can hasten the approach towards equilibrium

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