Question # 1

CO2 the oxidation number of C =.

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+1

+2

+3

+4

Electropositive character depends upon:

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Atomic size

Nuclear charge

Ionization energy

Electron affinity

Which one is largest?

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Exo

Peta

Atto

Pico

..................... is property of metals.

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Gases

Lustrous

Solids

Nil

The 2nd and third periods are called

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short period

Normal period

Long period

Very long period

Which one is the following belongs no Noble Gases?

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O

F

Ne

Nil

At freezing point which one of the following coexists in dynamic equilibrium?

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gas and solid

liquid and gas

liquid and solid

all of these

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

The no.of neutrons in deutrium is

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1

2

3

4

Which is a polar molecule?

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HCI

H₂

CI₂

O₂

Es is symbol of :

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Erbium

Einsteinium

Europium

Fremium

When the reaction causes to produced it is called.

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Chemical equlibrium state

Static equilibrium

Dynamic equilibriiun

All

pH of neutral solution is always.

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6

5

7

10

On which base atmosphere is divided into four regions?

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Change in pressure

Change in rediation

Change in temperature

Change in volume

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

Which one of the following does ot contain protein

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Pulses

Potatoes

Beans

eggs

You want to dry a gas which one of the following salt you will use?

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CaCl₂

NaCl

CaO

Na₂SIO₃

Such reaction which can be made proceed in either direction depending upon the condition:

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simple reaction

reversible reaction

irreversible reaction

chain reaction

The strong heating of coal in the absence of air called.

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Fractional Distilation

Destructive Distiation

Carbonization

Catenation

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

Which is used to remove the grease stains from clothes?

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NaOH

KOH

Al(OH)₃

NH₄OH

Ozone id beneficial for us as it:

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absorbs infrared radiations

absorbs ultraviolet radiation

absorbs chlorofluorocarbons

absorbs air pollutants

When a chemical reaction is completed.

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

Tin has Isotopes

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7

9

11

5

NaCI is face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-unit cells

Only one unit cell

8-unit cells

In cubic and hexagonal closest packing which layer has different arrangement.

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First

Second

Third

Fourth

Which is pseudo solid

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CaF2

Glass

NaCl

CaCl2

If we plot a graph between I/V at x-axis and pressure at Y -axis

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a parabolic graph is obtained

By increasing temperature straight line move toward x axis

By increases temperature straight line move toward y axis.

No. change in line by increasing temperature.

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

The unit of the rate constant is the same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

The number of moles of CO₂which contain 8.0 g of oxygen

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0.25

0.50

1.0

1.50

Which one of the following has the greater ionic characters in it.

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HF

HCl

H2O

H2

How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.

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3.01 x 10²³

1 x 10²³

6.02 x 10²³

1.03x 10²³

Acetylene reacts with ammoniacal cuprous chloride a red ppt is formed. This red ppt is of

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Copper chlorite

Coper chlorate

Cupric oxide

Copper acetylide

Which element is present in chlorophyll

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Ca

Mg

K

Be

Which compound is the most reactive

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Benzene

Ethene

Ethane

Ethyne

Which of the following statement is correct

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Na atom is smaller than Na⁺

Na atom is larger than K atom

F atom is smaller than F^-

F atom is larger than F^-

Which substance is used to convert alcohol to alkyl halide.

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SOCl2

PCl3

HCl +ZnCl2

All of these

Acetic acid is manufactured by.

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Distillation

Fermentation

Ozonolysis

Esterification

Which substance is used for silvering of mirror.

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Acetaldehyde

Ethanol

Ethylene glycol

Acetone

Ozone depletion in stratosphere region is mainly due to the reaction of O3 with

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O2

SO2

CFCs

All of these

Which of the following will have the highest boiling point.

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Methanal

Ethanal

Propanal

2-Hexanone

The most metallic elements from the following is

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Arsenic

Oxygen

Antimony

Bismuth

An ester can be prepared by the reaction of.

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Two alcohols

Alcohol and an aldehyde

An alcohol and an organic acid

an acid and a ketone