Question # 1

It is a strong electrolyte

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H2O

CH3COOH

NaOH

C6H6

Li belongs to ________________ block.

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s

p

d

f

................. can be decomposed into simpler substanmce.

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Compound

Element

Solution

Mixture

The equation of relationship between atomic number (Z) and mass number (A) is

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A = Z + N

A = Z - n

A = Z

A =2Z + n

The number of periods is:

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6

7

8

9

The atomic number of sodium is ............... .

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9

10

11

12

____________ do not conduct electricity.

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Electrolyte

Non-electrolyte

Both

Nil

The example of solution of a solid solute in a solid solvent is

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Brass

Fog

Cheese

Air

Electrons carry _________ charge.

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+

_

Neutral

Bouble Positive

_________ elements naturally occurring.

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92

118

93

117

By electrolytic refining of copper , it is ____________ % pure.

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98

99

99.99

100

Formula of palmitic acid is.

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C₁₅H₃₁COOH

C₁₂H₃₅COOH

C₁₅H₃₀COOH

C₁₇H₃₄COOH

Red hair contains compound of.

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Iron

copper

titanium

Molybdenum

The ability of carbon atoms to form chains or ring called.

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Hydrogenation

Chlorination

Cantenation

Halogenation

All water soluble metallic oxides have characteristic of:

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acidic

basic

neutral

amphoteric

Human body uses carbohydrates in the form of

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Glucose

Maltose

Fructose

Galatose

The percentage of water in human body is.

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40%

50%

60%

70%

Which one of the following is not air pollutants?

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N₂

CO

NO₂

O₂

The general formula of alkane is

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C_nH_2n+2

C_nH_2n-2

C_nH_2n

C_nH_2n+1

Which acid is found in Ant sting?

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Citric Acid

Formic Acid

Uric Acid

Sulphuric acid

Reactions which have comparable amounts of reactants and products at equilibrium state have:

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very small Kc value

Very large Kc value

Moderate Kc value

None of these

In laboratory urea was prepared by

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Wohler

Rutherford

Berzelius

Dalton

The change in heat energy of a chemical reaction at constant temperature and pressure is called.

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Enthalpy change

Bond energy

Heat of sublimation

Internal energy change

When external pressure is 23.7 torr, boiling point of water is

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100 ^oC

200^oC

98^oC

25^oC

Which formula will be used to determine the number of in electrons sub shell of an atoms.

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2(l+1)

2(2l+1)

(l+1)

(2l+1)

The volume of a gas at 0 oC is 273 dm3, the pressure remaining constant. At which temperature its volume will be doubled.

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273 K

273 ^oC

546 ^oC

316 K

"The components of which mixture can be separated by filtration".

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NaCl and CaCl2

Calcium carbonate and NaCl

Blue and green inks

Sand and naphthalene

When an atom reacts chemically and loses one or more electrons it is.

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Decomposed

Reduced

Oxidized

Catalyzed

The velocity of photon is

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Independent of its wavelength

Depends on its wavelength

Equal to square of its amplitude

Depends on its source

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

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O₂⁺²

N₂^-2

B₂

F₂

The oxidation of O -atom in OF3 is.

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-2

+2

-1

+1

The smallest collection of ions in an ionic compound is called.

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Formula unit

Chemical formula

Formula mass

Molecular formula

The reaction that involves gases, its rate does not depend upon

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Catalyst

Temperature

Moles dm^-3

Partial pressure

A snake was preserved in a solution and was placed in biology laboratory. The solution is.

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De ionized water

Fehling solution

Formalin

Chloroform

Ethanol can be converted into ethanoic acid by

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Hydrogenation

Hydration

Oxidation

Fermentation

Which class of compounds can not show positional isomerism.

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Alkanes

Alkene

Alkynes

Alcohol

Select from the following the one which is Alcohol

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CH₃CH₂OH

CH₃OCH₃

CH₃COOH

CH₃.CH₂.Br

Typical transition element is

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Sc

CO

Ra

Y

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

The substance that retard the activity of enzyme is called.

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Co enzyme

Epo enzyme

Activity

Substrate

Which one is perchloric acid

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HClO

HClO₃

HClO₄

Elimination Bimolecular reactions involve

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Second order kinetics

First order kinetics

Third order kinetics

Zero order kinetics

All of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

During the manufacturing process of cement the temperature of the decomposition zone goes up to.

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600 ^oC

900 ^oC

1000 ^oC

1200 ^oC