Question # 1

An ion is a charged particles:

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True

False

In some conditions

Never

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

Industrial chemistry deals with the manufacturing of compounds:

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in the laboratory

on micro scale

on commercial scale

on economic scale

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

The value of Planck's constant is

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6.63 x 10-34 Js

6.63 x 10-32 Js

6.63 x 10-30 Js

6.63 x 10-28 Js

The atomic number of potassium is:

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11

15

18

19

Atoms are arranged in ________________ structure in Bucky balls.

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Hollow

Cage

A & B

Nil

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

All metals are solid except

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AI

Mg

Na

Hg

The bond between two atoms will be ionic if the difference between their electronegativities is:

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Less than 1.7

Greater than 1.7

Zero

Less than 1.2

Which one of the following is not an electrolytic cell:

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Down cell

Galvanic cell

Nelson' cell

Both a and c

A reverse reaction is that.

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Which proceed from left to high

In which reactants reacts to form products

Which slow down gradually

Which speed up gradually

Extraction of metals from its ores is called.

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Metallurgy

Mining

Griding

All

A substance which can behave as an acid as well as a base is called.

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Acid

Base

Amphoteric

Neutral

Amino acid are linked to each other through.

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Hydrogen link

Ionic link

Gelatin link

Peptide link

Which one of the following diseases severe diarrhea and can be fatal?

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Joundice

Cholera

Dysentery

Typhoid

Mg²⁺ and Ca²⁺ ions react with soap to form calcium and magnesium salts of fatty acids called.

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Gelatin

Scum

Paste

None of them

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

General formula of alkyl radical is

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C_nH_2n+2

C_nH_2n-2

C_nH_2n+1

C_nH_2n

Formation profess of Ammonia by the combination Hydrogen and Nitrogen was given by:

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Dalton

Thomson

Haber

Waage

Soda lime is a mixture of..

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CaCl, + KOH

NaOH + CaO

NaOH + CaCl₂

Ca(OH)₂ + CaO

Coal having 90% carbon contents is called.

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Peat

Lignite

anthracite

bituminous

Many elements have fractional atomic masses. This is because

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The mass of the atom is itself fractional

Atomic masses are average masses of isobars

Atomic masses are average masses of isotopes

Atomic masses are average masses of isotopes proportional to their relative abundance

Which one of the following statements is incorrect.

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Enzymes are protein in nature

Enzymes are catalyst

Enzymes can catalyze any reaction

Urease is an enzyme

In which de excitation of electron of hydrogen atom maximum energy is relaeased.

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From n2 to n1

From n3 to n2

From na to n1

From na to n2

Which is not is state function

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Enthalpy

Entropy

Pressure

work

Which of the following solutions will have the highest boiling point

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0.1 M NaCI

0.1 M CaCI₂

0.1 M FeCI₃

0.1 M glucose

The number of H2O molecules in 9 grams of ice is

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3.01 x 10²³

6.02 x 10²³

6.02 x 10⁸

12.04 x 10²³

K_aand K_bof a conjugate acid and are related with k_was

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K_a+ K_b=K_w

K_a-K_b=K_w

K_a.K_b= K_w

K_a/ K_b= K_w

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

Quantum number values for 3p orbitals are.

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n = 0, l = 3

n = 3 , l = 1

n = 2, l = 1

n = 2 , l = 3

Hund's rule state that when electrons enter to the same sub levels they are.

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Singly occupied with same spin

Doubly occupy with same spin

Singly occupied with different spin

Doubly occupied with different spin

For which system does the equilibrium constant K_chas units of (concentration)^-1

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The oxidation of NO in air produces

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N₂O₃

NO₂

N₂O₃

N₂O₄

For ----------------- Mechanism, the first step involved is the same

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E1 and E2

E2 and S_N2

S_N1 and S_N2

E1 and S_N1

Which is the second most abundant element in the universe

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H

He

CO

C

Which element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

Ammonium nitrate fertilizers is not used for which crop

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Cotton

Wheat

Sugar cane

Paddy rice

Iodine deficiency in diet is known to cause.

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Beri Beri

Goiter

Rickets

Night blindness

The length of the polymer chain is specified by the number of repeating units which is called.

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Condensation

Co-polymerization

Iodine number

Degree of polymerization

Zymase can be used to convert glucose to

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Carbon and steam

CO2 and hydrogen

CO2 and Ethanol

Ethanol and water

Alkyl halides are considered to be very reactive compounds towards nucleophile because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bed leaving group

They have a nucleophilic carbon and a good leaving group

Which of the following is Ortho and Para directing group

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-I

-CHO

-COR

-NH₂

Water is disinfected by a substance to avoid toxification

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KMnO₄

Alums

O₃

Cl₂