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12th Class Chemistry Chapter Wise MCQs:

Karachi board, Sukkur board, Hyderabad board, Larkana board, Mirpur Khas board.

Sindh->12th Class->Chemistry MCQs

Sindh Question:

Who prepare first organic compound in laboratory

A: J.priesly
B: Whilar
C: Mandllef
D:
Answer: B

Sindh Question:

The mixture of hydrogen and carbon monoxide is called?

A: Water gas
B: Hydrogen gas
C: Natural gas
D: All of these
Answer: A

Sindh Question:

In the electrolysis of water which is collect at cathode?

A: Nitrogen gas
B: Hydrogen gas
C: Oxygen gas
D: None of these
Answer: B

Sindh Question:

The most electropositive among the following elements is

A: Fe
B: Na
C: Cs
D: Pb
Answer: B

Sindh Question:

________ of the following has highest first ionization energy

A: Br
B: Cl
C: F
D: I
Answer: C

Sindh Question:

________ atom has the smallest size

A: C
B: F
C: Li
D: Rb
Answer: C

Sindh Question:

________ ion has twh the largest radius

A: Al+3
B: Cr
C: F
D: O
Answer: B

Sindh Question:

The element of the group IIA are called

A: Metals
B: Non metals
C: Alkaline earth metals
D: Transition elements
Answer: B

Sindh Question:

__________ is the most volatile compound

A: HI
B: HCl
C: HBr
D: HF
Answer: A

Sindh Question:

The electronegative elements form

A: Acidic oxides
B: Basic oxides
C: Neutral oxides
D: None of these
Answer: A

Sindh Question:

______ of the following elements has the lowest first ionization energy

A: Na
B: F
C: I
D: Cs
Answer: D

Sindh Question:

The electropositive elements from

A: Acidic oxides
B: Basic oxides
C: Neutral oxides
D: None of these
Answer: B

Sindh Question:

Melting and boiling points gradually _______ in a periodic table from left to right up to the middle

A: Increases
B: Decreases
C: Remains constant
D: None of these
Answer: A

Sindh Question:

The unit of ionization potential is

A: Joule
B: Joule per mole
C: Calorie per mole
D: None of these
Answer: A

Sindh Question:

The unit of ionization energy is

A: Joule
B: Calorie
C: Electron volt
D: None of these
Answer: C

Sindh Question:

_________ is the most electronegative element

A: Fluorine
B: Iodine
C: Oxygen
D: Sodium
Answer: A

Sindh Question:

The value of ionization energy ________ in a period from left to right due to the decrease in atomic size

A: Increases
B: Decreases
C: Remains constant
D: None of these
Answer: A

Sindh Question:

Of the following given elements _________ atoms has the highest ionization energy

A: Be
B: F
C: N
D: Ne
Answer: B

Sindh Question:

In a given period the alkali metals have

A: Smallest atomic size
B: Lowest ionization energy
C: Lowest density
D: Highest electron affinity
Answer: B

Sindh Question:

The atomic weight of an element divided by its density is called

A: Atomic mass
B: Atomic volume
C: Atomic density
D: Atomic number
Answer: A

Sindh Question:

In the periodic table the highest ionization energies are for

A: Halogens
B: Noble gases
C: Alkali metals
D: Chalcogens
Answer: A

Sindh Question:

Ionization energy is lowest for

A: Inert gases
B: Alkali metals
C: Halogens
D: Alkaline earth metals
Answer: B

Sindh Question:

The lower ionization energies are found in the

A: Inert gases
B: Alkali metals
C: Transition elements
D: Halogens
Answer: B

Sindh Question:

The ionization energy __________ in a group from top to bottom with increase in atomic size

A: Increases
B: Decreases
C: Remains constant
D: None of these
Answer: B

Sindh Question:

Each vertical row of the periodic table includes elements with chemical characteristic that are in general

A: Identical
B: Similar
C: Different
D: Sometimes identical and sometimes different
Answer: B

Sindh Question:

The amount of energy required to remove an electron from an atom of an element in the gaseous state is called

A: Ionization potential
B: Ionization energy
C: Electron volt
D: Both A & B
Answer: B

Sindh Question:

On moving from left to right across a period in the periodic table , the size of atom generally

A: Decreases
B: Increases
C: Remains constant
D: Decreases up to IV A group and then increases
Answer: A

Sindh Question:

__________ of the following is a transition element

A: Ni
B: Rb
C: Al
D: As
Answer: A

Sindh Question:

In a _________ atomic volume increases with atomic number, from top to bottom ,as new shells are added up with increase in atomic number

A: Group
B: Period
C: Sub-group
D: None of these
Answer: A

Sindh Question:

The volume in cubic centimetres occupied by one gram atom of the element is called

A: Atomic volume
B: Atomic weight
C: Mass number
D: None of these
Answer: A