What are isobars?

• Elements with same atomic number but different mass number

• Elements with different atomic number but same mass number

• Elements with different atomic number and different mass number

• Elements with same atomic number and same mass number

Which of the following pairs is incorrect?

I.     Haematite : Iron
II.   Pitchblende : Copper
III.  Monazite : Thorium

• Only I

• Only II

• I and II

• I and III

Which of the following bonds are weakest in nature?

• Single bond

• Double bond

• Triple bond

• Hydrogen bond

In the following reaction, fill in the blank
Acid + Base →............ + Water

• Carbon Dioxide

• Metal Oxide

• Hydrogen Gas

• Salt

Which of the following is an inert gas?

• Hydrogen

• Nitrogen

• Oxygen

• Argon

Ozone is an ............. of oxygen.

• Allotrope

• Isotope

• Isobar

• Isotone

Process of loosing electrons is known as .............

• oxidation

• reduction

• radiation

• Both oxidation and reduction

Anions are formed by............

• losing of electrons

• gaining of electrons

• gaining of neutrons

• losing of neutrons

119.

What is the chemical formula for Sodium Chloride (Salt)?

• NaCl₂

• NaCl

• Na₂Cl

• Na₂C

What is endothermic reaction?

• Reaction in which heat is released.

• Reaction in which heat is absorbed.

• Reaction in which neither heat is released nor absorbed.

• None of the above.