Select the correct option based on statements below:

Assertion (A):	Ether behave as bases in the presence of mineral acids.
Reason (R):	It is due to the presence of lone pairs of electrons on the oxygen atom.

  

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

Assertion : ${\mathrm{NO}}^{+}$ and ${\mathrm{CN}}^{-}$ both have same bond order and magnetism

Reason : ${\mathrm{NO}}^{+}$ and ${\mathrm{CN}}^{-}$ are isoelectornic species.

Assertion : Crystals of hydrated calcium sulphate $\left(\mathrm{gypsum} : {\mathrm{CaSO}}_4, 2{\mathrm{H}}_2\mathrm{O}\right)$ are soft and easily cleaved.

Reason : Crystals of anhydrous calcium sulphate $\left(\mathrm{anhydrite} : {\mathrm{CaSO}}_4\right)$ are very hard and very difficult

               to cleave.

 When two atoms combine to form a molecule, energy is: 

Which of the following compounds possesses the highest melting point?

1. BeCl₂

2. MgCl₂

3. CaCl₂

4. SrCl₂

The diamagnetic species among the following is:

1. NO

2. CO

3. O₂

4. B₂

Which of the statements are not true for AlCl₃-

1. AlCl₃ fumes in moist air forms HCl with moisture

2. Anhydrous AlCl₃ exists as Al₂Cl₆

3. Anhydrous AlCl₃ is ionic

4. Anhydrous AlCl₃ is trigonal planar molecule at higher temperature

A Compound with maximum ionic character is formed from:

The crystal lattice of electrovalent compound is composed of :

1. Atoms

2. Molecules

3. Oppositely charged ions

4. Both molecules and ions

Ions are formed from neutral atoms by-

1. Loss of electrons

2. Gain of electrons

3. Sharing of electrons

4. Loss and gain of electrons