Match the elements given in Column I with the color they impart to the flame given in Column II.

Codes

The least basic metal hydroxide among the following is-

1.  $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

2.  $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

3.  $\mathrm{Sr}{\left(\mathrm{OH}\right)}_2$

4.  $\mathrm{Ba}{\left(\mathrm{OH}\right)}_2$

Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterized by which of the following properties?

a. High boiling point

b. High negative standard electrode potential

c. High-density

d. Large atomic size

1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)

Identify the correct formula of halides of alkaline earth metals from the following.

1.  ${\mathrm{BaCl}}_2·2{\mathrm{H}}_2\mathrm{O}$

2.  ${\mathrm{BaCl}}_2·4{\mathrm{H}}_2\mathrm{O}$

3.  ${\mathrm{CaCl}}_2·6{\mathrm{H}}_2\mathrm{O}$

4.  ${\mathrm{SrCl}}_2·4{\mathrm{H}}_2\mathrm{O}$

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of the spectrum). The elements of which of the following groups will impart colour to the flame is-

(a) 2

(b) 13

(c) 1

(d) 17

Choose the correct option

1. (a), (c)

2. (b), (c)

3. (c), (d)

4. (b), (d)