1. Which of the following statements is true about \[Ca\left(OH\right)_{2}\]
a) It is used in the preparation of bleaching powder
b) It is a light blue solid
c) It does not possess disinfectant property
d) It is used in the manufacture of cement
Explanation: It is used in the preparation of bleaching powder
2. Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?
a) \[Be\left(OH\right)_{2}\]
b) \[Mg\left(OH\right)_{2}\]
c) \[Ca\left(OH\right)_{2}\]
d) \[Ba\left(OH\right)_{2}\]
Explanation: \[Be\left(OH\right)_{2}\]
3. Dead burnt plaster is
a) \[CaSO_{4}\]
b) \[CaSO_{4}.\frac{1}{2}H_{2}O\]
c) \[CaSO_{4}.H_{2}O\]
d) \[CaSO_{4}.2H_{2}O\]
Explanation: \[CaSO_{4}\]
4. The one which does not show variable valency is
a) barium
b) titanium
c) copper
d) lead
Explanation: Barium shows fixed valency whereas Ti and Cu (transition metals) and Pb (due to inert pair effect) show variable valency.
5. Alkaline earth metals form ions of the general formula
a) \[M^{2+}\]
b) \[M^{+}\]
c) M
d) \[M^{2-}\]
Explanation: \[M^{2+}\]
6. The number of covalent bonds formed by beryllium is
a) 2
b) 3
c) 4
d) 5
Explanation: Since Be has two valence electrons, it forms only two covalent bonds.
7. Alkaline earth metals show typical characteristics of
a) inner transition elements
b) noble gases
c) representative elements
d) transition elements
Explanation: Alkaline earth metals show typical characteristics of representative elements
8. The elements of group-2 are called alkaline earth metals because
a) they are alkaline in nature
b) they occur in earth’s crust and form alkaline salts
c) their oxides are alkaline and occur in earth’s crust
d) these are s-block elements.
Explanation: Their oxides are alkaline and occur in earth’s crust.
9. Alkaline earth metals are
a) reducing agents
b) oxidising agents
c) amphoteric
d) acidic
Explanation: Because of low I.E. and high hydration energies.
10. Of the following, most reactive alkaline earth metal is
a) beryllium
b) barium
c) calcium
d) strontium
Explanation: Ba is most electropositive amongst the listed and hence most reactive.