Question

Which of the following is a property of Strontium chloride?
A. Ionic substance
B. Nonpolar covalent substance
C. Polar covalent substance
D. Macromolecular substance
E. Metallic substance

Answer 1

Hint : Strontium is an alkaline earth metal and belongs to $ s $ block. Chlorine is a nonmetal that belongs to the halogen family and also has the highest electron affinity. Ionic bonds are formed between a metal and a nonmetal, whereas covalent bonds are formed between two nonmetals.

Complete Step By Step Answer:
Strontium chloride is a salt of strontium and chlorine that has the chemical formula $ SrC{l_2} $ .Strontium belongs to the group $ 2 $ . That means the valency of Strontium is $ + 2 $ and has two electrons in its valence shell. Chlorine is a group $ 17 $ element. It has $ - 1 $ valence and has seven electrons in its valence shell. Therefore, electrons are transferred from chlorine to strontium to form a chemical bond and the bond formed is an ionic bond.
Hence, the correct option is A.

Additional Information:
 $ SrC{l_2} $ forms neutral aqueous solutions. It is a colorless to white crystalline solid or powder. It is soluble in water. The compounds of strontium have less toxicity. On contact with flame, it emits a bright red color. Thus, it is used as a source of redness in fireworks. $ SrC{l_2} $ can be prepared by the reaction of Hydrochloric acid with Strontium hydroxide or Strontium bicarbonate or carbonate. Strontium chloride is not flammable and does not react with other chemical species.
Small quantities of Strontium chloride is employed in glass making and metallurgy. Strontium chloride hexahydrate has the capacity to reduce tooth sensitivity and is therefore present in toothpastes. Strontium chloride is also used in storing ammonium at low pressure. The radioactive isotope, strontium - $ 89 $ , is used for the treatment of bone cancer. Small amounts of Strontium chloride are essential for seawater aquaria which is consumed in the production of the exoskeletons of certain planktons.

Note :
Strontium chloride has fluorite structure and is also the precursor to other compounds of strontium. Strontium chloride is an inorganic chloride that cannot be produced naturally but produced through chemical methods.