Which compound is formed by the combination of calcium chloride and sodium carbonate?
a. Calcium carbonate + Sodium chloride
b. Sodium carbonate + Calcium chloride
c. Calcium chloride + Sodium carbonate
d. Sodium chloride + Calcium carbonate
Answer: d. Sodium chloride + Calcium carbonate
What is the valency of oxygen in the H2O molecule?
a. 1
b. 2
c. 3
d. 4
Answer: b. 2
In the formation of the HCl molecule from H and Cl atoms, how many covalent bonds are present?
a. 1
b. 2
c. 3
d. 4
Answer: a. 1
What is the product formed when washing soda is added to hard water to soften it?
a. Sodium chloride
b. Sodium carbonate
c. Calcium carbonate
d. Sodium sulfate
Answer: c. Calcium carbonate
Which chemical bond involves the sharing of electrons between atoms?
a. Ionic bond
b. Covalent bond
c. Metallic bond
d. Hydrogen bond
Answer: b. Covalent bond
What is the charge on a chloride ion (Cl-)?
a. +1
b. -1
c. 0
d. +2
Answer: b. -1
In the formation of the H2 molecule, how many electrons are shared between the two hydrogen atoms?
a. 1
b. 2
c. 3
d. 4
Answer: b. 2