Question

I. _______ is a life supporting component of air.

A. Hydrogen B. Helium C. Nitrogen D. Oxygen


II. The electronic configuration of Na+

is __________.

A. 2, 8 B. 2, 8, 1 C. 2, 8, 2 D. 2, 8, 3


III. The ionic compound used to make soap and detergent is ______.

A. Sodium chloride C. Calcium chloride

B. Sodium sulfate D. Potassium iodide


IV. _______ is an excellent conductor of electricity.

A. Lithium Iodide C. Barium Chloride

B. Potassium Iodide D. Sodium Chloride


V. A pair of electrons are mutually shared between two non-metals in _______.

A. Ionic bonds C. Covalent Bonds

B. Coordinate Covalent Bonds D. All of these​

Answer 1

Answer:

I. D

ii. A

III. B

IV. D

V. C

Explanation:

Oxygen is life supporting element as it helps in breathing. Na+ has 10 electrons k shell contains 2 while L shell contains 8.

NaCl is good conductor of electricity because it dissociates fastly. covalent bonds are pair of electrons Which are mutually shared.

May be I have made mistake in above, you also must confirm.