Chemistry Questions

____ are atoms/molecules/ions containing the same number of electrons.

Which of the following statements are CORRECT?

I. Ethanol is a good solvent for organic compounds.

II. Boiling and melting points of ethanol are low with respect to water.

III. Ethanol is used tincture iodine

Valency of an element depends on which of the following?

I. Number of losing electron

II. Number of gaining electron

III. Number of sharing electron

Apart from proposing atomic theory, what did John Dalton researched on?

Washing soda is used ______.

I. for removing permanent hardness of water

II. for disinfecting drinking water

III. as a cleaning agent for domestic purpose

Isotopes have ______.

I. similar physical quantities and different chemical properties

II. different physical properties

III. similar chemical properties

Ionic compounds ______.

I. have high boiling point

II. have high melting point

III. conduct electricity in solution

Fill in the blank with the most appropriate option.

Ethanol is denatured to ___.