Chemistry MCQS

621. What is the chemical formula of hydrochloric acid?
a) HNO3
b) H2SO4
c) HCl
d) H3PO4

622. What happens to the pH value when an acidic solution is diluted with water?
a) It increases
b) It decreases
c) It remains the same
d) It becomes neutral

623. What is the product when an acid reacts with a metal hydroxide?
a) Salt and water
b) Salt and hydrogen gas
c) Salt and oxygen gas
d) Salt and carbon dioxide

624. What is the pH value of a solution with a high concentration of hydrogen ions?
a) Less than 7
b) Exactly 7
c) More than 7
d) 7.5

625. What is the chemical formula of nitric acid?
a) H2SO4
b) HNO3
c) HCl
d) H3PO4

626. What is the product when an acid reacts with a metal sulfide?
a) Salt and water
b) Salt and hydrogen gas
c) Salt and sulfur dioxide
d) Salt and carbon dioxide

627. What is the pH value of a solution with a low concentration of hydrogen ions?
a) Less than 7
b) Exactly 7
c) More than 7
d) 7.5

628. Which of the phosphorous has tetrahedral, tetraatomic molecules, and is more reactive?
a) Black
b) Violet
c) White
d) Red

629. The number of allotropes of phosphorus in the solid state is?
a) 2
b) 3
c) 4
d) 6

630. Copper forms a colorless bead in borax bead test in a reducing flame. The oxidation state of copper is?
a) +1
b) +2
c) +3
d) +4