Acids, bases and salts Worksheet-3
Multiple Choice Questions:
(A) Distilled water is germ free water
(B) Distilled water contains mineral ions.
(C) Rain water contains ions.
(D) Rain water contain microorganisms.
(A) Red (B) Yellow (C) Orange
(D) Pink (E) colourless
(A) CO2 reacts with Ca(OH)2 forming calcium carbonate
(B) CO2 reacts with Ca(OH)2 forming calcium carbonate
(C) CO2 reacts with water forming calcium hydroxide
(D) None of these
(A) The dye present in the litmus doesn’t react with dry HCl
(B) Protons formed during ionization of acid change the colour of litmus paper
(C) Chloride ions are required for changing the colour of litmus paper
(D) Hydroxide ions formed during ionization of water reacts with the dye and changes its colour
(A) Citric acid (B) Hydrochloric acid
(C) Lactic acid (D) Acetic acid
(A) It will increase (B) It will decrease
(C) It will remain the same (D) Cannot be predicted
(A) Concentrated acid is added to water with stirring
(B) water is added to concentrated acid with stirring
(C) Both acid and water are added simultaneously in a beaker
(D) water and acid should not be mixed
(A) FeCl2 + H2O (B) FeCl3 + H2↑
(C) FeCl2 + H2(g) (D) FeCl2
(A) CaSO4 + CO2 + H2O
(B) CaSO4 + CO + H2↑
(C) CaSO4 + CO2↑
(A) Al(OH)3 (B) Ca(OH)2 (C) Mg(OH)2 (D) Be(OH)2
Distilled water does not contain ions where as rain water contains mineral ions which carry electric current.
Baking soda contains sodium hydrogen carbonate, which gives alkaline solution in water.
due to the formation of calcium carbonate lime water turns milky.
When a solution is diluted number of moles of H3O+ per ml decreases.
When concentrated acid is added to water then heat is evolved gradually and is easily absorbed by large amount of water.
When water is added to concentrated acid then large amount of heat is evolved at once and it catches fire.
CaCO3 + H2SO4 → CaSO4 + H2O + CO2 Egg shell is made of calcium carbonate.