1. Alkalis are ?

acids, which are soluble in water

acids, which are insoluble in water

bases, which are soluble in water

bases, which are insoluble in water

Answer: bases, which are soluble in water

Explanation:


2. Brine is an ?

aqueous solution of sodium bicarbonate

aqueous solution of sodium carbonate

aqueous solution of sodium hydroxide

aqueous solution of sodium chloride

Answer: aqueous solution of sodium chloride

Explanation:


3. Egg shell is made up of ?

CaCl2

CaO

CaCO3

Ca(OH)2

Answer: CaCO3

Explanation:


4. Which one of the following can be used as an acid-base indicator by a visually impared (blind) student ?

Turmeric

Vanilla essence

Litmus

Petunia leaves

Answer: Vanilla essence

Explanation:


5. NaHCO, formed by reaction of ?

NaOH + Na2CO3

Na2CO3 + HCl

NaCl + H2CO3

NaOH + H2CO3

Answer: NaOH + H2CO3

Explanation:


6. Ag2S reacts with H2SO4 to form ?

AgOH + H2S

AgSO4

Ag2O + H2S

Ag2SO4 + H2S

Answer: Ag2SO4 + H2S

Explanation:


7. Sodium carbonate is a basic salt because it is a salt of a ?

strong acid and weak base

weak acid and strong base

weak acid and weak base

strong acid and strong base

Answer: weak acid and strong base

Explanation:


8. An aqueous solution with pH zero is ?

Amphoteric

Neutral

Acidic

Alkaline

Answer: Acidic

Explanation:


9. The H + ion concentration of a solution is 1.0×10-5m. The solution is ?

Neutral

Amphoteric

Acidic

Alkaline

Answer: Acidic

Explanation:


10. Due to excess passing of CO2 through an aqueous solution of slaked lime, its milkiness fades because ?

Due to the production of more heat

Calcium oxide is produced

Calcium carbonate is produced

Calcium bi-carbonate is produced

Answer: Calcium carbonate is produced

Explanation: