Acids Bases and Salts

Acids release ____ ions when added in water.

• OH- ions

• H+ ions

• More H+ and less OH- ions

• No ions

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) Temperature of the solution decreases

(ii) Temperature of the solution increases

(in) Temperature of the solution remains the same

(iv) Salt formation takes place

• (a) (i) and (iv)

• (b) (i) and (iii)

• (c) (ii) only

• (d) (ii) and (iv)

Tomato is a natural source of which acid?

• Acetic acid

• Citric acid

• Tartaric acid

• Oxalic acid

Na2CO3 . 10H2O is

• (a) washing soda

• (b) baking soda

• (c) bleaching powder

• (d) tartaric acid

Alkalis are

• (a) acids, which are soluble in water

• (b) acids, which are insoluble in water

• (c) bases, which are insoluble in water

• (d) bases, which are soluble in water

What is the pH range of our body?

• (a) 7.0 – 7.8
  
  
  

• (b) 7.2 – 8.0

• (c) 7.0 – 8.4

• (d) 7.2 – 8.4

Rain is called acid rain when its:

• (a) pH falls below 7

• (b) pH falls below 6

• (c) pH falls below 5.6

• (d) pH is above 7

Sodium hydroxide is a

• (a) weak base

• (b) weak acid

• (c) strong base

• (d) strong acid

Sodium hydroxide turns phenolphthalein solution

• (a) pink

• (b) yellow

• (c) colourless

• (d) orange

How many water molecules does hydrated cal-cium sulphate contain?

• (a) 5

• (b) 10

• (c) 7

• (d) 2