SCIENCE  CLASS VII      L-5

Acids, Bases and Salts

Q.1 Fill in the blanks.

i) An acid tastes s_________

ii) A base tastes b__ tt______

iii) LItmus, a natural indicator is extracted from Li_________

iv) An indicator used in a neutralization reaction is phe___ph_____lein.

v) Sugar is a n....u............l substance.

Q.2 Match the following.

Column I         Column II

a) An antacid           i) Formic acid

b) An Ant                 ii) Milk of magnesia

c) China Rose          iii) Turns red litmus blue.

d) An acid                iv) A natural indicator

e) A base                  v) Turns blue litmus red

Q.3 Bring a soil sample of your area, find out whether it is acidic, basic or neutral with

the help of red or blue litmus solution /paper. Write this observation .

Q.4 According to their nature give proper place to each substance given below.

Curd, Common Salt, Vinegar, Soap, Sugar, Lime water, Lemon Juice, Window

Cleaner.

1. Acidic Nature

2. Basic Nature

3. Neutral Substances

Q.5 Complete the following table

. Name of Substance.	Litmus used	Colour change
Curd	Red	No change
Lime water	Red
Lemon Juice	Blue
Window Cleaner	Blue
Sugar	Red
Vinegar	Blue
Baking soda Blue	Blue