CLASS VII Chapter 5 : Acids, Bases and Salts
 Fill in the blanks :
 1. Spinach contains_____________ acid while tamarind contains ________________ acid.
2. The gas which escapes out from many aerated soft drink is _____________
3. Carbon burns in air to form _______________
 4. The chemical name of lime water is ______________
 5. _______________ is the reaction between an acid and base.
6. An aqueous solution of sodium oxide changes ________________ litmus to blue.
7. Phenolphthalein indicator turns acidic solutions to ______________ and basic solutions to _____________.
 8. The chemical name of moist baking soda is _____________
 9. Calamine solution contains __________________( a base ).
 10.Litmus is obtained from the _____________________
 11.Curd contains __________ while vinegar contains ___________

 Complete the following word equations : 
1. Zinc + hydrochloric acid                                                       ___________+ _____________
 2. Sodium hydroxide + Hydrochloric acid                               ___________+ ________
3. Calcium hydroxide + sulphuric acid                                            _____________+ ________

True or False :                        
1. All acids turn blue litmus red. True / False
2. Neutral solution can change the colour of litmus. True / False
 3. Orange juice turns blue litmus red. True / False
 4. Substances which are neither acidic nor basic are called neutral. True/ False
 5. An acid and a base neutralize each other and from a salt. True / False.
 6. China rose indicator turns acidic solution to green. True / False

 Name the following :
 1. Two natural indicators.
2. One artificial indicator
3. Two pollutants in the air which causes acid rain
. 4. Two substances which can neutralize an ant’s bite.
 5. Two acids found in citrus fruits

. Define 1. Indicators 2. Neutral solution

 Chapter 6: Physical and Chemical Change
 Fill in the blanks:
1. Changes that lead to the formation of new substances are called ________________
 2. Melting of candle wax is a______________ change but its burning is a ______________ change. 3. Growth of a plant is a ____________ change while formation of clouds is a _____________ change.
 4. A brown layer formed when an iron article is left exposed in air in an open area is called ___________
 5. Large crystals of pure substance are obtained by ____________
_ 6. The brown layer deposited on an iron nail dipped in copper sulphate solution is due to