M.M: 39 marks Dated: 16/06/2011
Time: 45 minutes
Q 1: Write True or False for the following plus write the correct answer for the false statements: (1 mark each x 10 = 10 marks)
i. The word acid comes from the latin word “acere” which means bad - _________.
ii. Substances which are bitter in taste and feel soapy on touching are called salts - _________.
iii. Acids turn red litmus blue - ____________.
iv. Neutral solutions are more acidic and less basic - ___________.
v. Sodium hydroxide turns red litmus to blue - _________.
vi. The symbol for sodium is S - ________.
vii. The symbol for potassium is K - _________.
viii. The sting of an ant contains an acid called acetic acid - _________.
ix. The formula for sodium hydroxide is NaOH - ________.
x. The formula for hydrochloric acid is HoCl - ________.
Q 2: Fill in the blanks (1 mark each x 16 = 16 marks)
ii. The formula of sulphuric acid is ___________.
iii. Acid + Base -------------> __________ + Water.
iv. Name of one common antacid is _________________ (more than one word may come).
v. The formula of water is ____________.
vi. The formula of nitric acid is _____________.
vii. In case of ___________ substances, when one drop of their solution is put on either blue litmus or red litmus paper, there is no change in the colour of litmus paper.
viii. ______________ turns red litmus to blue.
ix. A base which is soluble in water is called an __________.
x. ________ acid is used in making storage batteries for cars, buses, trucks, inverters.
xi. _________ acid is used in fizzy soft drinks and soda water.
xii. ________ acid is present in curd and in sour milk.
xiii. __________ acid is present in tamarind, unripe grapes, and unripe mangoes.
xiv. ___________ acid is present in spinach.
xv. _______ acids are the naturally occurring acids which are found in various types of plants and animals.
xvi. ___________ turn blue litmus to red.
Q 3: Name one natural and one synthetic indicator. (1 mark)
Q 4: Write names of two neutral substances. (1 mark)
Q 5: Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain. (2 marks)
Q 6: What is meant by acid rain? How is acid rain caused? What two damages are caused by acid rain? (3 marks)
Q 7: Name two materials which should be added to acidic soil to reduce the acidity. Give reason. (3 marks)
Q 8: What are three types of salts? Give one example of each type of salt. (3 marks)
