Test Paper Of Class 7 Science Chemistry Chapter 5 Acids, Bases and Salts
Chapter 5 Test Paper (01)
Class 7 Science Chemistry Chapter 5 Acids, Bases and Salts Test Paper Set-1 Text Form:-
PGRMS Education (Worksheet)
SAMPLE PAPER (01)
CLASS: 7 MAX.MARKS :30
SUBJECT: SCIENCE (Chemistry) TIME: 1:30 HOUR
CH: 5 (Acids, Bases and Salts)
I. All questions are compulsory.
II. This question paper contains 18 questions divided into three Sections:- A, B, and C.
III. Section A has 10 questions of 1 mark each. Section B has 4 questions of 2 mark each and Section C has 4 questions of 3 mark each.
(Section – A)
In Questions 1 to 10, there are four options, out of which one is correct. Write the correct answer.
1. Honey bee stings and ant bites can be _________ using alkaline medicine such as baking powder.
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D. none of the above
2. Products of a neutralisation reaction are always.
(a) an acid and a base.
(b) an acid and a salt.
(c) a salt and water.
(d) a salt and a base.
3. In which of the following acetic acid is used?
B. To remove nail polish.
D. White lead.
4. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are.
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink
5.Which acid is used in dentistry and orthodontics as an etching solution?
A. Tartaric acid B. Phosphoric acid
C. Carbonic acid D. Acetic acid
6. ‘Litmus’, a natural dye is an extract of which of the following?
(a) China rose (Gudhal) (b) Beetroot
(c) Lichen (d) Blue berries (Jamun)
7. The reaction of the acid and the ________ produces carbon dioxide, which causes dough and batters to rise.
A. baking soda B.washing soda
C. sodium hydroxide D. ammonium hydroxide
8. A solution changes the colour of turmeric indicator from yellow to red. The solution is.
(a) basic (b) acidic
(c) neutral (d) either neutral or acidic
9. Which of the following is a use of sodium hydroxide?
A. It is used in the manufacture of soaps, paper.
B. It is used in the manufacture of synthetic fibers like rayon.
C. It is important constituent in drain cleaners.
D. All of the above.
10. Which of the following set of substances contain acids?
(a) Grapes, lime water.
(b) Vinegar, soap.
(c) Curd, milk of magnesia.
(d) Curd, vinegar.
(Section – B)
11. While playing in a park, a child was stung by a wasp. Some elders suggested applying paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?
12. Name the source from which litmus solution is obtained. What is the use of this solution?
13. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F)
(ii) Sodium hydroxide turns blue litmus red. (T/F)
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)
(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)
14. Describe the process of neutralisation with the help of an example.
(Section – C)
15. You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down an activity to find the nature (acidic/basic/neutral) of each solution.
16. You are provided with three test tubes A, B and C as shown in Figure, with different liquids. What will you observe when you put.
(a) a piece of blue litmus paper in each test tube.
(b) a piece of red litmus paper in each test tube.
(c) a few drops of phenolphthalein solution to each test tube.
17. Explain why:
(a) An antacid tablet is taken when you suffer from acidity.
(b) Calamine solution is applied on the skin when an ant bites.
(c) Factory waste is neutralised before disposing it into the water bodies.
18. Match the substances in Column I with those in Column II.