CBSE Class 7 Science Acid Bases and Salts Worksheet Set A

Download printable Science Class 7 Worksheets in pdf format, CBSE Class 7 Science Acid Bases and Salts Worksheet Set A has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 7 Assignments and practice them daily to get better marks in tests and exams for Grade 7. Free chapter wise worksheets with answers have been designed by Standard 7 teachers as per latest examination pattern

Acid Bases and Salts Class 7 Science Worksheet Pdf

Class 7 Science students should refer to the following printable worksheet in Pdf for Acid Bases and Salts in Grade 7. This test paper with questions and solutions for Standard 7 Science will be very useful for tests and exams and help you to score better marks

Class 7 Science Worksheet for Acid Bases and Salts

Acid Bases and Salts 
 
ACTIVITY- 5.2 : To understand the process of neutralization.
 
Question 1- What will be the color of basic solution after the addition of phenolphthalein?
Answer- Pink.
 
Question 2- Name the products of neutralization.
Answer- Salt and water.
 
EXERCISE
 
Question 1- Fill In The Blanks.
 
(i) Acids are sour in taste.
(ii) Litmus and turmeric extract are natural indicators.
(iii) Phenolphthalein is colorless in acidic solution.
(iv) Reaction between an acid and a base is called neutralization reaction.
(v) Ant’s sting has formic acid.
(vi) Excess secretion of hydrochloric acid in stomach, is called acidity.
(vii) Milk of magnesia is used in case of acidity.
 

Question 2- Match The Column ‘A’ With Column ‘B’.

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Question 3. Choose The Correct Answer.
 
(i). Vinegar contains :
a) Acetic acid (✓)   b) Lactic acid   c) Citric acid   d) Tartaric acid
 
(ii). Tamarind contains :
a) Acetic acid   b) Lactic acid   c) Citric acid   d) Tartaric acid (✓)
 
(iii). The example of natural indicator is :
a) Litmus   b) Turmeric extract   c) China rose petals d) All the above (✓)
 
(iv). The color of blue litmus in acidic solution is :
a) Purple   b) Blue   c) Red (✓)   d) Pink
 
(v). Amla contains :
a) Ascorbic Acid (✓)   b) Quick lime   c) Calamine   d) All the above
 

Question 4- Write True Or False.
 
(i) Citric acid is found in tamarind. (False)
(ii) Ant’s sting has oxalic acid. (False)
(iii) Turmeric extract gives reddish brown color in basic solution. (True)
(iv) Sodium hydroxide turns blue litmus red. (False)
(v) Organic matter is used to treat acidic soil. (True)
 

Question 5- Very Short Answer Type Questions.
 
(i) Which acid is secreted in our stomach?
Answer- Hydrochloric acid.
 
(ii) Name any two ant acids.
Answer- Baking soda and milk of magnesia.
 
(iii) What type of substances are used as ant bites?
Answer- Formic acid.
 
(iv) Name any two citrus fruits.
Answer- Orange and lemon.
 
(v) Why is it essential to treat acidic products?
Answer- Because acidic products pollute soil and water.
 

Question 6- Short Answer Type Questions.
 
(i) Name the source from which litmus solution is obtained. What is the use of this solution?
Answer- Litmus solution is obtained from Lichens. Litmus solution is used to test whether a substance is acidic or basic in nature.
 
(ii) Is the distilled water acidic/basic/neutral? How would you verify it?
Answer- Distilled water is neutral and one can easily test it with the help of litmus paper. When we dip blue or red litmus paper in distilled water, there will not be any change in the color.
 
(iii) Describe the process of neutralization with the help of an example.
Answer- When an acid is mixed with a base, and then they react with each other to form the salt and water with the release of energy and cancel each other's effect. This process is neutralization process.
                          Acid + Base → Salt + Water + Heat
Example:
NaOH + HCl → NaCl + H2O + Heat
 
(iv) Name any two common acids and two common bases.
Answer-
Acids- Citric acid, hydrochloric acid, sulphuric acid.
Bases- Sodium hydroxide, Magnesium hydroxide, Calcium hydroxide.
 
(v) What are indicators? Write their types and two examples of each.
Answer-
Indicators- These are special type of substances used to test whether a substance is acidic or basic.
Indicators give different color in acid and base.
Types- (1) Natural Indicators- Litmus, turmeric, china rose petals etc.
(2) Synthetic Indicators- Phenolphthalein, methyl orange etc.
 

Question 7- Long Answer Type Questions.
 
(i) State differences between acids and bases.
Answer-
                Acids                                                                             Bases
1. They are sour in taste.                                                 1. They are bitter in taste.
2. They change blue litmus into red.                                2. They change red litmus into blue.
3. They turn china rose extract dark pink.                      3. They turn china rose extract dark green.
4. They give no color change with phenolphthalein.      4. They give pink color with phenolphthalein.
5. For example lemon and orange have acid.                  5. For example soap and baking soda are bases.
 
(ii) Name the acid present in (i) Vinegar, (ii) tamarind, (iii) citrus fruits and (iv) curd.
Answer- (i) Vinegar- Acetic acid.
(ii) Tamarind- Tartaric acid.
(iii) Citrus fruits- Citric acid.
(iv) Curd- Lactic acid.
 
(iii) You are given hydrochloric acid solution, sodium hydroxide solution and water in three different bottles. How would you check which bottle has which compound?
Answer- We will take three turmeric indicator paper strips. Then we will put some drops from all the three solutions on different strips. The solution which turn the turmeric indicator red, is basic i.e. sodium hydroxide.
Now put some drops from other two bottles on this red paper. The solution which turns this red turmeric paper to yellow is acidic i.e. hydrochloric acid. Remaining solution is water which does not change the color of turmeric indicator in both conditions.


            Questions

            Very Short Answer

Q1)      What are neutral solutions?

Q2)      Where we find the oxalic acid?

Q3)      Define phenolphthalein?

Q4)      Where we find potassium hydroxide?

Q5)      Define neutralisation?

           

            Short Answer

Q6)      What is the effect of the indicator on acidic basic and neutral solution

Q7)      What do you understand by the term indicators?

Q8)      How does litmus detect acidic and basic solution?

Q9)      How acids are different form salts?

Q10)    What is china rose and why it is used as indicators

           

            Long Answer

Q11)    Explain neutralisation in everyday life?

Q12)    How litmus paper is different from pH paper?

Q13)    State the difference between acid and base?

Q14)    Explain about the natural indicators around us?

Q15)    Distinguish between acidic salt and basic salts?

  

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