CBSE Class 7 - Science - Acids, Bases and Salts (Worksheet) (#eduvictors)(#cbseClass7Science)

Acids, Bases and Salts (Worksheet)CBSE Class 7 - Science 

Direction: Fill in the blanks in the following sentences.

1. _______ are substances having a sour taste.


2. Substances that are bitter in taste and soapy to touch are _______ in nature.


3. Chemicals that are used to check acidic or basic nature of substances are called __________.


4. Acids turn ______ litmus to _____ .


5. Turmeric paste and China rose are also _________ indicators. Turmeric paste remains yellow in acidic solutions but turns to ________ in basic solutions.



6. _________ substances do not affect the colour of indicators.


7. When an acid is mixed with a base, it produces salt and water. This type of reaction is called _________ reaction.


8. Acid present in vinegar is _________.


9. Acid present in Lemon and orange is ________.


10. Acid present in curd is __________.


11. Lime water, baking soda and soap are the exampls of _________.


12. Chemical name of lime water is _____________.


13. When sodium hydroxide (NaOH) is treated with hydrochloric acid (HCl), then a salt, _____________ and water (H2O) are obtained.


14. Chemical name of Baking soda is ___________ ____________, which on heating gives _________ gas. This gas makes dough rise and fluffy.


15. To get relief from acidity, milk of magnesia, a mild base is used as a/an ________.


16. Excessive use of chemical fertilizers makes the soil ________. So, it is treated with quicklime.


17. Calamine is a ________, it contains zinc ________.


Answers:
1: acid
2: basic
3: indicators
4:  blue, red
5: natural, red
6:  Neutral
7:  neutralisation
8:  acetic acid
9: citric acid
10: lactic acid
11: bases
12: Calcium Hydroxide
13: sodium chloride (NaCl)
14: Sodium Hydrogen Carbonate, Carbon Dioxide
15:  antacid
16. acidic
17. base, carbonate

Lemons contain citric acid.

☞See also:

Ch 5 Acids, Bases and Salts(Q & A)
Ch 5 Acids, Bases and Salts(MCQs)

Ch 6 Physical and Chemical Changes(Q &A)
Ch 6 Physical and Chemical Changes (MCQs)