HARD
7th CBSE
IMPORTANT
Earn 100

Match the given columns:
Column A
Column B
Column C
1.
Dilute hydrochloric acid
(i)
China rose
(a)
Yellow
2.
Vinegar
(ii)
Blue litmus
(b)
Blue
3.
Dilute calcium hydroxide
(iii)
Phenolphthalein
(c)
Red
4.
Curd
(iv)
Turmeric
(d)
Colourless
5.
Soap
(v)
Red litmus
(e)
Green

Important Questions on Different Kinds of Materials
MEDIUM
7th CBSE
IMPORTANT
Atul was given a colourless solution in a test tube. He put a drop of this solution on blue litmus paper. It remained blue in colour. The colourless solution is

MEDIUM
7th CBSE
IMPORTANT
A solution turns red litmus paper blue. If a drop of phenolphthalein is added to it,

MEDIUM
7th CBSE
IMPORTANT
Which of the following statement is true?

MEDIUM
7th CBSE
IMPORTANT
Orange juice is sour in taste due to presence of

MEDIUM
7th CBSE
IMPORTANT
Which of the following is added to the soil if it is too basic?

HARD
7th CBSE
IMPORTANT
Across
2. A base present in soap (6, 9)
4. An indicator which is used as a food ingredient (8)
5. Relieves from indigestion (7)
6. An indicator obtained from Lichen (6)
9. Soluble base ( 6)
10. An indicator which is green in colour in basic medium (5, 4)
12. An acid present in an ant sting ( 6)
Down
1. Reaction between an acid and a base (14)
3. Tests chemical nature of substances (9)
7. Bitter in taste and soapy to touch ( 4)
8. Sour in taste ( 4)
11. A product of neutralization reaction ( 4)
