04
2) Calculum, phosphorous
Sodium, phosphorus
(4) Clacium, iron
Sodium, ron
4. Who proved first that th part of air is Oxygen?
1 Priestley
ex (2) Lavoisier
@ Lavoisier (0) Karlse
(3) Karl Scheele (4) Cave
47. Which solution turns red lithus blue?
(1) Tap water () Lime juice (3) Soap water (4)
24. Which substance dissolves the most in water ?
(1) Sugar
(2) Salt
) Ammonium nitrate
(4) Copper sulphate
49. Which is the important characteristic of gobar gas?
I r is lighter than air
(2) It is colourless
0) It is odourless
(4) It is combustible
2. Which of the following threads is natural ?
(1) Nylon (2) Polyester (3) Silk (4) Tem
Answers
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1
Answer:
copper sulphate
it is combustible
silk
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