Question

5)The conversion of vapours to liquid is known as....

6)The combination of calcium and fluorine makes the compound......

7)Oxygen gas contains.... atoms.

8)....gave the laws of chemical combination .

9)SI unit of measuring temperature is...

10)At 373K,water is at... state.

Q4. Match the followings. (5M)

Column A Column B

1)Boron i) Mg

2) Argon ii) Au

3) Zinc iii)Hg

4)Gold iv) B

5)Silver v) I

6)Magnesium vi) Fe

7) Potassium vii) Ar

8)Mercury viii) Ag

9)Iodine ix) Zn

10)Iron x) K​

Answer 1

Answer:

5)Condensation

6)calcium fluoride

7)2 atoms of Oxygen

8)Antoine Lavoisier and Jospeh proust

9)Kelvin

10)Gaseous

Match the following

Boron – B

Argon– Ar

Zinc– Zn

gold Au

silver – Ag

magnesium –Mg

potassium –K

Mercury–Hg

iodine–I

Iron –Fe