Chemical composition of some matter is in the fallowing table .Identify the main type of matter from their. Name of matter Chemical composition Main type of matter Sea water Distilled water Hydrogen gas filled in a balloon The gas in LPG cylinder Baking soda Pure gold The gas in oxygen cylinder Bronze Diamond Heated white powder of blue vitriol Lime stone Dilute hydrochloric acid

H2O + NaCl + MgCl2+...

H2O

H2

C4H10 + C3H8

NaHCO3

Au

O2

Cu + Sn

C

CuSO4

CaCO3

HCl + H20


H2O + NaCl + MgCl2+...
H2O
H2
C4H10 + C3H8
NaHCO3
Au
O2
Cu + Sn
C
CuSO4
CaCO3
HCl + H20

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Solution

1.sodium chloride
2. Water
3.hydrogen
3.butane

4.sodium bicarbonate
5.gold
6.oxygen
7.copper
8.copper
9.copper sulphate
10.calcium carbonate
11. Hydrochloric acid

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Q. Chemical composition of some matter is given in the following table. Identify the main type of matter from their.

Name of matter	Chemical composition	Main type of matter
Sea water	$H_{2} O + N a C l + M g C l_{2}$
Distilled water	$H_{2} O$
Hydrogen gas filled in a ballon	$H_{2}$
The gas in LPG cylinder	$C_{4} H_{10} + C_{3} H_{8}$
Baking soda	$N a H C O_{3}$
Pure gold	$A u$
The gas in oxygen cylinder	O₂
Bronze	Cu + Sn
Diamond	C
Heated white powder of blue vitroi	CuSO₄
Lime stone	CaCO₃
Dilute hydrochloric acid	HCL+ H₂O

Q. When a student adds some dilute hydrochloric acid to baking soda taken in a test-tube, a gas is evolved.
(a) Name the gas evolved.
(b) How can this gas be tested?

Q. A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was passed through lime water. What change would be observed in lime water? Write balanced chemical equations for both the changes observed

A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water . What change would be observed in lime water ? What will happen if excess gas is passed through the lime water ? With the help of Balanced chemical equation for all the changes explain the observation.

(i) State reasons for the following statements:

(a) Tap water conducts electricity, whereas distilled water does not.

(b) During the summer season, a milkman usually adds a very small amount of baking soda to fresh milk.

(c) For dilution of acid, acid is added into water and not water into acid.

(d) Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does.

(ii) How is Bleaching powder prepared? Give its important uses?

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1.sodium chloride 2. Water 3.hydrogen 3.butane ​​​ ​​​​ 4.sodium bicarbonate 5.gold 6.oxygen 7.copper 8.copper 9.copper sulphate 10.calcium carbonate 11. Hydrochloric acid

1.sodium chloride
2. Water
3.hydrogen
3.butane

4.sodium bicarbonate
5.gold
6.oxygen
7.copper
8.copper
9.copper sulphate
10.calcium carbonate
11. Hydrochloric acid