Question

A small piece of calcium metal is put into a trough containing water.
(a) name the gas formed and how will you test it?
(b) what do you observe when drops of red litmus solution is added to turbid solution?
(c) what happens if dilute Hcl is added to the turbid solution? Give equation for the reaction.

Answer 1

(a) Hydrogen gas is formed when calcium reacts with water.

• Whenever a metal reacts with water, it leads to the formation of metal oxides and liberation of hydrogen gas.
• The released hydrogen gas can be tested by inserting a lighted splint into the test tube.
• If the splint is put off along with a pop sound, it shows the presence of hydrogen gas.
• The chemical equation for the reaction is as follow:

$Ca+2H_2O\rightarrow Ca(OH)_2 + H_2$

(b) The reaction of red litmus solution

• When red litmus solution is added to the turbid solution, the color gets changed into blue.
• It is because the OH ions of calcium oxide ions being base convert the red litmus solution to blue.

(c) The reaction of dilute acid

• When dilute HCl is added to the turbid solution, it reacts with the $Ca(OH)_2$ and leads to the formation of calcium chloride ($CaCl_2$ along with water.
• The equation for the reaction occurring is

$Ca(OH)_2+2HCl\rightarrow CaCl_2+ 2H_2O$

Learn more about such concept

In the electrolysis of water : (i) Name the gas collected at the cathode and anode respectively (ii) Why is the volume of one gas collected at one electrode double that at the other ? Name this gas. (iii) How will you test the evolved gases ?

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Name the gas evolved by reaction of metal with acid .how will you test the presence of this gas?

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Answer 2

(a) Hydrogen gas is formed when calcium reacts with water.

Whenever a metal reacts with water, it leads to the formation of metal oxides and liberation of hydrogen gas.

The released hydrogen gas can be tested by inserting a lighted splint into the test tube.

If the splint is put off along with a pop sound, it shows the presence of hydrogen gas.

The chemical equation for the reaction is as follow:

Ca+2H_2O\rightarrow Ca(OH)_2 + H_2Ca+2H

2

O→Ca(OH)

2

+H

2

(b) The reaction of red litmus solution

When red litmus solution is added to the turbid solution, the color gets changed into blue.

It is because the OH ions of calcium oxide ions being base convert the red litmus solution to blue.

(c) The reaction of dilute acid

When dilute HCl is added to the turbid solution, it reacts with the Ca(OH)_2Ca(OH)

2

and leads to the formation of calcium chloride (CaCl_2CaCl

2

along with water.

The equation for the reaction occurring is

Ca(OH)_2+2HCl\rightarrow CaCl_2+ 2H_2OCa(OH)

2

+2HCl→CaCl

2

+2H

2

O

Learn more about such concept

In the electrolysis of water : (i) Name the gas collected at the cathode and anode respectively (ii) Why is the volume of one gas collected at one electrode double that at the other ? Name this gas. (iii) How will you test the evolved gases ?

https://brainly.in/question/2606110

Name the gas evolved by reaction of metal with acid .how will you test the presence of this gas?

https://brainly.in/question/663326