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प्रश्न
Silver articles become black on prolonged exposure to air. This is due to the formation of
विकल्प
Ag3N
Ag2O
Ag2S
Ag2S and Ag3N
उत्तर
Ag2S
Explanation -
Silver objects corrode slowly in the air due to the presence of hydrogen sulphide which reacts with silver articles to form a black coloured chemical compound silver sulphide.
`4"Ag"("s") + 2"H"_2"S"("g") + "O"_2("g") -> 2"Ag"_2"S"("s") + 2"H"_2"O"("l")`
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संबंधित प्रश्न
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
What are amphoteric oxides?
Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
Which of the following reacts with cold water vigorously?
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is
Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?
Material: Copper wire, Iron nail, Beaker or Big test tube.
Chemicals: Ferrous Sulphate and Copper Sulphate Solution.
- Which reaction you will study with the help of the above material and solutions? Draw the diagram of the experiment arrangement.
- How do you identify that the reaction is carried out?
- Which type of reaction did you observe?
Answer the questions based on the figure below:
- Which experiment setup is demonstrated in the figure?
- What do you conclude after the reactions? Name reaction.
Keerti added dilute Hydrochloric acid to four metals and recorded her observations as shown in the table given below:
| Metal | Gas Evolved |
| Copper | Yes |
| Iron | Yes |
| Magnesium | No |
| Zinc | Yes |
Select the correct observation(s) and give chemical equation(s) of the reaction involved.
