Advertisements
Advertisements
Question
Silver articles become black on prolonged exposure to air. This is due to the formation of
Options
Ag3N
Ag2O
Ag2S
Ag2S and Ag3N
Advertisements
Solution
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")`
APPEARS IN
RELATED QUESTIONS
What are amphoteric oxides?
Example of an amphoteric oxide is:
Which of the following metals liberate hydrogen with 5% HNO3?
(i) Cu
(ii) Zn
(iii) Mn
(iv) Mg
Which one of the following metals does not react with cold as well as hot water?
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)?
When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.
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?
Out of three metals, sodium, calcium and aluminium, which metal reacts most with water? Give the equation of reaction with all three metals.
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.
Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
- MgO
- ZnO
- Al2O3
- Cao
Write a chemical equation showing the ionic products formed on dissolving potassium hydroxide in water.
On adding dilute sulphuric acid to a test tube containing a metal ‘X’, a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents the metal ‘X’?
