Why do silver articles turn blackish while copper vessels turn gr… - Vidyadip

Question

Why do silver articles turn blackish while copper vessels turn greenish on keeping in air for long time?

✓

Answer

1. Silver articles turn blackish on exposure to air for a long time. This is because of silver sulphide $\left( Ag _2 S \right)$ laver formed on the silver articles by the reaction of silver with hydrogen sulphide.
2. Carbon dioxide in moist air reacts with copper vessel. Copper loses its lustre due to formation of greenish layer of copper carbonate $\left( CuCO _3\right)$ on its surface.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following questions: [2 M]" from P-1 Metallurgy→P-1 Metallurgy — all question types→Science STD 10 question papers→Maharashtra Board STD 10 question papers→Maharashtra Board question paper generator→

Similar questions

Name two animals having homologous organs and two having analogous organs. Name these organs.

Write structural formulae for the following $\text{IUPAC}$ names.
Propan$-2 :$ Molecular formula $C_3H_7ОН$

Which kind of mirror is used in the headlights of a car? Why is it used for this purpose?

The general molecular formula for the homologous series of alkynes is $\mathrm{C}_n \mathrm{H}_{2 n-2}$. Write down the individual molecular formulae of the first, second and third members by substituting the values 2,3 and 4 respectively for ' $n$ ' in this formula.

Define : Magnetic Separation

Why do stars seem higher than they actually are? Illustrate your answer with the help of a diagram.

What is a catalyst? Write any one reaction which is brought about by use of catalyst.

What are heterotrophs? Give one example of heterotrophs.

By how many $-\mathrm{CH}_2-$ (methylene) units do the formulae of the first two members of homologous series of alkanes, methane $\left(\mathrm{CH}_4\right)$ and ethane $\left(\mathrm{C}_2 \mathrm{H}_6\right)$ differ? Similarly, by how many $-\mathrm{CH}_2$ - units do the neighbouring members ethane $\left(\mathrm{C}_2 \mathrm{H}_6\right)$ and propane $\left(\mathrm{C}_3 \mathrm{H}_8\right)$ differ from each other?

Explain how, sun is considered to be the ultimate source of fossil fuels.