The brown surface of copper becomes black onheating in air. When hydro – InterviewSolution

InterviewSolution

1.	The brown surface of copper becomes black onheating in air. When hydrogen gas is passed overthis black surface, it turns
Answer» The brown surface of copper becomes black onheating in air. When hydrogen gas is passed overthis black surface, it turns

Discussion

No Comment Found

Related InterviewSolutions

The effervescence when vinegar is added to baking soda is due to the evolution of
The colour of residue left behind on heating lead nitrate when it is still hot is :(1) green(2) yellow(3) black(4) reddish-brown
Name any three methods of separating substances in dry conditions, and define them. [3 MARKS]
What is the difference between enthalpy and entropy
What colour is given when acid is added to phenolphthalein?
Which of the following gases is necessary for combustion of a substance?
Following figure shows a _____________________ change.
Rate constant of a first order reaction is 0.0693 min−1. If we start with 20 mol L−1, it is reduced to 2.5 mol L−1 in:(Given log2=0.3010)
Write answer to the following questions.(a) How does the use of a detergent help to clean soiled clothes ?(b) How will you check with the help of soap powder whether water is hard ?(c) What are the important ingredients of a toothpaste , and what is the function of each ?(d) What are the ingredients of cements ?(e) What will happen if cement is not used in making concrete ?(f) Make a list of detergents that you use.(g) What should be expected from a detergent for delicate garments ?(h) What is meant by ' surface activity'? Name three chemicals responsible for the surface activity of various detergents.
Which pair of species has the same percentage of carbon?[1 mark]