CBSE-2019
Embibe Experts Science Solutions for Exercise - CBSE-2019
Simple step-by-step solutions to CBSE-2019 questions of Metals and Non-metals from EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.
Questions from CBSE-2019 with Hints & Solutions
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change ? On the basis of this experiment, state which one is the most reactive metal and why.
Give reasons-
Platinum, gold and silver are used to make jewellery.
What are amphoteric oxides? Give an example. Write balanced chemical equations to justify your answer.
Give reason:
Metals like sodium and potassium are stored under oil.
Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the products formed.
Carbon cannot reduce the oxides of sodium, magnesium and aluminium to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
