Metals and Non-metals (10)
Physical Properties, Chemical Properties - Reaction with Oxygen, Water, Acids; Reactivity Series; Ionic Compounds (Reaction of Metals and Nonmetals); Extraction of Metals; Corrosion and prevention
The melting points and boiling points of some ionic compounds
The melting points and boiling points of some ionic compounds are given below:
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Draw a labelled diagram of the experimental set-up to study the action of steam on a metal
Draw a labelled diagram of the experimental set-up to study the action of steam on a metal. Name the gas produced in the reaction.
The electron dot structure of chlorine molecule is
The electron dot structure of chlorine molecule is :
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Draw a labelled diagram of the set-up of a circuit
Draw a labelled diagram of the set-up of a circuit to show that metals are good conductors of electricity.
The position of metals in the activity series of metals
Which one of the following statements is true about the position of metals in the activity series of metals ?
...A student added few pieces of aluminium metal to two test tubes A and B
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
...How is copper extracted from its sulphide ore
How is copper extracted from its sulphide ore ? Explain the various steps supported by chemical equations. Draw labelled diagram for the
...Write the steps involved in the extraction of pure metals in the middle of the activity series
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Why are alloys commonly used in electrical heating devices
Why are alloys commonly used in electrical heating devices ? Give reason.
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason
What would a student report nearly after 30 minutes of placing duly cleaned strips of aluminium
What would a student report nearly after 30 minutes of placing duly cleaned strips of aluminium, copper, iron and zinc in freshly prepared iron
...What are amphoteric oxides
What are amphoteric oxides ? Give an example. Write balanced chemical equations to justify your answer.
On heating blue coloured powder of copper (II) nitrate in a boiling tube
On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed.
...Silver articles become black when kept in open for some time
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
...Metals like sodium and potassium are stored under oil
Metals like sodium and potassium are stored under oil.
Platinum, gold and silver are used to make jewellery
Platinum, gold and silver are used to make jewellery. Give reason.
Why are the heating elements of electric toasters and electric irons
Why are the heating elements of electric toasters and electric irons made of an alloy rather than a pure metal ?