why should curd and sour substances not be kept in brass and copper vessels?
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Why are aluminium and copper metals used for making cooking vessels?
Aluminium and copper metals are used for making cooking vessels because they are good conductors of heat and they have high melting points.
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You might have seen lemon or tamarind juice being used to clean tarnished surface of copper vessels.
Lemon juice contains citric acid and tamarind contains tartaric acid. These acids react with a basic layer of copper carbonate on the surface to form soluble salts which are easily removed...
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You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice.
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Acids are the substances which turn blue litmus solution red and are sour in taste. There are different types of acids like mineral acids,
(i) The acids which are obtained from plants and animals are called organic acids. Citric acid is obtained from the lemon. Vinegar contains acetic acid. (ii) Concentrated acids are very hot when they...
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When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ____________.
(iii) sulphides of copper (I) and iron (II)
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What do you think is the color of 'sour cream'?
The 'sour cream' may indicate a dirty yellowish color. The poet uses the expression 'sour cream walls' to represent the color as well as the foul smell emitted by the...
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What substance/substances are transported in plants by : (a) xylem vessels and tracheids ? (b) sieve tubes (or phloem) ?
(a) Water. (b) Food.
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Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels) ?
Curd and other sour substances contains acids which can react with the metals of brass and copper vessels to form toxic (poisonous) metal compounds which can cause food poisoning and...
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(a) What is meant by ‘environment’ ? (b) What type of substances are the major pollutants of the environment ? Name two such substances.
(a)The physical and biological world together is called environment. (b) The non- biodegradable wastes pollutes the environment like plastic and polythene bags. (c) Human beings are the only organisms which change the...
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Both brass and bronze contain copper as major constituents Name other elements in these alloys.
The other element in Brass is Zinc. The other elements in Bronze are Tin and Zinc.
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