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प्रश्न
Why are metals called electropositive elements?
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उत्तर
Metals are known as electropositive elements because they can form positive ions by losing electrons.
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संबंधित प्रश्न
Food cans are coated with tin and not with zinc because ______.
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a ‘pop’ sound.
From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal:
- which reacts with water only on boiling, and
- another which does not react even with steam.
Which of the two metals is more reactive?
Copper or silver
Write an equation for the reaction of:
Sodium with oxygen
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Complete and balance the following equation:
\[\ce{Na2O + H2O ->}\]
Complete and balance the following equation:
\[\ce{Cu(NO3)2_{(aq)} + Zn_{(s)} ->}\]
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
How do metals react with hydrogen? Explain with an example.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
An acidic oxide is produced by the element ______.
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
- What is the nature of the oxide E2O?
- State whether element E is a metal or a non-metal.
- Give one example of an element like E.
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
- What is the nature of oxide A2O3?
- What is the nature of oxide BO?
- Name one metal like A.
- Name one metal like B.
What is the characteristic of the electronic configuration of noble gases?
Choose the correct alternative and rewrite the following:
Reaction of iron nails whith copper sulphate solution is an example of _____________________
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
