Advertisements
Advertisements
प्रश्न
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
उत्तर
Metals can form positive ions easily by losing electrons. So, they are called electropositive elements. Non-metals can form negative ions easily by gaining electrons and so, they are called electronegative elements.
APPEARS IN
संबंधित प्रश्न
Write the chemical reaction when iron reacts with dilute H2SO4.
How do non-metals react with hydrogen? Explain with an example.
Name two metals which cannot displace hydrogen from dilute acids.
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
Name one metal which displaces copper from copper sulphate solution and one which does not.
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O
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.
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?