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प्रश्न
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.
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उत्तर
(a) The oxide A2O3 is amphoteric, which can react with both acids and bases to form salt and water.
(b) The oxide BO is amphoteric, which can react with both acids and bases to form salt and water.
(c) Aluminium is a metal like A, which forms Al2O3 on reacting with oxygen.
(d) Zinc is a metal like B which forms ZnO on strongly heating in air (oxygen).
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संबंधित प्रश्न
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
Why is sodium kept immersed in kerosene oil?
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
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:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
Write equation for the reaction of magnesium with oxygen.
Give reason for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Fill in the following blank with suitable word:
Magnesium liberates ............... gas on reacting with hot boiling water.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
What is the action of water on magnesium ? Write equation of the chemical reaction involved.
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
Write the equation for the reaction of Zinc with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide
A metal less reactive and another metal more reactive than hydrogen are:
(a) aluminium and lead
(b) iron and magnesium
(c) copper and tin
(d) copper and mercury
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg
Arrange the following metals in the increasing order of their reactivities:
Copper, Zinc, Aluminium, and Iron
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following.
