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प्रश्न
Fill in the following blank with suitable word:
The white powder formed when magnesium ribbon burns in oxygen is of ....................
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उत्तर
The white powder formed when a magnesium ribbon burns in oxygen is magnesium oxide.
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संबंधित प्रश्न
.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen
Write equations for the reactions of iron with steam.
Write the chemical reaction when iron reacts with dilute H2SO4.
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 second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
Write equation for the reaction of magnesium with oxygen.
Complete and balance the following equation:
Which of the following elements would yield an acidic oxide.
Na, S, C, K, H
How do metals react with hydrogen? Explain with an example.
Why is white phosphorus kept immersed under water?
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
What is the action of water on aluminium ? Write equation of the chemical reaction involved.
An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) 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.
(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 a chemical equation to illustrate the use of aluminium for joining cracked railway lines.
Choose the correct alternative and rewrite the following:
Reaction of iron nails whith copper sulphate solution is an example of _____________________
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Arrange the following metals in the increasing order of their reactivities:
Copper, Zinc, Aluminium, and Iron
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
