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प्रश्न
What are noble gases
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उत्तर
The elements in group 18 of the periodic table, which do not combine with other elements are known as noble gases. These elements are helium, neon, argon, krypton, xenon and radon.
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संबंधित प्रश्न
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
Describe the reaction of potassium with water. Write the equation of the reaction involved.
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
Write the equation for the reaction of Iron with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
A basic oxide will be formed by the element:
(a) K
(b) S
(c) P
(d) Kr
The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur
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.
CuSO4(aq) + Fe(s) → FeSO4(aq) + Cu(s)
FeSO4(aq) + Zn(s) → ZnSO4(aq) + Fe(s)
On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.
Write the name and formula of a molecule made up of three atoms of oxygen.
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
The substance that will be flattened on beating with a hammer is ______.
