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प्रश्न
Can we keep sodium immersed under water? Why?
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उत्तर
No, we cannot keep sodium immersed in water because it reacts vigorously even with cold water to form sodium hydroxide, hydrogen gas and a huge amount of heat.
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) + HEAT
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संबंधित प्रश्न
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
Write the chemical reaction when iron reacts with dilute H2SO4.
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
The solution of Aluminium sulphate in water is .....................
(a) Green
(b) Colourless
(c) Pink
(d) Blue
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
What is the action of water on magnesium ? Write equation of the chemical reaction involved.
Name another metal oxide which behaves like aluminium oxide.
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.
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag
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.
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
Which of the following reactions will not occur? Why not?
(a) MgSO4 (aq) + Cu (s) → CuSO4 (aq) + Mg (s)
(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)
(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg (s)
What is the characteristic of the electronic configuration of noble gases?
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
