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प्रश्न
Name a metal for the given case:
It does not react with any physical state of water.
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उत्तर
Copper
APPEARS IN
संबंधित प्रश्न
_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
‘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 equations for the reactions of calcium and potassium with water.
Write the chemical reaction when iron reacts with dilute H2SO4.
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
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.
What name is given to those metal oxides which show basic as well as acidic behaviour?
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.
Can we keep sodium immersed under water? Why?
Write the equation for the reaction of:
Iron with dilute hydrochloric acid.
Name the products formed in the given case. Also indicate the physical states of all the substances involved.
The elements whose oxides can turn phenolphthalein solution pink are ______.
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.
- What is the nature of oxide A2O3?
- What is the nature of oxide BO?
- Name one metal like A.
- Name one metal like B.
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
Choose the correct alternative and rewrite the following:
Reaction of iron nails whith copper sulphate solution is an example of _____________________
Write the chemical equation of the above process.
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
Why is acidified water considered to be a good conductor of electricity?
