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प्रश्न
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
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उत्तर
(d) calcium
Calcium lies above the other three metals in reactivity series.
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संबंधित प्रश्न
Name the following:
Metals which forms an amphoteric oxide.
Differentiate between metal and non-metal on the basis of their chemical properties.
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
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?
Complete and balance the following equation:
Na + O2 →
Fill in the following blank with suitable word:
Calcium is a ................. reactive metal than sodium.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
What is the nature of the oxide Na2O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O
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.
When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?
What are noble gases
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
