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प्रश्न
Give reasons
Magnesium is used in fire works.
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उत्तर
Magnesium is used in fire works because it bums with a dazzling light.
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संबंधित प्रश्न
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Sodium is a very reactive metal. ( )
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Copper displaces zinc from zinc sulphate solution. ( )
What is a thermite reaction? Explain with the help of an equation. State one use of this reaction.
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
What is an alloy? How is an alloy made?
Statements given below are incorrect. Write the correct statements :
Bronze is a mixture of 10% copper, 80% zinc and 10% tin.
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
Write ‘True’ or ‘False’ in front of following statement.
Magnesium is used in making light weight alloys of aluminium.
Tick (√) the most appropriate answer.
Graphite is used :
Name a metal which is not malleable :
State the position of the following in the periodic table:
Aluminium
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Why is hydrogen placed with alkali metals?
With reference to the following metals state their use in daily life metal:
iron
Soft metal : Na : : hard metal : _______
Electronic configuration of metal A is 2,8,1. Electronic configuration of metal B is 2,8,8,2. Which of the above metals is more reactive? Explain with reason.
The liquid metal at room temperature ______.
Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
Which metal has the highest ductility?
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the metallic element.
