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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Fill in the Blank : the Most Ductile Metal Is .................... - Chemistry

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प्रश्न

Give two uses of Germanium  

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उत्तर

  • Germanium is used as a semiconductor.
  • It is used as a transistor in many electronic applications when mixed with arsenic, gallium, antiomony, etc.
  • Germanium is also used to form alloys and as a phosphor in fluorescent lamps
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अध्याय 6: Metals and Non-metals - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 6 Metals and Non-metals
Exercise | Q 8.4

संबंधित प्रश्न

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Copper displaces zinc from zinc sulphate solution. ( )


Write the name and formulae of  a metal hydride.


The atomic number of an element Y is 16.
(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?


Name two alloys of iron. What elements are present in these alloys?


Fill in the blank 

A metal that gives dazzling effect to crackers when they explode is ______


Write ‘true’ or ‘false’ for the following statement. 

Iodine acts as an antiseptic in the form of a tincture of iodine. 


Statements given below are incorrect. Write the correct statements : 

Zinc is used for making power transmission wires.  


Why is hydrogen placed with alkali metals?


Write name. 

 The reagent that dissolves noble metals.


Write scientific reason.

Anodes need to be replaced from time to time during the electrolysis of alumina.


Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X


With reference to the following metals state their use in daily life metal:

Lead


Aluminium: _______: gold : : electric insulator


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Can you store pickle in an aluminium utensil? Give reason.


The ability of metals to be drawn into thin wire is known as


An element forms an oxide A2O3 which is acidic in nature. Identify A as a metal or non-metal.


The typical shine of metals is called ______.


Match the following

i. Silica a. Caustic potash
ii. Potassium hydroxide b. Sand
iii. Sodium hydroxide c. Calamine
iv. Zinc carbonate d. Caustic soda

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