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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

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

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प्रश्न

Give two uses of Germanium  

टीपा लिहा
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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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पाठ 6: Metals and Non-metals - Exercise

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

संबंधित प्रश्‍न

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

Sodium is a very reactive metal. ( )


State one use of  Iron.


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?


What is an alloy? How is an alloy made?


Give reasons 

Gold is mixed with copper and nickel.  


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. 


Fill in the blank spaces by choosing the correct words from the given list. 

List: amalgam, chlorine, gallium, sodium chloride, silver chloride 

______ is a liquid metal. 

 


Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride 

A solution of a metal in mercury is called ________


Give the general characteristics of:

Alkali metals,

(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid


Write name.
 Alloy of sodium with mercury.


What was Mendeleev's basis for the classification of elements?


Give reasons for the following:
Most metals conduct electricity well.


Name the following:

A metal used in flexible pipes.


Match the columns.

Group A Group B
1) Copper and Zinc a) Brass
2) Copper and Tin b) Bronze
  c) Stainless steel

Complete the following flowchart.


An element which is always lustrous, malleable and ductile is ______.


The most abundant element in the universe is ____________.


Match the following

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

X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:

______ is the reducing agent.


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