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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Give Reasons Tungsten is Used in Electric Bulbs. - Chemistry

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प्रश्न

Give reasons 

Tungsten is used in electric bulbs. 

एका वाक्यात उत्तर

उत्तर

It is a shiny grey metal, in solid state at room temperature. It can withstand high temperature because it has highest melting point among metals. Hence, it is used in electric bulbs.

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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 4.7

संबंधित प्रश्‍न

Explain the meaning of malleable.


Name the non-metal which is used  in the vulcanisation  of rubber.


State one use of Carbon (as Graphite).


Name the metal which is the best conductor of heat and electricity.


How do non-metals react with oxygen? Explain with an example. Give equation of the reaction involved. What is the nature of the product formed? How will you demonstrate it?


Name a non-metal that is used for cancer therapy 


Name the metals present in the following alloys  

Brass  


Match the statements in Column A, with those in Column B .

   Column A   Column B 
1 A metal used for making high quality mirrors . a Chlorine 
2 A metal which neither malleable nor ductile.  b Graphite 
3 A non-metal,used in the sterilsation of water.  c Iodine 
4 A non-metal, whose deficiency can lead to disease like goitre.  d Silver 
5  A non -metal which can be used as dry lubricant.  Zinc

Name a non-metal which is liquid form at room temperature.


Give the balanced reactions for the following:

Red hot iron reacts with steam


Complete the table.

 Property of metal  Use in everyday life
 i. Ductility  
 ii. Malleability  
 iii. Conduction of heat  
 iv. Conduction of electricity  
 v. Sonority  

What are the metals that make the alloys brass and bronze?


Give the common name and chemical name of an ore of:

(a) zinc (b) aluminium (c) iron.


With reference to the physical properties of metals and non-metals, state the following exception.

A non-metal which has low tensile strength


Give reason for the following:

Rusting reduces the structural strength of iron.


The sound of one metal colliding with another makes a noise, this property is called as _______.


Find the odd one out and give its explanation.


Give two examples of alloy.


The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?


Paheli bought a statue made up of copper. To her surprise, it acquired a dull green coating after a couple of months. Explain the reason.


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