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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Mention Two Uses of the Following Metals and Non-metals Iodine - Chemistry

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प्रश्न

Mention two uses of the following metals and non-metals 

Iodine    

एका वाक्यात उत्तर

उत्तर

It is used in photographic films in the form of potassium iodide.
It is added to salt to make it iodized salt which is necessary for the growth of human body.

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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 3.5

संबंधित प्रश्‍न

Fill in the blanks:

Metals react with acids to produce _________ gas.


Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.

(a) How will she find the nature of the gas?

(b) Write down word equations of all the reactions taking place in this process.


Fill in the following blanks with suitable words:

A metal having low melting point is ..................... but a non-metal having very high melting point is ..............


State one use of Silver.


What is an amalgam?


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


Which property of 'solder' alloy makes it suitable for welding electrical wires?


What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.


Give two uses of Germanium  


A metal with melting point less than 50°C is


Write ‘True’ or ‘False’ in front of following statement. 

Magnesium is used in making light weight alloys of aluminium. 


Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:

Sulphuric acid


When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.


What is it made from? Why?

Electric cables


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

Magnesium


Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.


Name the following:

The chemical compound responsible for the green deposit on the surface of articles of copper.


What is ductility?


Give reasons for the following.

  1. Aluminum foils are used to wrap food items.
  2. Immersion rods for heating liquids are made up of metallic substances.
  3. Sodium and potassium are stored in kerosene.
  4. Mercury is used in thermometers.

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


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