हिंदी
सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Mention Two Uses of the Following Metals and Non-metals Gold

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प्रश्न

Mention two uses of the following metals and non-metals  

Gold 

एक पंक्ति में उत्तर
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उत्तर

It is used for making ornaments and coins.
It is used in the manufacture of electronic devices like computers, telephones, home appliances, etc.

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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 3.3

संबंधित प्रश्न

What happens when Dilute sulphuric acid is poured on a copper plate?

Write word equations of the reactions involved.


State one use of Mercury.


Name an alloy of lead and tin.


Fill in the following blank with suitable word:

The electrical conductivity and melting point of an alloy is ........... than that of pure metals.


How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?


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 ________


Statements given below are incorrect. Write the correct statements : 

Bronze is a mixture of 10% copper, 80% zinc and 10% tin.  


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

Oxygen


Write name. 

 The reagent that dissolves noble metals.


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


What is it made from? Why?

Ornaments


Halogen reacts with acid.


The metal which is liquid at room temperature is ______.


Metals are usually solids or gases at room temperature.


Give an example of a metal which

  1. is liquid at room temperature.
  2. is the best conductor of heat.

Name two soft metals which can be cut with a knife.


In the following figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.

  1. ______  is a metal.
  2. Metals are good ______ of electricity. 

Why are metalloids called semimetals?


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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