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Write scientific reason. Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish. - Science and Technology 1

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प्रश्न

Write scientific reason.

Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.

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उत्तर

  1. The greenish colour on copper vessels is due to the formation of copper carbonate on it.
  2. Copper carbonate reacts with acids present in lemon or tamarind and as a result, this copper carbonate layer gets removed.
    Hence, Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.
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अध्याय 8: Metallugy - Write scientific reasons

संबंधित प्रश्न

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

Sodium is a very reactive metal. ( )


Mention two uses of the following metals and non-metals  

Gold 


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

Salt of silver, such as ________ is used for making photographic films.


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 ________


Name a metal which is not malleable : 


State two important uses of following metal: 

Uses of gold  


State the position of the following in the periodic table:

Iron and zinc


Give the general characteristics of:

Alkali metals,

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


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

Hydrochloric acid,


State the position of the following in the periodic table:

Halogens


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

copper


Name the following:

A metal used in packaging.


Name the following:

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


Electronic configuration of metal A is 2,8,1. Electronic configuration of metal B is 2,8,8,2. Which of the above metals is more reactive? Explain with reason.


Higher Order Thinking Skills.

Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.

  1. Formulate a hypothesis based on the information provided.
  2. Briefly state how you would test the hypothesis.

Which of the following two combinations are correct?

 

  Metal Gas Evolved
(i) Copper Yes
(ii) Iron Yes
(iii) Magnesium No
(iv) Zinc Yes

Which one of the following metals do not react with cold as well as hot water?


In the given 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. 

The typical shine of metals is called ______.


Why are metalloids called semimetals?


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