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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Statements Given Below Are Incorrect. Write the Correct Statements : Bronze is a Mixture of 10% Copper, 80% Zinc and 10% Tin. - Chemistry

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प्रश्न

Statements given below are incorrect. Write the correct statements : 

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

एका वाक्यात उत्तर

उत्तर

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

 
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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Metals and Non-metals - Additional questions 1

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 6 Metals and Non-metals
Additional questions 1 | Q 2.2

संबंधित प्रश्‍न

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

Generally, non-metals react with acids. ( )


Give a reason for Alkali metals are good reducing agents.


State one use of Mercury.


Name a metal which is not malleable : 


State two important uses of following metal: 

Uses of silver  


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:

Oxygen


Write scientific reason.

Pine oil is used in froth flotation.


The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.


What is it made from? Why?

Pots and pans


Give a reason why a green deposit is seen on the surface of an article of copper


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.

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.

The liquid metal at room temperature ______.


Metals and non–metals are used for making ______, ______ and ______.


All gases are ______.


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

______ is the metallic element.


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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