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Materials Metals and Non Metals Test - 28

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Materials Metals and Non Metals Test - 28
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  • Question 1
    1 / -0
    Which one of the following is a non-metallic mineral ?
    Solution
    Mica is a nonmetallic mineral that is based on a collection of silicates. Non-metallic minerals are those which don't give new products on melting. 
  • Question 2
    1 / -0
    Which one of the following statement, about glass is not correct ?
    Solution
    Glass is called a super cooled liquid because it doesn't form a crystalline structure. The supercooled liquid is a liquid whose temperature is below its freezing point. Pyrex glass is  a mechanically stronger and harder than soda lime.  It is scratch resistant.
  • Question 3
    1 / -0
    Which of the following metals corrodes readily in moist air? 
    Solution
    Iron metal corrodes readily in moist air. The reaction with moist air is as follows: 

    $$ Fe +O_2+H_2O/H^{+} \rightarrow \underset{\text{Rust}}{Fe_2O_3 .xH_2O} $$
  • Question 4
    1 / -0
    Which of the following element does not occur in liquid state?
    Solution
    Lithium is solid at room temperature and rest all other elements exist as liquids at room temperature.
  • Question 5
    1 / -0
    When metallic copper comes in contact with moisture, a green powdery/pasty coating can be seen over it. This is chemically known as
    Solution
    When metallic copper comes in contact with moisture, a green powdery/ pasty coating can be seen over it. This is chemically known as basic copper carbonate or copper carbonate - copper hydroxide.

    $$ Cu +O_2 +CO_2 +H_2O \rightarrow Cu(OH)_2. CuCO_3 $$
  • Question 6
    1 / -0
    Which of the following is not a metal?
    Solution
    Sulphur is a non metal and rest all are metals.
    Hence, option "C" is correct answer.
  • Question 7
    1 / -0
    Amit has learned that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?
    Solution
    Piece of coal when struck with a hammer breaks into pieces. So it's a non - metal.

    Hence "Option D" is the correct answer.
  • Question 8
    1 / -0
    Metals generally react with dilute acids to produce hydrogen gas . Which one of the following metals does not react with dilute hydrochloric acid?
    Solution
     Less reactive metals  such as silver, copper, gold etc don't react with dilute hydrochloric acid. So, these metals do not produce hydrogen gas.
    Hence, option "D" is correct answer.
  • Question 9
    1 / -0
    The substance that will be flattened on beating with a hammer is:
    Solution
    Only metals flattened on striking hammer over it. Non-metals break into tiny pieces when we strike it with a hammer. Thus, zinc granule will get flattened while hammered.

    Hence, "Option D" is correct answer.
  • Question 10
    1 / -0
    An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following 
    Solution
    Hint: Generally alkali metals are soft and can be cut with a knife and are highly reactive.

    Step 1: Alkali metals like sodium, potassium, etc are soft and can be easily cut with a knife. They are highly reactive metals and undergo combustion when exposed to air. These metals react vigorously even with cold water. So, they are stored in kerosene oil.

    Step 2: 
    A. Magnesium (Mg) is a soft metal that can be cut with a knife but it does not react significantly with cold water.  
    B. Sodium (Na) is a soft alkali metal that can be cut with a knife and reacts vigorously with cold water.  
    C. Phosphorous (P) is a non-metal and its allotropes can be cut with a knife and reacts with water at high temperature in steam form.
    D. Calcium (Ca) is a soft metal that can be cut with a knife but not as easily as sodium. Even it does not react so vigorously with cold water and is not so reactive like sodium in air. 

    Step 3: Sodium is a soft metal and highly reactive because of the loosely bonded single valence electrons. The reaction of sodium with air and water are as follows:
    $$4Na(s)+O_2(g)\to 2Na_2O(s)$$  ----- with air
    $$2Na(s)+H_2O(l)\to 2NaOH(aq)+H_2(g)$$  ---- with water

    Final step: So, the correct option is (B) Na.
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