71. Which of the following potassium compounds is known as 'Pearl ash' ?

1. 1. K₂SO₄

   
   
   

   2. K₂CO₃

   
   
   

   3. KMnO₄

   
   
   

   4. KOH

   
   
   

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   NA

   Correct Option: B

   NA

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72. Which of the following is a carbonate ore ?

1. 1. cassiterite

   
   
   

   2. pyrolysite

   
   
   

   3. diaspore

   
   
   

   4. malachite

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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73. The aqueous solution containing which one of the following ions will be colourless ?

1. 1. SC³⁺

   
   
   

   2. Fe³⁺

   
   
   

   3. Fe²⁺

   
   
   

   4. Mn²⁺

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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74. Which of the following is highly corrosive salt ?

1. 1. FeCl₂

   
   
   

   2. HgCl₂

   
   
   

   3. PbCl₂

   
   
   

   4. Hg₂Cl₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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75. Malachite is a mineral of

1. 1. Mg

   
   
   

   2. Cu

   
   
   

   3. Al

   
   
   

   4. Fe

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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