61. The acid employed for etching of glass is

1. 1. H₂SO₄

   
   
   

   2. HCIO₄

   
   
   

   3. HF

   
   
   

   4. Aqua-regia

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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62. The reducing agent in thermite process is

1. 1. Mg

   
   
   

   2. BaO₂

   
   
   

   3. Al

   
   
   

   4. MnO₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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63. Photographic plates are coated with a film of

1. 1. AgCl

   
   
   

   2. AgBr

   
   
   

   3. Agl

   
   
   

   4. AgNO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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64. Which of the following is known as pseudo alum

1. 1. K₂SO₄.AI₂ (SO₄)₃.24H₂O

   
   
   

   2. KCr(SO₄)₂.12H₂O

   
   
   

   3. KMn(SO₄)₂.12H₂O

   
   
   

   4. NH₄Fe(SO₄)₂.12H₂O

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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65. Which one is Caro's acid ?

1. 1. H₂SO₅

   
   
   

   2. H₂S₂O₈

   
   
   

   3. H₂SO₃

   
   
   

   4. H₂SO₄

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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