46. Dry powder extinguishers contains

1. 1. Sand

   
   
   

   2. San + baking soda

   
   
   

   3. Sand + Na₂CO₃

   
   
   

   4. Sand + K₂CO₃

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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47. Percentage of lead in lead pencil is

1. 1. Zero

   
   
   

   2. 20

   
   
   

   3. 40

   
   
   

   4. 80

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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48. Which of the following oxide is neutral ?

1. 1. CO

   
   
   

   2. SiO₂

   
   
   

   3. ZnO

   
   
   

   4. P₂O₅

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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49. Which one is the formula of bleaching powder ?

1. 1. CaCI₂

   
   
   

   2. CaO₂CI₂

   
   
   

   3. CaOCI₂

   
   
   

   4. CA(OCI)₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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50. Chemically phosgene gas is

1. 1. Carbonyl sulphide

   
   
   

   2. Carbonyl chloride

   
   
   

   3. Phosphine

   
   
   

   4. Nickel carbonyl

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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