66. When water vapours are passed over aluminium carbide, we get

1. 1. Acetaldehyde

   
   
   

   2. Ethylene

   
   
   

   3. Methane

   
   
   

   4. Methyl alcohol

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

67. The complete combustion of CH₄ gives

1. 1. CO + H₂

   
   
   

   2. CO + N₂

   
   
   

   3. CO + N₂O

   
   
   

   4. CO₂ + H₂O

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

---

---

68. Liquid benzene (C₆H₆) burns in oxygen according to, 2C₆H₆ (l) + 15O₂ (g) → 12CO→ (g) + 6H→ O (g) How many litre of O→ at STP are needed to complete the combustion of 39 g of liquid benzene ?

1. 1. 11.2 litre

   
   
   

   2. 22.4 litre

   
   
   

   3. 84 litre

   
   
   

   4. 74 litre

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

69. A plastic bakelite is a compound of HCHO with

1. 1. Benzene

   
   
   

   2. Phenol

   
   
   

   3. Ammonia

   
   
   

   4. Hydrocarbon

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

---

70. Which is the correct formula of bleaching powder ?

1. 1. Ca(OCI)CI

   
   
   

   2. CaO(OCI)

   
   
   

   3. Ca(OCI)₂

   
   
   

   4. Ca(OCI)₂CI

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---