Question: Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?

• 1. Silicon carbide
• 2. Silicon nitride
• 3. Crystalline magnesia
• 4. Zirconium sulphate

Question: Pick out the wrong statement?

• 1. Sand & coke is the main raw material for the manufacture of silicon carbide
• 2. Carbon refractories cannot be used in the furnaces operating under reducing conditions
• 3. Mullite can be obtained by the heating of alusite, kyanite or sillimanite
• 4. Silica occurs in nature in all cellular, amorphous or crystalline form

Question: The total number of atoms in 8.5 gm of NH3 is _______________ × 1023?

• 1. 9.03
• 2. 3.01
• 3. 1.204
• 4. 6.02

Question: The heat capacity of a substance is ____________________?

• 1. Greater for liquid state than for solid state
• 2. Lower for liquid state than for gaseous state
• 3. Higher for solid state than for liquid state
• 4. Equal for solid and liquid states below melting point

Question: If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?

• 1. N
• 2. N/2
• 3. 2N
• 4. 4N

Question: Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

• 1. Chlorine
• 2. Nitrogen
• 3. Ethane
• 4. All the gases will have the same KE

Question: In a chemical process, the recycle stream is purged for______________________?

• 1. Increasing the product yield
• 2. Enriching the product
• 3. Limiting the inerts
• 4. Heat conservation

Question: pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?

• 1. 0
• 2. 10
• 3. 7
• 4. 14

Question: The heat of solution depends upon the____________________?

• 1. Nature of solvent
• 2. Concentration of solution
• 3. Nature of solute
• 4. All A, B & C

Question: Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?

• 1. Mixing
• 2. Adsorption
• 3. Wetting
• 4. Complete wetting