INTERVIEW BASED QUESTIONS PART-05

1.What is dry ice?→
→Dry ice is the solid form of carbon dioxide.
     It is used primarily as a cooling agent.

2. Which dryer is used in detergent production?
→Spray dryer

3.Write 2 oxidizing agents and reducing agents.
→Oxidizing agents: - KMnO4 , K2Cr2O7 , H2O2 , OZONE
→Reducing agents: - LiAlH4 , NaBH4 , Na2S2O3 , KI

4.Difference between Reversible and Irreversible chemical reactions.
→In reversible reaction, reactants react to form a new product &  are get back the original product or reactant.While in Irreversible reaction, it’s impossible to get back original product or reactant.

→In reversible reaction, changes take place very slowly through a series of intermediate step in the equilibrium state. While in              irreversible reaction, there is no equilibrium state.

5.Define Fire Point and Flash Point. What is the importance of determination of Fire Point?
→Flash Point: - It is the lowest temperature at which vapour of      fluid will produce a flash by open flame.
→Fire Point: -It is the lowest temperature at which the vapour of  fluid will continue to burn for at least 5 seconds after ignition by open flame.

6.Define Density. Give unit of density.
→Density: - The density of substance is its mass per unit volume.
Unit: - Kg/m3
→Specific Gravity: - It is the ratio of density of sub. to the density  If reference sub.(water).
It is unit less.

7.What is the function of Manometer?
→Manometers are simplest pressure measuring device. They are      used for measuring Low Pressure or Pressure Difference.

8.Give 3 units of Temperature & Pressure.
→Temperature: - 0C , K , 0F
→Pressure: - Pa, N/m2, Kg/m.s2

9.Why Earthing is provided in Solvent line?
→When fluid flows , the static charge will produce. It is enough to  ignite solvent. So there is chance of explosion. To avoid this,While in Irre avoid this,While in irreversible is provided in solvent line.

10. Which acid is present in milk, lemon juice & vinegar?
→In milk - lactic acid (pH = 6.5 – 6.7)
→In lemon juice - Citric acid (pH = 2.0)
→In Vinegar - Acetic acid (5 to 10% Acetic Acid in H2O)

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