IAT 1-CY8151-Engg. Chemistry-Part B

1.Hardness of water does not

• have any bad effect in boiler
• make cooking of foods difficult
• make it unfit for drinking
• cause difficulty in the washing of clothes with soaps

2.Both temporary and permanent hardness of water can be removed by

• boiling
• distillation
• filtration
• decantation

3.Which one of the following compounds does NOT cause hardness in water?

• Magnesium chloride
• Calcium chloride
• Magnesium sulfate
• Sodium chloride

4.During reverse osmosis:

• dissolved salts are pushed out through semipermeable membrane
• only dissolved ionic salts are pushed out through the semipermeable membrane
• pure water is pushed out through semipermeable membrane
• both water and dissolved salts are pushed out through the semipermeable membrane

5.Internal treatment of boiler feed water involves:

• to precipitate the scale forming substances in the form of sludge
• to convert the scale forming substances into soluble substances
• both of the above
• none of the above

6.Zeolite softening process removes

• only temporary hardness of water
• only permanent hardness of water
• both temporary and permanent hardness of water
• the dissolved gases in permanent hard water

7.Which of the following statement is incorrect about the demineralised water?

• It is as pure as distilled water
• It is very good for use in high pressure boilers
• It is fit for domestic use
• It can be made either by distillation or by using cation and anion exchangers

8.At the equilibrium position in the process of adsorption ___________.

• ∆H > 0
• ∆H = T∆S
• ∆H > T∆S
• ∆H < T∆S

9.Which of the following is not a favourable condition for physical adsorption?

• high pressure
• negative ∆H
• higher critical temperature of adsorbate
• high temperature

10.Select the incorrect statement about the adsorption theory from the following option.

• The surface of the solid catalyst possess some isolated active centres having residual affinity
• Due to these centres, the molecules of the gaseous reactants get adsorbed in unimolecular thick layer
• The adsorbed reactants get activated and then react
• The energy required for activation is more than that required for uncatalysed reaction