325 7:29 PP Q8. Which one of the following does not involve coagulation? O (a) Peptization 0 (b) Formation of delta regions (c) Treatment of drinking water by potash alum (d) Clotting of blood by the use of ferric chloride

To stop bleeding from an injury ferric chloride can be applied. Which of the following comment (s) about the statement is justified? (a) it is not true, ferric chloride is highly poisonous (b) it is true, Fe^(3+) ions coagulate blood which is negatively charged sol. (c) it is true, coagulation takes place because of formation of negatively charged sol with Cl^- ions (d) it is not true, Cl^- ions form positively charged sol, profuse bleeding takes place (e) it is not true, ferric chloride is ionic and gets into blood stream

Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option. A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air. B. Passage of secondary effluent and formation of activated sludge. C. Physical removal of particles through filtration and sedimentation D. Release of effluent from the secondary treatment plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.

Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option. A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air. B. Passage of secondary effluent and formation of activated sludge. C. Physical removal of particles through filtration and sedimentation D. Release of effluent from the secondary treatment plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.

5 D E F 6 * I 4 B M A 7 $ J # H L O @ P T U 2 R Q Four of the following five are alike in a certain way on the basis of their positions in the above arrangement and so from a group. Which is the one that does not belong to the group?

Arrange the following statements in the correct order in which they occur during the formation and removal of urine in human beings. (a) Ureters carry urine to the urinary bladder (b) Wastes dissolved in water is filtered out as urine in the kidneys. (c ) Urine stored in urinary bladder is passed out through the urinary opening at the end of the urethra (d) Blood containing useful and harmful substances reaches the kidneys for filtration (e ) Blood containing useful and harmful substances reaches the kidneys for filtration.

Give the names and formula of the compounds indicated in the following statements. (a). A compounds of Ca used in setting fractured bones. (b). A compounds of calcium and hydrogen which is used as a prtable source of hydrogen for filling balloons. (c ). A compounds of Ca,O,Cl and H used as germicide. (d). A compound of Mg,O,Cl and H used as a cement for joining cracked teeth. (e). A compound of Mg, Cl and O used as a drying agent. ltbRgt (f). A compound of Ca and O which when heated in oxycoal gas flame gives limelight. (g). A compound of Ca, C and N used as a fertiliser. (h). A triatomic compound of Ca which gives H_(2) on treatments with water.

B 5 R 1 @ E K 4 F 7 c L A M 2 P 3 % 9 H I W 8 * 6 U J $ V Q # Three of the following four are alike in a certain way based on their position in the above arrangement and so form a group. Which is the one that does not belong to that group? (a) R1E (b) F7L (c) M23 (d) UJ6