Unit15 p-block elements qns

Unit15 p-block elements qns - 1 UNIT 15 P block elements...

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1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 15 P – block elements Sub groups 13, 14, 15, 16, 17 1. The electronic configuration of thallium is (a) (Ar) 3d 10 4s 2 4p 1 (b) (Kr) 4d 10 5s 2 5p 1 (c) (Xe) 5d 10 6s 2 6p 1 (d) none of these 2. Gillium and Indium follow (a) 1st transition series (b) 2nd transition series (c) 1st and 2nd transition series (d) 3rd transition series 3. Thallium show variable valency or different oxidation states because (a) it is a d-block elements (b) it is a f-block elements (c) of its amphoteric nature (d) of inert pair effect 4. Which of the following oxides is more stable than the other ? (a) Tl 2 O 3 (b) Tl 2 O (c) Ga 2 O (d) In 2 O 5. Gallium and Indium are used to dope germanium to produce (a) intrinsic semiconductors (b) p-type semiconductors (c) n-type semiconductors (d) non-conducting Ge 6. A silvery white metal is solid in cold days but liquefies on hot day, and reacts with dilute Hcl to give H 2. It can be (a) Sn (b) Sb (c) Bi (d) Ga 7. Borax has the formula (a) Na 2 B 4 O 7 .10H 2 O (b) H 3 BO 3 (c) NaBO 2 (d) Na 3 BO 3 8. When borax is heated with Cobalt nitrate, a blue bead is formed. The bead consists of (a) Cobalt meta-borate (b) Sodium meta-borate +Cobalt oxide (c) CoO + B 2 O 3 (d) CoO + Na 2 B 4 O 7 9. Which metal is usually obtained from its ore by electrolytic reduction? (a) Fe (b) Pb (c) Su (d) Al 10. Al. is a self - protecting metal because (a) it never tarnishes (b) it develops a carbonate Coating (c) it develops an oxide coating (d) it is inert 11. The reducing agent used in thermite process is (a) Fe 2 O 3 (b) Fe (c) Al 2 O 3 (d) Al 12. The basis for Al as a reducing agent in thermite process is (a) high exothermic Δ H hydration of Al 3+ (b) high Eox. Pot. of Al (c) high exothermic enthalpy of formation of Al 2 O 3 (d) high I.E. of Al 13. Which of the following will not rapidly
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This note was uploaded on 10/05/2011 for the course CHEM 1201 taught by Professor Darcy during the Spring '11 term at St. Mary NE.

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Unit15 p-block elements qns - 1 UNIT 15 P block elements...

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