7/25/2019 Chem Class 12 Sample Paper 3

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CHEMISTRY

Time allowed: 3hours maximum marks: 70

General instructions:

1. All questions are compulsory.

2. Question o. 1!" are #ery short answer questions and carry 1 mark each.3. Question o. $!1" are short answer questions and carry 2 marks each.

%. Question o. 1$!27 are also short answer questions and carry 3 marks each.

&. Question o. 2"!30 are lon' answer questions and carry & marks each.

(. Question o. 2"!30 are lon' answer questions and carry & marks each.

Q. 1 Name the non-stoichiometric point defect responsible for colour in alkali metal halides. 1Q. 2. Write the IUPAC name of coordination isomer of the compound C!"N#$%&' Cr"CN%&' 1Q $. Write IUPAC name of the follo(in) compoundQ *. Chloroacetic acid has lo(er p+a ,alue than acetic acid. 1Q . Write the structural formula of N N/dimeth0lethanamine. 1Q &. What happens (hen -)lucose is treated (ith the bromine (ater 1

Q 3. #o( does ,ulcanisation chan)e the character of natural rubber 1Q 4. ifferentiate bet(een anta)onists and a)onists. 1Q 5. 67plain the follo(in) terms (ith suitable e7amples 8/ "i% Non-ionic deter)ents "ii% 9ran:uili;ers 2Q 1i,e suitable reasons for the follo(in) 8 "i% Alk0l halides )i,e c0anides (ith +CN but isoc0anide (ith A)CN. "ii% 9he dipole moment of chloroben;ene is lo(er than that of c0clohe70l chloride. 2

Q 1$. Compare the follo(in) comple7es (ith respect to shape and ma)netic beha,iour "i% Ni"CN%*'2/ "ii% NiCl*'2/ 2Q 1*. Compare the chemistr0 of actinoids (ith that of lanthanoids (ith special reference to "a% o7idation state "b% chemical reacti,it0 21. 67plain the follo(in) terms (ith a suitable e7ample in each case "a% =hape selecti,e catal0sts 2 "b% electroosmosis !rQ 1. Write the difference bet(een "a% Ph0sisorption and Chemisorption "b% Catal0st and en;0me 2

Q 1&. What t0pe of cell is the lead stora)e batter0 Write the anode and the cathode reactions and the o,erallreaction occurrin) in a lead stora)e batter0 (hile operatin) or in use. 2Q 13. Account for the follo(in) / 2 "a% 9he ,apour pressure of a solution of )lucose in (ater is lo(er than that of pure (ater. "b% ?i7ture of phenol and aniline sho(s "/%,e de,iation from @aoults la(.Q 14. Write chemical e:uations for the preparation of sols 8 "a% >old sol b0 reduction "b% h0drated ferric o7ide sol b0 h0drol0sis 2Q 15. An element has a bcc structure (ith a cell ed)e of 244 pm. 9he densit0 of the metal is 3.2 ) cm/$. #o(man0 atoms and unit cells are there in 2

7/25/2019 Chem Class 12 Sample Paper 3

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Q 2

7/25/2019 Chem Class 12 Sample Paper 3

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Q 25. "a% Complete the follo(in) chemical e:uations

"i% P*"s% Na!# "a:% #2! "l%

"ii% I/ "a:% #2!"l% !$ ")%

"b% Assi)n a reason for each of follo(in) 8 "i% i"E% is a stron)er o7idisin) a)ent than =b"E%. "ii% Gluorine does not e7hibit an0 positi,e o7idation state. "iii% In solution of #2=!* in (ater the second dissociation constant +a2 is less than the first dissociationconstant +a1.Q $i,e chemical tests to distin)uish bet(een 8 "i% Phenol and ben;oic acid "ii% Acetophenone and ben;ophenone "c% Arran)e the follo(in) in increasin) order of acid stren)ths 8 "C#$%2C#C!!# C#2C#2C#"r% C!!# C#$C#"r%C#2C!!# !rQ $