SECTION I (Multiple Choice Questions)

Transcription

1 ANDHERI / BORIVALI / DADAR / CHEMBUR / THANE / MULUND/ NERUL / POWAI IIT JEE - 09 CRASH COURSE (MAIN) MARKS:90 TIME: 5 MIN. TOPIC: CHEMICAL & IONIC EQUILIBRIUM DATE:9//8 SECTION I (Multiple Chice Questins) This sectin cntains 0 multiple chice questins. Each questin has chices (), (), () and () fr its anser, ut hich ONLY ONE is crrect. (+, -). The equilibrium cnstants fr the reactins:- SO O SO g g g; K SO O SO ;K g g g The relatinship beteen K & K is:- () K K () K K () K K () K K. The equilibrium cnstant fr the synthesis f HI at 90 C is 50. The value f K fr dissciatin f HI ill be:- () 0.0 () 50 () 0.50 () 0.0. Fr the reactin AB A g g B g, AB is % dissciated at a ttal pressure f P; Therefre P is related t KP by hich f the flling ptin: () P KP () P K P () P KP () P 8KP.. mle f FeCl &.mle f NHSCN are added t L f ater. At equilibrium, mle f FeSCN are frmed K fr the given reactin ill be Fe SCN FeSCN C () () 0.0 ().0 () In hich f the flling, the reactin almst prceeds tards cmpletin? () K () K 0 () K 0 () K 0 6. Fr the flling reactin at temperature ill be:- PCl Cl PCl 5 g g g 50 C, the value f KC is 6, then the value f () 0.57 () 0.6 () 0.8 () In hich f the flling KP is less than () NO g NO g () HIg H g Ig S0 O S0 () PCl5 PCl g g Clg () g g g K C KP at the same CENTERS: MUMBAI / DELHI / AKOLA / KOLKATA / LUCKNOW / NASHIK / GOA / PUNE #

2 8. Le chatelier s principle is applicable t:- () Only hmgeneus chemical reversible reactins. () Only hetergeneus chemical reversible reactins. () Only physical equilibria. () All systems, chemical r physical in equilibrium. 9. In the melting f ice at 0 C, hich are favrable cnditins? () High T & High P () L T & L P () L T & High P () High T & L P 0. The yield f the prduct in the reactin, A B g g Cg Heat, uld be higher at:- () L T, High P () High T, High P () L T, L P () High T, L P. The reactin:- C H H C H ; H.7Kcal. g g 6g is carried ut in a vessel. The equilibrium cncentratin f CH can be increased by:- () Increasing the temperature () Decreasing the pressure () Remving sme hydrgen () All f these. Fr the reactin CaCO s CaO s CO g 8500 lg KP 7.8 T temperature in Celsius required ill be:- () 67 C () 89 C () KP is expressed as:-. Fr cmplete decmpsitin f CaCO 8500 C () s at atm external pressure the 850 C. Which f the flling ill be favred at l pressure? N g I g HI g N g H g NH g () () () PCl PCl 5 g g Clg () N O g g NOg. Densities f Diamnd & graphite are.5 &. gm/ml respectively. Increase in pressure n the equilibrium C C diamnd graphite () Favrs backard reactin () favrs frard reactin () has n effect () Increases the reactin rate. 5. Equilibrium cnstants fr different reactins are given as:- 6 K 0,K 0, K 0, K hich reactin ill take place t a negligible extent? () K () K () K () K 6. A certain eak acid has a dissciatin cnstant f ith strng base is: () 0 () 0 0 () 0. The equilibrium cnstant fr its reactin 0 0 () 7. What ill be the slubility f AgCl in a 0.M NaClslutin? 0 ( K AgCl.0 0 ) sp 0 () 0.M (). 0 9 M (). 0 0 M (). 0 M CENTERS: MUMBAI / DELHI / AKOLA / KOLKATA / LUCKNOW / NASHIK / GOA / PUNE #

3 8. Buffering actin f a mixture f CHCOOH & CHCOONa is maximum hen the rati f salt t acid is equal t:- ().0 () 00.0 () 0.0 () Why is pure NaClprecipitated hen HCl gas is passed in saturated slutin f NaCl? () Impurities disslve in HCl. () The prduct f Na & Cl prducts becmes smaller than Ksp f NaCl. () The prduct f Na & Cl prducts becmes higher than Ksp f NaCl. () HCl disslves in ater. 0. The crrect increasing rder f strengths f flling acids is:- () HSO,CHCOOH,H CO () CHCOOH,H SO, HCO () HCO,CHCOOH, HSO () CHCOOH,HCO, HSO 8. ph f 0 mlar slutin f HCl in ater is () 8 () 6 () beteen 7 t 8 () beteen 6 and 7. The aqueus slutin f AlCl is acidic due t:- () Catin hydrlysis () Anin hydrlysis () Hydrlysis f bth ins () Dissciatin.. The buffer capacity f buffer cntaining acid ith pka is highest hen its ph is equal t:- () 6 () 5 () (). Which f the flling statements is crrect () pk increases ith increase in temperature. () pk decreases ith increase in temperature. () pk = at all temperature. () pk = ph at all temperature A eak acid f dissciatin cnstant 0 is being titrated ith aq. NaOH slutin. The ph at the pint f ne third neutralizatin f the acid ill be:- () 5. ().7 () 5.8 ().5 6. The dissciatin cnstants f t acids HA & HA are 0 &.80 5 respectively. The relative strengths f acids ill be apprximately:- () : () : () : 6 () 6 : 7. Which f the flling slutins ill has ph clse t unity? () 00 m,m /0HC 00m,M /0 NaOH () 55m,M /0HCl 5m,M /0 NaOH () 0m,M /0 HCl 90m,M /0 NaOH () 75m,M / 5HC 5m,M / 5 NaOH 8. An acidic buffer slutin can be prepared by mixing the slutins f:- () Sdium acetate and acetic acid () Ammnium chlride & Ammnium hydrxide. () Sulphuric acid and sdium hydrxide. () Sdium chlride & sdium hydrxide. CENTERS: MUMBAI / DELHI / AKOLA / KOLKATA / LUCKNOW / NASHIK / GOA / PUNE #

4 9. Phenlphthalein gives a pink clur in alkaline medium due t the fact that:- () It is a clured cmpund () It inizes t give clured ins. () It frms cmplex ith alkali () Nne f these 0. In the reactin:- I I I the leis base is () I () I () I () Nne CENTERS: MUMBAI / DELHI / AKOLA / KOLKATA / LUCKNOW / NASHIK / GOA / PUNE #

5 ANDHERI / BORIVALI / DADAR / CHEMBUR / THANE / MULUND/ NERUL / POWAI IIT JEE - 09 CRASH COURSE (MAIN) MARKS:90 TIME: 5 MIN. TOPIC: CHEMICAL & IONIC EQUILIBRIUM DATE:9//8 ANSWER KEY. (). (). (). () Fe SCN FeSCN KC () 6. () 7. () 8. () 9. () 0. (). (). () K P T T 67K 89 C. (). () 5. () 6. () 7. () 8. () 9. () 0. (). (). (). (). () 5. () 6. () 7. () 8. () 9. () 0. () CENTERS: MUMBAI / DELHI / AKOLA / KOLKATA / LUCKNOW / NASHIK / GOA / PUNE # 5