ChemGGuru. JEE Main Online Exam 2019 [Memory Based Paper] Questions & Answer. Morning 9 th January 2019 CHEMISTRY

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1 CAREER PINT ChemGGuru JEE Main nline Exam 019 [Memory Based Paper] Questions & Answer Morning 9 th January 019 CHEMISTRY Q.1 What is the correct order of acidic-strength? N CH CH ( I) NC CH( CH II) F CH C H (III) C CH ( C H IV) I > II > III > IV () I > III > II > IV II > IV > III > I (4) I > III > IV > II Q. EtH Major product will be - () Et Et Et (4) Et Ans. [3] Q.3 H C H H (A) AgCN (B). (A) and (B) respectively are - Benzyl chloride & Benzyl cyanide () Benzyl chloride & Benzyl isocyanide Benzyl alcohol & Benzyl isocyanide (4) Benzyl alcohol & Benzyl cyanide Ans. [] Q.4 (i) Aq kh (ii) Cr 3 /H (iii) H S 4 / Ans. [3] () H (4) H 1

2 Q.5 Most Acidic compound is - CHI 3 () CH 3 CH 3 (4) CH(CN) 3 Q.6 Basic Strength order in N (I) Ans. [] N H (II) N H (III) I > II > III () III > I > II III > II > I (4) I > III > II Q.7 R C N Al(i But) H product. Product is - H R C H () R C H R C NH (4) R CH NH Ans. [] Q.8 + NH NH (i) Et 3 N (ii) Free radical polymerization (P) P is - (CH C) C (CH C) n () (CH C) n NH CH C NH C NH (4) (CH C) n C NH C NH C NH Q.9 Arrange correct basic strength order in amino acids is - Arg > Lys > Gly > Asp () Lys > Gly > Arg > Asp Asp > Arg > Gly > Lys (4) Asp > Gly > Lys > Arg

3 Q.10 A Phenol P NaHC 3 Test B Navthinth drone Q Carbylamine Test C Sulphamine R Fe 3 Test D Pencinilene S KMn 4 Test A R, B S, C Q, & D P () A P, B Q, C R, & D S A S, B P, C Q, & D R (4) A Q, B S, C R, & D P Q.11 Which of the following ore contain iron and copper Copper Pyrites () Malachite Dolomite (4) Cuprite Q.1 Aluminium shows +3 oxidation state but thallium shows +1 and +3 both why I.E. () Electron affinity Lattice structure (4) Inert pair effect Q.13 Going down the group which properties decrease and increase respectively Electro negativity, and Atomic Radius () Atomic Radius and Electro negativity Electro negativity and electron gain enthalpy (4) Electro gain enthalpy and electro negativity Q.14 Which of the following is highest value of spin only magnetic moment in transition metal complex may be - Ans. [] 6.9 () (4) 8.9 Q.15 Which is correct for Li or Li Both are stable () Li is more stable than Li Ans. [] Li is more stable than Li (4) Both do not exist Q.16 In which of the following no water of crystallization is present Mg(N 3 ) () Ca(N 3 ) Sr(N 3 ) (4) Ba(N 3 ) 3

4 Q.17 Which properties are shown by silicon (a) water repellant (b) non toxic (c) high dielectric strength and resistant to oxidation (d) used in grease. a, b, c only () a, b only b, c only (4) a, b, c, d Q.18 Which is not prescribed concentration of some metal in drinking water. Ans. [] Zn 0.05 PPM () Mn 0.5 PPM Fe 0. PPM (4) Cu.0 PPM Q.19 Which of the following is isotope of Hydrogen Deuterium, Tritium () Protium, Deuterium Protium, Tritium (4) Protium, Deuterium, Tritium Q.0 [Cr(H ) 6 ] 3 [Cr(NH 3 ) 6 ] 3 Yellow Violet Which of the following is incorrect Paramagnetic and 3 unpaired electron () Absorb complementery colours. [Cr(H ) 6 ] 3 has less 0 (splitting energy) than [Cr(NH 3 ) 6 ] 3 (4) It will absorb energy from violet & yellow light The crystal field splitting parameter can be measured by wavelength of yellow & violet colours for A and B respectively. Q.1 When e excited from n i = 8 to n f = n the graph between (wave number) and Ans. [] 1 is... n Straight line with ve slope ( R H ) () Straight line with +ve slope (+R H ) non linear with ve slope ( R H ) (4) None Q. 0 ml, 0.1 MH S 4 and 30 ml, 0. M NH 4 H are mixed, find, out ph of resulting solution, if pk b = 4.7 Ans. [3] 5.3 () (4) 9.4 4

5 Q.3 For a particular chemical reaction concentration of reactants and rate of reaction is given as - [A]M [B],M rate of reaction ms Determine half life period for the chemical reaction - 10 () (4) None Q.4 Which of the following Henry s Law statement is not correct - If Henry s constant increases solubility of gas increases. () The partial pressure of a gas is directly proportional to mole fraction of the gas in the liquid. For same value of pressure different gases have different value of k H (4) As temperature increases value of k H increases. Q F charge is passed from PbS 4 (aq) solution. Calculate wt. of Pb deposited. [Pb S 4 = 303] 5 g () 303 g 15 g (4) g Q.6 Calculate molality of Na +, if 9 gm Na + is dissolved in 1 kg of H. 4 m () m 5 m (4) 3 m Q.7 The adsorption isotherm is given as below : log m x 4 log P Ans. [] Then m x is proportional to - P () P 1/ P 1/3 (4) P Q.8 There are mixture of two gases A and B are taken in a container having volume equal to 10 dm 3 and temperature equals to 1000 K and pressure 00 Pa. If moles of A given are 0.5. Find out moles of gas B 4 R R () 4 R R R R (4) R 5

6 Q.9 Reversible isothermal expansion of gas for two temperature & T (T > ). Graph of Vs nv will be - T T () nv nv T T (4) nv nv Q.30 Which of the following is piezoelectric material - Ans. [] Silica () Quartz Mica (4) Beryl 6

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