Some Basic Concepts of Chemistry PYQs Set 13 (PDF)

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Some Basic Concepts of Chemistry · Set 13 (Q361-390)
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361. $81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is$ (1) $81.398 g$ (2) $71.40 g$ (3) $91.4 g$ (4) $81 g$ 362. $Which of the following is a homogeneous mixture?$ (1) $Milk$ (2) $A mixture of two minerals such as galena (black) and quartz (white)$ (3) $Blue copper (II) sulphate solution$ (4) $Foggy air$ 363. $The number of significant figures in 38.57 mL is$ (1) $Two$ (2) $Four$ (3) $Infinite$ (4) $Three$ 364. $The amount of sugar (C_{12} H_{22} O_{11}) required to prepare 2 L of its 0.1 M aqueous solutions is:$ (1) $68.4 g$ (2) $34.2 g$ (3) $17.1 g$ (4) $136.8 g$ 365. $How many significant figures are present in 0.010100 \times 1 0^{3} ?$ (1) $7$ (2) $5$ (3) $3$ (4) $10$ 366. $The number of significant figures in value 5.041 is$ (1) $5$ (2) $2$ (3) $3$ (4) $4$ 367. $Excess of NaOH (aq) was added to 100 mL of F e C l_{3} (aq) resulting into 2.14 g of Fe (O H)_{3} . The molarity of F e C l_{3} (aq) is: (Given molar mass of Fe = 56 g m o l^{-1} and molar mass of Cl = 35.5 g m o l^{-1})$ (1) $1.8 M$ (2) $0.2 M$ (3) $0.6 M$ (4) $0.3 M$ 368. $When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?$ (1) $C_{8} H_{6}$ (2) $C_{9} H_{9}$ (3) $C_{6} H_{6}$ (4) $C_{9} H_{6}$ 369. $One litre hard water contains 12.00 mg M g^{2 +} Milli‐equivalents of washing soda required to remove its hardness is$ (1) $1$ (2) $12.16$ (3) $1 \times 1 0^{- 3}$ (4) $12.16 \times 1 0^{- 3}$ 370. $Which of the following consists of two or more than two different types of atoms?$ (1) $Silica$ (2) $Graphite$ (3) $Diamond$ (4) $Ozone$ 371. $The compound which is added to table salt for maintaining proper health is$ (1) $KCl$ (2) $K B r$ (3) $N a I$ (4) $M g B r_{2}$ 372. $From the following masses, the one which is expressed nearest to the milligram is$ (1) $16 g$ (2) $16.4 g$ (3) $16.428 g$ (4) $16.4284 g$ 373. $What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?$ (1) $2.8 kg$ (2) $6.4 kg$ (3) $9.6 kg$ (4) $96 kg$ 374. $The number of significant figures in 6.02 \times 1 0^{23} is$ (1) $23$ (2) $3$ (3) $4$ (4) $26$ 375. $Which of the following halogen can be purified by sublimation$ (1) $F_{2}$ (2) $C l_{2}$ (3) $B r_{2}$ (4) $I_{2}$ 376. $A mixture of Z n C l_{2} and P b C l_{2} can be separated by$ (1) $Distillation$ (2) $Crystallization$ (3) $Sublimation$ (4) $Adding aceitic acid$ 377. $Which of the following elements of matter would best convey that there is life on earth$ (1) $Oxygen$ (2) $Hydrogen$ (3) $Carbon$ (4) $Iron$ 378. $Which symbol replaces the unit of atomic mass, amu?$ (1) $u$ (2) $A$ (3) $M$ (4) $n$ 379. $A mixture of methyl alcohol and acetone can be separated by$ (1) $Distillation$ (2) $Fractional distillation$ (3) $Steam distillation$ (4) $Distillation under reduced pressure$ 380. $1.78 g of an optically active L -amino acid (A) is treated with NaNO_{2} / HCl at 0^{\circ} C . 448 cm^{3} of nitrogen was at STP is evolved. A sample of protein has 0.25 % of this amino acid by mass. The molar mass of the protein is$ (1) $36, 500 g mol^{- 1}$ (2) $34, 500 g mol^{- 1}$ (3) $35, 400 g mol^{- 1}$ (4) $35, 600 g mol^{- 1}$ 381. $Which of the following sets of components form homogeneous mixture?$ (1) $Phenol + Water$ (2) $Sugar + Benzene$ (3) $Silver chloride + Water$ (4) $Ethyl alcohol + Water$ 382. $Which of the following contains only one element$ (1) $Marble$ (2) $Diamond$ (3) $Glass$ (4) $Sand$ 383. $10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be$ (1) $3 mol$ (2) $4 mol$ (3) $1 mol$ (4) $2 mol$ 384. $Which one of the following is not an element$ (1) $Diamond$ (2) $Graphite$ (3) $Silica$ (4) $Ozone$ 385. $In known elements, the maximum number is of$ (1) $Metals$ (2) $Non-metals$ (3) $Metalloids$ (4) $None of these$ 386. $Suppose the mass of an object has been determined to be 14.5678 g . If the accuracy of the analytical balance used is 0.0001 g, this means that the actual mass of the object is$ (1) $14.5678 g$ (2) $14.5677 g$ (3) $14.5679 g$ (4) $between 14.5677 g and 14.5679 g$ 387. $The number of moles of methane required to produce 11 gCO_{2} (g) after complete combustion is : (Given molar mass of methane in gmol^{- 1} : 16)$ (1) $0.35$ (2) $0.5$ (3) $0.75$ (4) $0.25$ 388. $One atmosphere is equal to$ (1) $101.325 K pa$ (2) $1013.25 K pa$ (3) $1 0^{5} Nm$ (4) $None of these$ 389. $When F e_{0.93} O is heated in presence of oxygen, it converts to F e_{2} O_{3} . The number of correct statement/s from the following is_______. A. The equivalent weight of F e_{0.93} O is \frac{M o l ec u l a r w e i g h t}{0.79} B. The number of moles of F e^{2 +} and F e^{3 +} in 1 mole of F e_{0.93} O is 0.79 and 0.14 respectively. C. F e_{0.93} O is metal deficient with lattice comprising of cubic closed packed arrangement of O^{2 -} ions. D. The % composition of F e^{2 +} and F e^{3 +} in F e_{0.93} O is 85% and 15% respectively.$ 390. $A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is________ x 1 0^{3} g m o l^{- 1} [nearest integer]$