Some Basic Concepts of Chemistry PYQs Set 11 (PDF)

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Some Basic Concepts of Chemistry · Set 11 (Q301-330)
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301. $For the following reaction, the mass of water produced from 445 g of C_{57} H_{110} O_{6} is: 2 C_{57} H_{110} O_{6} (s) + 163 O_{2} (g) \to 114 C O_{2} (g) + 110 H_{2} O(l)$ (1) $490 g$ (2) $445 g$ (3) $495 g$ (4) $890 g$ 302. $The number of atoms in 0.1 mol of a triatomic gas is (N_{A} = 6.02 \times 1 0^{23} mol^{- 1})$ (1) $6.026 \times 1 0^{22}$ (2) $1.806 \times 1 0^{23}$ (3) $3.600 \times 1 0^{23}$ (4) $1.800 \times 1 0^{22}$ 303. $N_{2 (g)} + 3 H_{2 (g)} \to 2 N H_{3 (g)} 20g 5g Consider the above reaction, the limiting reagent of the reaction and number of moles of N H_{3} formed respectively are:$ (1) $H_{2}, 1.42 moles$ (2) $H_{2}, 0.71 moles$ (3) $N_{2}, 1.42 moles$ (4) $N_{2}, 0.71 moles$ 304. $A sample of CaCO_{3} and MgCO_{3} weighed 2.21 g is ignited to constant weight of 1.152 g . The composition of mixture is : (Given molar mass in gmol^{- 1} CaCO_{3} : 100, MgCO_{3} : 84)$ (1) $1.187 gCaCO_{3} + 1.023 gMgCO_{3}$ (2) $1.023 gCaCO_{3} + 1.023 gMgCO_{3}$ (3) $1.187 gCaCO_{3} + 1.187 gMgCO_{3}$ (4) $1.023 gCaCO_{3} + 1.187 gMgCO_{3}$ 305. $Consider the following reaction: xMnO_{4}^{-} + yC_{2} O_{4}^{2-} + zH^{+} \to xMn^{2 +} + 2 y C O_{2} + \frac{z}{2} H2O The values of x, y and z in the reaction are, respectively:$ (1) $5, 2 and 16$ (2) $2, 5 and 8$ (3) $2, 5 and 16$ (4) $5, 2 and 8$ 306. $How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of P b O and 3.2 g H C l ?$ (1) $0.011$ (2) $0.029$ (3) $0.044$ (4) $0.333$ 307. $A mixture of gases contains H_{2} and O_{2} gases in the ratio of 1: 4 (w / w) . What is the molar ratio of the two gases in the mixture?$ (1) $16:1$ (2) $2:1$ (3) $1:4$ (4) $4 : 1$ 308. $How many grams of Mg is required to completely reduce 100 m l, 0.1 M N O_{3}^{-} solution using the following reaction N O_{3}^{-} + M g ⟶ M g^{2 +} + N H_{3}$ (1) $0.96$ (2) $0.62$ (3) $0.24$ (4) $0.75$ 309. $What volume of oxygen gas (O) measured at 0^{o} C and 1 a t m, is needed to burn completely 1 L of propane gas (^{C H}) measured under the same conditions?$ (1) $5 L$ (2) $10 L$ (3) $7 L$ (4) $6 L$ 310. $What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen.$ (1) $44.8 lit.$ (2) $22.4 lit.$ (3) $89.6 lit.$ (4) $67.2 lit.$ 311. $In a reaction container, 100 g of hydrogen and 100 g of C l_{2} are mixed for the formation of HCl gas. What is the limiting reagent and how much HCl is formed in the reaction?$ (1) $H_{2} is limiting reagent and 36.5 g of HCl are formed.$ (2) $C l_{2} is limiting reagent and 102.8 g of HCl are formed.$ (3) $H_{2} is limiting reagent and 142 g of HCl are formed.$ (4) $C l_{2} is limiting reagent and 73 g of HCl are formed.$ 312. $25.3 g of sodium carbonate, N a_{2} C O_{3} is dissolved in enough water to make 250 m L of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, N a^{+} and carbonate ions, C O_{3}^{2 -} are respectively (Molar mass of N a_{2} C O_{3} = 106 g m o l^{- 1})$ (1) $0.955 M and 1.910 M$ (2) $1.910 M and 0.955 M$ (3) $1.90 M and 1.910 M$ (4) $0.477 M and 0.477 M$ 313. $1.0 g of magnesium is burnt with 0.56 g O_{2} in a closed vessel. Which reactant is left in excess and how much? (A t . w t . M g = 24, O = 16)$ (1) $Mg, 0.16 g$ (2) $O_{2}, 0.16 g$ (3) $Mg, 0.44 g$ (4) $O_{2}, 0.28 g$ 314. $1 gram of a carbonate (M_{2} C O_{3}) on treatment with excess HCl produces 0.01186 mole of C O_{2} . The molar mass of M_{2} C O_{3} in g m o l^{-1} is:$ (1) $84.3$ (2) $118.6$ (3) $11.86$ (4) $1186$ 315. $When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of A ?$ (1) $C_{9} H_{8}$ (2) $C_{11} H_{4}$ (3) $C_{5} H_{8}$ (4) $C_{11} H_{8}$ 316. $At 300 K and 1 atm, 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20% O_{2} by volume for complete combustion. After combustion the gases occupy 330 mL. Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure, the formula of the hydrocarbon is:$ (1) $C_{3} H_{8}$ (2) $C_{4} H_{8}$ (3) $C_{4} H_{10}$ (4) $None$ 317. $Oxidation numbers of A, B, C are + 2, + 5 and - 2 respectively Possible formula of compound is$ (1) $A_{2} (B C_{2})_{2}$ (2) $A_{3} (B C_{4})_{2}$ (3) $A_{2} (B C_{3})_{2}$ (4) $A_{3} (B_{2} C)_{2}$ 318. $C(s) + O_{2} (g) \to C O_{2} (g) + 400 kJ C(s) + \frac{1}{2} O_{2} (g) \to CO(g) + 100 kJ When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into 'CO' and the remaining is converted into ‘ C O_{2} ’ The heat generated when 0.6 kg of coal is burnt is$ (1) $1600kJ$ (2) $3200kJ$ (3) $4400 kJ$ (4) $6600 kJ$ 319. $A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H_{2} S O_{4} . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be$ (1) $1.4$ (2) $3.0$ (3) $2.8$ (4) $4.4$ 320. $A mixture of CaCl_{2} and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca^{2 +} ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO . The percentage of NaCl in the mixture (atomic mass of Ca = 40) is$ (1) $75$ (2) $30.6$ (3) $25$ (4) $69.4$ 321. $Among the following which one is not paramagnetic? [Atomic numbers; Be = 4, Ne = 10, As = 33, Cl = 17]$ (1) $N e^{2 +}$ (2) $B e^{+}$ (3) $C l^{-}$ (4) $A s^{+}$ 322. $When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is x \times 1 0^{- 2} M. (Nearest Integer) (Molar mass of nitric acid is 63 g m o l^{- 1})$ 323. $The moles of methane required to produce 81 g of water after complete combustion is______x 1 0^{- 2} mol. [nearest integer]$ 324. $Consider the above reaction. The percentage yield of amide product is____ (Round off to the Nearest Integer). (Given: Atomic mass: C : 12.0 u, H : 1.0 u N : 14.0 u, O : 16.0 u, Cl : 35.5 u)$ 325. $Xg of benzoic acid on reaction with aq NaHCO_{3} released CO_{2} that occupied 11.2 L volume at STP. X is g.$ 326. $9.3 g of pure aniline is treated with bromine water at room temperature to give a white precipitate of the product ' P'. The mass of product ' P' obtaind is 26.4 g . The percentage yield is____________% .$ 327. $In the above reaction, 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield ofnitrobenzene in the above reaction is____% . (Round off to the Nearest Integer)Given atomic mass : C : 12.0 u, H : 1.0 uO : 16.0 u, N : 14.0 u$ 328. $Xg of nitrobenzene on nitration gave 4.2 g of m-dinitrobenzene. X = g. (nearest integer) [Given: molar mass (in (gmol^{- 1}) C : 12, H : 1, O : 16, N : 14]$ 329. $Assume carbon burns according to following equation : 2 C_{(s)} + O_{2 (g)} \to 2 CO (g) When 12 g carbon is burnt in 48 g of oxygen, the volume of carbon monoxide produced is ______x l 0^{- 1} L at STP [nearest integer] [Given : Assume CO as ideal gas, Mass of C is 12 g m o l^{- 1}, Mass of O is 16 g m o l^{- 1} and molar volume of an ideal gas at STP is 22.7 L m o l^{- 1}]$ 330. $100g of propane is completely reacted with 1000g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x × . The value of is ____. (Nearest integer) [Atomic weight: H = 1.008;C = 12.00;O = 16.00]$