Some Basic Concepts of Chemistry PYQs Set 9 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Some Basic Concepts of Chemistry · Set 9 (Q241-270)
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241. $How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of P b O and 3.2 g H C l ?$ (1) $0.011$ (2) $0.029$ (3) $0.044$ (4) $0.333$ 242. $A mixture of gases contains H_{2} and O_{2} gases in the ratio of 1: 4 (w / w) . What is the molar ratio of the two gases in the mixture?$ (1) $16:1$ (2) $2:1$ (3) $1:4$ (4) $4 : 1$ 243. $How many grams of Mg is required to completely reduce 100 m l, 0.1 M N O_{3}^{-} solution using the following reaction N O_{3}^{-} + M g ⟶ M g^{2 +} + N H_{3}$ (1) $0.96$ (2) $0.62$ (3) $0.24$ (4) $0.75$ 244. $What volume of oxygen gas (O) measured at 0^{o} C and 1 a t m, is needed to burn completely 1 L of propane gas (^{C H}) measured under the same conditions?$ (1) $5 L$ (2) $10 L$ (3) $7 L$ (4) $6 L$ 245. $What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen.$ (1) $44.8 lit.$ (2) $22.4 lit.$ (3) $89.6 lit.$ (4) $67.2 lit.$ 246. $In a reaction container, 100 g of hydrogen and 100 g of C l_{2} are mixed for the formation of HCl gas. What is the limiting reagent and how much HCl is formed in the reaction?$ (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) $C l_{2} is limiting reagent and 73 g of HCl are formed.$ 247. $25.3 g of sodium carbonate, N a_{2} C O_{3} is dissolved in enough water to make 250 m L of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, N a^{+} and carbonate ions, C O_{3}^{2 -} are respectively (Molar mass of N a_{2} C O_{3} = 106 g m o l^{- 1})$ (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) $0.477 M and 0.477 M$ 248. $1.0 g of magnesium is burnt with 0.56 g O_{2} in a closed vessel. Which reactant is left in excess and how much? (A t . w t . M g = 24, O = 16)$ (1) $Mg, 0.16 g$ (2) $O_{2}, 0.16 g$ (3) $Mg, 0.44 g$ (4) $O_{2}, 0.28 g$ 249. $1 gram of a carbonate (M_{2} C O_{3}) on treatment with excess HCl produces 0.01186 mole of C O_{2} . The molar mass of M_{2} C O_{3} in g m o l^{-1} is:$ (1) $84.3$ (2) $118.6$ (3) $11.86$ (4) $1186$ 250. $When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of A ?$ (1) $C_{9} H_{8}$ (2) $C_{11} H_{4}$ (3) $C_{5} H_{8}$ (4) $C_{11} H_{8}$ 251. $At 300 K and 1 atm, 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20% O_{2} by volume for complete combustion. After combustion the gases occupy 330 mL. Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure, the formula of the hydrocarbon is:$ (1) $C_{3} H_{8}$ (2) $C_{4} H_{8}$ (3) $C_{4} H_{10}$ (4) $None$ 252. $Oxidation numbers of A, B, C are + 2, + 5 and - 2 respectively Possible formula of compound is$ (1) $A_{2} (B C_{2})_{2}$ (2) $A_{3} (B C_{4})_{2}$ (3) $A_{2} (B C_{3})_{2}$ (4) $A_{3} (B_{2} C)_{2}$ 253. $C(s) + O_{2} (g) \to C O_{2} (g) + 400 kJ C(s) + \frac{1}{2} O_{2} (g) \to CO(g) + 100 kJ When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into 'CO' and the remaining is converted into ‘ C O_{2} ’ The heat generated when 0.6 kg of coal is burnt is$ (1) $1600kJ$ (2) $3200kJ$ (3) $4400 kJ$ (4) $6600 kJ$ 254. $A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H_{2} S O_{4} . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be$ (1) $1.4$ (2) $3.0$ (3) $2.8$ (4) $4.4$ 255. $A mixture of CaCl_{2} and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca^{2 +} ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO . The percentage of NaCl in the mixture (atomic mass of Ca = 40) is$ (1) $75$ (2) $30.6$ (3) $25$ (4) $69.4$ 256. $Among the following which one is not paramagnetic? [Atomic numbers; Be = 4, Ne = 10, As = 33, Cl = 17]$ (1) $N e^{2 +}$ (2) $B e^{+}$ (3) $C l^{-}$ (4) $A s^{+}$ 257. $Calculate the amount of C O_{2} gas produced, when 32 g of C H_{4} is burned with sufficient amount of oxygen. (Given, atomic weights of C = 12, O = 16, H = 1)$ (1) $132 g$ (2) $44 g$ (3) $88 g$ (4) $176 g$ 258. $If Avogadro number N_{A}, is changed from 6.022 \times 1 0^{23} m o l^{- 1} to 6.022 \times 1 0^{20} m o l^{- 1} this would change$ (1) $the definition of mass in units of grams$ (2) $the mass of one mole of carbon$ (3) $the ratio of chemical species to each-other in a balanced equation$ (4) $the ratio of elements to each-other in a compound$ 259. $A mixture of 100 m mol of Ca (OH)_{2} and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH^{-} in resulting the solution, respectively, are: (Molar mass of Ca (OH)_{2}, Na_{2} SO_{4} and CaSO_{4} are 74, 143 and 136 g mol^{- 1}, respectively; K_{sp} of Ca (OH)_{2} is 5.5 \times 10^{- 6})$ (1) $1.9 g, 0.28 mol L^{- 1}$ (2) $13.6 g, 0.28 mol L^{- 1}$ (3) $1.9 g, 0.14 mol L^{- 1}$ (4) $13.6 g, 0.14 mol L^{- 1}$ 260. $For the given reaction: CaCO_{3} + 2 HCl ⟶ CaCl_{2} + H_{2} O + CO_{2} If 90 g CaCO_{3} is added to 300 mL of HCl which contains 38.55 % HCl by mass and has density 1.13 g mL^{- 1}, then which of the following option is correct? Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol^{- 1} respectively.$ (1) $64.97 g of HCl remains unreacted$ (2) $60.32 g of HCl remains unreacted$ (3) $97.30 g of HCl reacted$ (4) $32.85 g of CaCO_{3} remains unreacted$ 261. $The unit J P a^{- 1} is equivalent to$ (1) $m^{3}$ (2) $c m^{3}$ (3) $d m^{3}$ (4) $None of these$ 262. $Candela is the SI unit of$ (1) $Luminous intensity$ (2) $Luminous flux$ (3) $Luminosity$ (4) $Luminescence$ 263. $A solution of two components containing moles of the component and , moles of the component is prepared and are the molecular weights of component and respectively. If is the density of the solution in is the molarity and is the mole fraction of the component, then can be expressed as$ (1) $C_{2} = \frac{1000 x _{2}}{M _{1} + x _{2} ( M _{2} - M _{1} )}$ (2) $C_{2} = \frac{1000 dx _{2}}{M _{1} + x _{2} ( M _{2} - M _{1} )}$ (3) $C_{2} = \frac{d x _{2}}{M _{2} + x _{2} ( M _{2} - M _{1} )}$ (4) $C_{2} = \frac{d x _{1}}{M _{2} + x _{2} ( M _{2} - M _{1} )}$ 264. $The significant figures in 3400 are$ (1) $2$ (2) $5$ (3) $6$ (4) $4$ 265. $A + 2 B ⟶ AB_{2} 36.0 g of 'A' (Molar mass: 60 g mol^{- 1}) and 56.0 g of ' B^{’} (Molar mass: 80 g mol^{- 1}) are allowed to react. Which of the following statements are correct ?(A) ' A ' is the limiting reagent.(B) 77.0 g of AB2 is formed.(C) Molar mass of AB2 is 140 g mol^{- 1} .(D) 15.0 g of A is left unreacted after the completion of reaction. Choose the correct answer from the options given below:$ (1) $(C) and (D) Only$ (2) $(A) and (B) Only$ (3) $(A) and (C) Only$ (4) $(B) and (D) Only$ 266. $Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of space occupied by a substance. (D)Temperatures below 0^{\circ} C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible. (E) Precision refers to the closeness of various measurements for the same quantity. Choose the correct answer from the options given below :$ (1) $(A), (D) and (E) Only$ (2) $(C), (D) and (E) Only$ (3) $(A), (B) and (C) Only$ (4) $(B), (C) and (D) Only$ 267. $1 cc N_{2} O at NTP contains$ (1) $\frac{1.8}{224} \times 1 0^{22} atoms$ (2) $\frac{6.02}{22400} \times 1 0^{23} molecules$ (3) $\frac{1.32}{224} \times 1 0^{23} electrons$ (4) $All the above.$ 268. $Which has maximum molecules?$ (1) $7 g N_{2}$ (2) $2 g H_{2}$ (3) $16 g N O_{2}$ (4) $16 g O_{2}$ 269. $How many seconds are there in 3 days?$ (1) $259200 s$ (2) $172800 s$ (3) $24800 s$ (4) $72000 s$ 270. $Mass of 0.1 mole of methane is$ (1) $1.6 g$ (2) $0.1 g$ (3) $1 g$ (4) $16 g$