Some Basic Concepts of Chemistry PYQs Set 8 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Some Basic Concepts of Chemistry · Set 8 (Q211-240)
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211. $20 mL of Fe^{2 +} solution of certain concentration has completely reacted with 20 mL of 0.01 M K_{2} Cr_{2} O_{7} in acidic medium. If 20 mL of same Fe^{2 +} solution has reacted completely with 20 mL of KMnO_{4} solution in acid medium, the molarity of KMnO_{4} solution is$ (1) $0.01 M$ (2) $0.12 M$ (3) $0.10 M$ (4) $0.012 M$ 212. $What is the amount of water formed by combustion of 1.6 g methane?$ (1) $3.2 g$ (2) $16 g$ (3) $6.2 g$ (4) $3.6 g$ 213. $The average molar mass of chlorine is 35.5 g mol^{- 1} . The ratio of^{35} Cl to^{37} Cl in naturally occurring chlorine is close to$ (1) $01 : 01$ (2) $02 : 01$ (3) $3 : 01$ (4) $04 : 01$ 214. $At 300 K and 1 atmospheric pressure, 10 mL of hydrocarbon required 55 mL of O_{2} for complete combustion and 40 mL of CO_{2} is formed. The formula of the hydrocarbon is :$ (1) $C_{4} H_{10}$ (2) $C_{4} H_{6}$ (3) $C_{4} H_{7} Cl$ (4) $C_{4} H_{8}$ 215. $An aqueous solution containing 6.5 g of NaCl of 90 % purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH . The volume of 1 M acetic acid required to neutralise NaOH obtained above is$ (1) $2000 cm^{3}$ (2) $100 cm^{3}$ (3) $200 cm^{3}$ (4) $1000 cm^{3}$ 216. $When 20 g of CaCO_{3} is treated with 20 g of HCl, the mass of CO_{2} formed would be$ (1) $10 g$ (2) $8.8 g$ (3) $22.2 g$ (4) $20 g$ 217. $An organic compound having C, H and O has 13.13 % H, 52.14 % C and 34.73 % O . Its molar mass is 46.068 g . What are its empirical and molecular formulae?$ (1) $C_{2} H_{6} O, C_{4} H_{12} O_{2}$ (2) $CH_{3} O, C_{2} H_{6} O_{2}$ (3) $C_{2} H_{6} O, C_{2} H_{6} O$ (4) $C_{2} H_{6} O_{2}, C_{3} H_{9} O_{4}$ 218. $What is the molarity of H_{2} S O_{4} solution that has a density of 1.84 g/cc and contains 98% by mass of H_{2} S O_{4} ? (Given atomic mass of S = 32)$ (1) $4.18 M$ (2) $8.14 M$ (3) $18.4 M$ (4) $18 M$ 219. $0.6 g of urea on strong heating with NaOH evolves N H_{3} . Liberated N H_{3} will combine completely with which of the following HCl solution?$ (1) $100 mL of 0.2 NHCl$ (2) $400 mL of 0.2NHCl$ (3) $100 mL of 0.1 NHCl$ (4) $200 mL of 0.2NHCl$ 220. $What will be the answer in appropriate significant figures as a result of addition of 3.0223 and 5.041?$ (1) $80.633$ (2) $8.0633$ (3) $8.063$ (4) $806.33$ 221. $Given P = 0.0030 m, Q = 2.40 m, R = 3000 m, Significant figures in P, Q and R are respectively$ (1) $2, 2, 1$ (2) $2, 3, 4$ (3) $4, 2, 1$ (4) $4, 2, 3$ 222. $According to significant figure convention, the result obtained by adding 12.11, 18.0 and 1.012 is$ (1) $31.12$ (2) $31.1$ (3) $31$ (4) $31.122$ 223. $A compound X contains 32 % of A, 20 % of B and remaining percentage of C . Then, the empirical formula of X is (Given atomic masses of A = 64; B = 40, C = 32)$ (1) $A_{2} B C_{2}$ (2) $A B C_{3}$ (3) $A B_{2} C_{2}$ (4) $AB C_{4}$ 224. $The dimension of energy per unit volume is the same as that of$ (1) $Force$ (2) $Pressure$ (3) $Power$ (4) $Density$ 225. $The number of significant figures in 60.0001 is$ (1) $5$ (2) $6$ (3) $3$ (4) $2$ 226. $Two solution of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5M first solution + 520 ml of 1.2M second solution. What is the molarity of the final mixture ?$ (1) $2.70M$ (2) $1.344M$ (3) $1.50M$ (4) $1.20M$ 227. $The correctly reported answer of the addition of 29.4406 , 3.2 and 2.25 will have significant figures:$ (1) $3$ (2) $4$ (3) $2$ (4) $5$ 228. $The number of moles of H_{2}, which is required to produce 10 moles of NH_{3} in the following reaction is a H_{2} (g) + b NO_{2} (g) ⟶ c NH_{3} (g) + d H_{2} O (g)$ (1) $10$ (2) $20$ (3) $35$ (4) $53$ 229. $The maximum number of molecules is present in$ (1) $15 L of H_{2} gas at STP$ (2) $5 L of N_{2} gas at STP$ (3) $0.5 g of H_{2} gas$ (4) $10 g of O_{2} gas$ 230. $The total number of electrons in 18 mL of water (density = 1 g mL^{- 1}) is$ (1) $6.02 \times 10^{23}$ (2) $6.02 \times 10^{25}$ (3) $6.02 \times 10^{24}$ (4) $6.02 \times 18 \times 10^{23}$ 231. $28 gKOH is required to completely neutralise CO_{2} produced on heating 60 g of impure CaCO_{3} . The percentage purity of CaCO_{3} is approximately (molar masses of KOH and CaCO_{3} are 56 and 100 g mol^{- 1}, respectively)$ (1) $41.6$ (2) $40$ (3) $20.8$ (4) $83.3$ 232. $Equal masses of H_{2}, O_{2} and methane have been taken in a container of volume V at temperature 2 7^{o} C in identical conditions. The ratio ofthe volumes ofgases H_{2} : O_{2} : methane would be$ (1) $8:16:1$ (2) $16:8:1$ (3) $16:1: 2$ (4) $8:1: 2$ 233. $The volume of water that must be added to a mixture of 250 ml of 0.6 M HCl and 750 ml of 0.2 M HCl to obtain 0.25 M solution of HCl is:$ (1) $750 ml$ (2) $100 ml$ (3) $200 ml$ (4) $300 ml$ 234. $What should be the volume of the milk (in m^{3}) which measures 5 L?$ (1) $5 \times 1 0^{- 3} m^{3}$ (2) $5 \times 1 0^{3} m^{3}$ (3) $5 \times 10000 m^{3}$ (4) $5 \times 1 0^{6} m^{3}$ 235. $A metal oxide has the formula Z_{2} O_{3} . It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is$ (1) $27.9$ (2) $159.6$ (3) $79.8$ (4) $55.8$ 236. $For the following reaction, the mass of water produced from 445 g of C_{57} H_{110} O_{6} is: 2 C_{57} H_{110} O_{6} (s) + 163 O_{2} (g) \to 114 C O_{2} (g) + 110 H_{2} O(l)$ (1) $490 g$ (2) $445 g$ (3) $495 g$ (4) $890 g$ 237. $The number of atoms in 0.1 mol of a triatomic gas is (N_{A} = 6.02 \times 1 0^{23} mol^{- 1})$ (1) $6.026 \times 1 0^{22}$ (2) $1.806 \times 1 0^{23}$ (3) $3.600 \times 1 0^{23}$ (4) $1.800 \times 1 0^{22}$ 238. $N_{2 (g)} + 3 H_{2 (g)} \to 2 N H_{3 (g)} 20g 5g Consider the above reaction, the limiting reagent of the reaction and number of moles of N H_{3} formed respectively are:$ (1) $H_{2}, 1.42 moles$ (2) $H_{2}, 0.71 moles$ (3) $N_{2}, 1.42 moles$ (4) $N_{2}, 0.71 moles$ 239. $A sample of CaCO_{3} and MgCO_{3} weighed 2.21 g is ignited to constant weight of 1.152 g . The composition of mixture is : (Given molar mass in gmol^{- 1} CaCO_{3} : 100, MgCO_{3} : 84)$ (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) $1.023 gCaCO_{3} + 1.187 gMgCO_{3}$ 240. $Consider the following reaction: xMnO_{4}^{-} + yC_{2} O_{4}^{2-} + zH^{+} \to xMn^{2 +} + 2 y C O_{2} + \frac{z}{2} H2O The values of x, y and z in the reaction are, respectively:$ (1) $5, 2 and 16$ (2) $2, 5 and 8$ (3) $2, 5 and 16$ (4) $5, 2 and 8$