Some Basic Concepts of Chemistry PYQs Set 10 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Some Basic Concepts of Chemistry · Set 10 (Q271-300)
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271. $Correct order of prefixes is$ (1) $pico < nano < micro < milli$ (2) $nano < pico < micro < milli$ (3) $micro < pico < milli < nano$ (4) $milli < micro < pico < nano$ 272. $Which has the maximum number of molecules among the following?$ (1) $44 g C O_{2}$ (2) $48 g O_{3}$ (3) $8 g H_{2}$ (4) $64 g S O_{2}$ 273. $If an object has a mass of 0.2876 g , then find the mass of nine such objects:$ (1) $2.5884 g$ (2) $2.5886 g$ (3) $2.588 g$ (4) $2.5 g$ 274. $Which of the following concentration factor is affected by change in temperature?$ (1) $Molarity$ (2) $Molality$ (3) $Mole fraction$ (4) $Weight fraction$ 275. $A sample was weighted using two different balances. The result’s were (i) 3.929 g (ii) 4.0 g. How would the weight of the sample be reported$ (1) $3.929 g$ (2) $3 g$ (3) $3.9 g$ (4) $3.93 g$ 276. $The volume of 10 N and 4 NHCl required to make 1 litre of 7 NHCl are$ (1) $0.50 litre of 10 NHCl and 0.50 litre of 4 N HCl$ (2) $0.60 litre of 10 NHCl and 0.40 litre of 4 N HCl$ (3) $0.80 litre of 10 NHCl and 0.20 litre of 4 N HCl$ (4) $0.75 litre of 10 NHCl and 0.25 litre of 4 N HCl .$ 277. $In the addition of 89.332 and 1.1, the correct number of significant figures in the reported answer will be$ (1) $two$ (2) $five$ (3) $four$ (4) $three$ 278. $Which of the following is a homogeneous mixture?$ (1) $Smoke$ (2) $Milk$ (3) $Iodized table salt$ (4) $Gasoline$ 279. $The member of significant figures in 2.0400 is$ (1) $3$ (2) $2$ (3) $4$ (4) $5$ 280. $Mark the rule which is not correctly stated about the determination of significant figures.$ (1) $Zeros preceding to first non-zero digit are not significant.$ (2) $Zeros between two non-zero digit are not significant.$ (3) $Zeros at the end or right of the number are significant if they are on the right side of decimal point.$ (4) $All non-zero digits are significant.$ 281. $Dalton's law of partial pressures is applicable to which one of the following systems?$ (1) $NH_{3}, HCl$ (2) $NO, O_{2}$ (3) $H_{2}, Cl_{2}$ (4) $CO, H_{2}$ 282. $81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is$ (1) $81.398 g$ (2) $71.40 g$ (3) $91.4 g$ (4) $81 g$ 283. $Which of the following is a homogeneous mixture?$ (1) $Milk$ (2) $A mixture of two minerals such as galena (black) and quartz (white)$ (3) $Blue copper (II) sulphate solution$ (4) $Foggy air$ 284. $The number of significant figures in 38.57 mL is$ (1) $Two$ (2) $Four$ (3) $Infinite$ (4) $Three$ 285. $The amount of sugar (C_{12} H_{22} O_{11}) required to prepare 2 L of its 0.1 M aqueous solutions is:$ (1) $68.4 g$ (2) $34.2 g$ (3) $17.1 g$ (4) $136.8 g$ 286. $How many significant figures are present in 0.010100 \times 1 0^{3} ?$ (1) $7$ (2) $5$ (3) $3$ (4) $10$ 287. $The number of significant figures in value 5.041 is$ (1) $5$ (2) $2$ (3) $3$ (4) $4$ 288. $Excess of NaOH (aq) was added to 100 mL of F e C l_{3} (aq) resulting into 2.14 g of Fe (O H)_{3} . The molarity of F e C l_{3} (aq) is: (Given molar mass of Fe = 56 g m o l^{-1} and molar mass of Cl = 35.5 g m o l^{-1})$ (1) $1.8 M$ (2) $0.2 M$ (3) $0.6 M$ (4) $0.3 M$ 289. $When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?$ (1) $C_{8} H_{6}$ (2) $C_{9} H_{9}$ (3) $C_{6} H_{6}$ (4) $C_{9} H_{6}$ 290. $One litre hard water contains 12.00 mg M g^{2 +} Milli‐equivalents of washing soda required to remove its hardness is$ (1) $1$ (2) $12.16$ (3) $1 \times 1 0^{- 3}$ (4) $12.16 \times 1 0^{- 3}$ 291. $Which of the following consists of two or more than two different types of atoms?$ (1) $Silica$ (2) $Graphite$ (3) $Diamond$ (4) $Ozone$ 292. $The compound which is added to table salt for maintaining proper health is$ (1) $KCl$ (2) $K B r$ (3) $N a I$ (4) $M g B r_{2}$ 293. $From the following masses, the one which is expressed nearest to the milligram is$ (1) $16 g$ (2) $16.4 g$ (3) $16.428 g$ (4) $16.4284 g$ 294. $What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?$ (1) $2.8 kg$ (2) $6.4 kg$ (3) $9.6 kg$ (4) $96 kg$ 295. $The number of significant figures in 6.02 \times 1 0^{23} is$ (1) $23$ (2) $3$ (3) $4$ (4) $26$ 296. $Which of the following halogen can be purified by sublimation$ (1) $F_{2}$ (2) $C l_{2}$ (3) $B r_{2}$ (4) $I_{2}$ 297. $A mixture of Z n C l_{2} and P b C l_{2} can be separated by$ (1) $Distillation$ (2) $Crystallization$ (3) $Sublimation$ (4) $Adding aceitic acid$ 298. $Which of the following elements of matter would best convey that there is life on earth$ (1) $Oxygen$ (2) $Hydrogen$ (3) $Carbon$ (4) $Iron$ 299. $Which symbol replaces the unit of atomic mass, amu?$ (1) $u$ (2) $A$ (3) $M$ (4) $n$ 300. $A mixture of methyl alcohol and acetone can be separated by$ (1) $Distillation$ (2) $Fractional distillation$ (3) $Steam distillation$ (4) $Distillation under reduced pressure$