Some Basic Concepts of Chemistry PYQs Set 12 (PDF)

Back to Some Basic Concepts of Chemistry

Set 12 of 14 · Questions 331-360 of 392

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions JEE Main Chemistry · Some Basic Concepts of Chemistry · Set 12 (Q331-360)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
331. $Calculate the amount of C O_{2} gas produced, when 32 g of C H_{4} is burned with sufficient amount of oxygen. (Given, atomic weights of C = 12, O = 16, H = 1)$ (1) $132 g$ (2) $44 g$ (3) $88 g$ (4) $176 g$ 332. $If Avogadro number N_{A}, is changed from 6.022 \times 1 0^{23} m o l^{- 1} to 6.022 \times 1 0^{20} m o l^{- 1} this would change$ (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) $the ratio of elements to each-other in a compound$ 333. $A mixture of 100 m mol of Ca (OH)_{2} and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH^{-} in resulting the solution, respectively, are: (Molar mass of Ca (OH)_{2}, Na_{2} SO_{4} and CaSO_{4} are 74, 143 and 136 g mol^{- 1}, respectively; K_{sp} of Ca (OH)_{2} is 5.5 \times 10^{- 6})$ (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) $13.6 g, 0.14 mol L^{- 1}$ 334. $For the given reaction: CaCO_{3} + 2 HCl ⟶ CaCl_{2} + H_{2} O + CO_{2} If 90 g CaCO_{3} is added to 300 mL of HCl which contains 38.55 % HCl by mass and has density 1.13 g mL^{- 1}, then which of the following option is correct? Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol^{- 1} respectively.$ (1) $64.97 g of HCl remains unreacted$ (2) $60.32 g of HCl remains unreacted$ (3) $97.30 g of HCl reacted$ (4) $32.85 g of CaCO_{3} remains unreacted$ 335. $The unit J P a^{- 1} is equivalent to$ (1) $m^{3}$ (2) $c m^{3}$ (3) $d m^{3}$ (4) $None of these$ 336. $Candela is the SI unit of$ (1) $Luminous intensity$ (2) $Luminous flux$ (3) $Luminosity$ (4) $Luminescence$ 337. $A solution of two components containing moles of the component and , moles of the component is prepared and are the molecular weights of component and respectively. If is the density of the solution in is the molarity and is the mole fraction of the component, then can be expressed as$ (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) $C_{2} = \frac{d x _{1}}{M _{2} + x _{2} ( M _{2} - M _{1} )}$ 338. $The significant figures in 3400 are$ (1) $2$ (2) $5$ (3) $6$ (4) $4$ 339. $A + 2 B ⟶ AB_{2} 36.0 g of 'A' (Molar mass: 60 g mol^{- 1}) and 56.0 g of ' B^{’} (Molar mass: 80 g mol^{- 1}) are allowed to react. Which of the following statements are correct ?(A) ' A ' is the limiting reagent.(B) 77.0 g of AB2 is formed.(C) Molar mass of AB2 is 140 g mol^{- 1} .(D) 15.0 g of A is left unreacted after the completion of reaction. Choose the correct answer from the options given below:$ (1) $(C) and (D) Only$ (2) $(A) and (B) Only$ (3) $(A) and (C) Only$ (4) $(B) and (D) Only$ 340. $Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of space occupied by a substance. (D)Temperatures below 0^{\circ} C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible. (E) Precision refers to the closeness of various measurements for the same quantity. Choose the correct answer from the options given below :$ (1) $(A), (D) and (E) Only$ (2) $(C), (D) and (E) Only$ (3) $(A), (B) and (C) Only$ (4) $(B), (C) and (D) Only$ 341. $1 cc N_{2} O at NTP contains$ (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) $All the above.$ 342. $Which has maximum molecules?$ (1) $7 g N_{2}$ (2) $2 g H_{2}$ (3) $16 g N O_{2}$ (4) $16 g O_{2}$ 343. $How many seconds are there in 3 days?$ (1) $259200 s$ (2) $172800 s$ (3) $24800 s$ (4) $72000 s$ 344. $Mass of 0.1 mole of methane is$ (1) $1.6 g$ (2) $0.1 g$ (3) $1 g$ (4) $16 g$ 345. $Correct order of prefixes is$ (1) $pico < nano < micro < milli$ (2) $nano < pico < micro < milli$ (3) $micro < pico < milli < nano$ (4) $milli < micro < pico < nano$ 346. $Which has the maximum number of molecules among the following?$ (1) $44 g C O_{2}$ (2) $48 g O_{3}$ (3) $8 g H_{2}$ (4) $64 g S O_{2}$ 347. $If an object has a mass of 0.2876 g , then find the mass of nine such objects:$ (1) $2.5884 g$ (2) $2.5886 g$ (3) $2.588 g$ (4) $2.5 g$ 348. $Which of the following concentration factor is affected by change in temperature?$ (1) $Molarity$ (2) $Molality$ (3) $Mole fraction$ (4) $Weight fraction$ 349. $A sample was weighted using two different balances. The result’s were (i) 3.929 g (ii) 4.0 g. How would the weight of the sample be reported$ (1) $3.929 g$ (2) $3 g$ (3) $3.9 g$ (4) $3.93 g$ 350. $The volume of 10 N and 4 NHCl required to make 1 litre of 7 NHCl are$ (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) $0.75 litre of 10 NHCl and 0.25 litre of 4 N HCl .$ 351. $In the addition of 89.332 and 1.1, the correct number of significant figures in the reported answer will be$ (1) $two$ (2) $five$ (3) $four$ (4) $three$ 352. $Which of the following is a homogeneous mixture?$ (1) $Smoke$ (2) $Milk$ (3) $Iodized table salt$ (4) $Gasoline$ 353. $The member of significant figures in 2.0400 is$ (1) $3$ (2) $2$ (3) $4$ (4) $5$ 354. $Mark the rule which is not correctly stated about the determination of significant figures.$ (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) $All non-zero digits are significant.$ 355. $Dalton's law of partial pressures is applicable to which one of the following systems?$ (1) $NH_{3}, HCl$ (2) $NO, O_{2}$ (3) $H_{2}, Cl_{2}$ (4) $CO, H_{2}$ 356. $The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the same as its molality. Density of this solution at 298 K is 2.0 g . The ratio of the molecular weights of the solute and solvent, , is$ 357. $During estimation of nitrogen by Dumas' method of compound X (0.42 g) mL of N_{2} gas will be liberated at STP. (nearest integer) (Given molar mass in g mol^{- 1} : C : 12, H : 1, N : 14)$ 358. $Consider the above reaction where 6.1 g of benzoic acid is used to get 7.8 g of m - bromo benzoic acid. The percentage yield of the product is____(Round off to the Nearest integer) [Given : Atomic masses : C = 12.0 u, H : 1.0 u, O : 16.0 u, Br = 80.0 u]$ 359. $Butane reacts with oxygen to produce carbon dioxide and water following the equation given below. C_{4} H_{10} (g) + \frac{13}{2} O_{2} (g) \to 4 CO_{2} (g) + 5 H_{2} O (1) If 174.0 kg of butane is mixed with 320.0 kg of O_{2}, the volume of water formed in liters is (Nearest integer). [Given : (a) Molar mass of C, H, O are 12, 1, 16 g mol^{- 1} respectively, (b) Density of water (= 1 g mL^{- 1})$ 360. $Consider the following reaction occurring in the blast furnace: Fe_{3} O_{4 (s)} + 4 CO_{(g)} 3 Fe_{(l)} + 4 CO_{2 (g)}^{’} x' kg of iron is produced when 2.32 \times 10^{3} kgFe_{3} O_{4} and 2.8 \times 10^{2} kgCO are brought together in the furnace. The value of ' x' is . (nearest integer) Given: molar mass of Fe_{3} O_{4} = 232 g mol^{- 1} molar mass of CO = 28 g mol^{- 1} molar mass of (Fe = 56 g mol^{- 1})$