Some Basic Concepts of Chemistry PYQs Set 4 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Some Basic Concepts of Chemistry · Set 4 (Q91-120)
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91. $The mass of a metal, with equivalent mass 31.75 which would combine with 8 g of oxygen is$ (1) $1$ (2) $8$ (3) $3.175$ (4) $31.75$ 92. $In an experiment it showed that 10 m L of 0.05 M solution of chloride required 10 m L of 0.1 M solution of A g N O_{3}, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine)$ (1) $X_{2} C l_{2}$ (2) $X C l_{2}$ (3) $X C l_{4}$ (4) $X C l$ 93. $For formation of 3.40 g of ammonia gas, what volumes of hydrogen gas and nitrogen gas, respectively are required at NTP conditions?$ (1) $2.24 L and 2.24 L$ (2) $2.24 L and 1.24 L$ (3) $6.72 L and 2.24 L$ (4) $6.72 L and 1.12 L$ 94. $56 g of CaO has been mixed with 63 g of HNO_{3}, the amount of Ca (NO_{3})_{2} formed is$ (1) $4 g$ (2) $8.28 g$ (3) $164 g$ (4) $82 g$ 95. $Molarity of liquid H C 1, if density of solution is 1.17 g / cc is$ (1) $36.5$ (2) $18.25$ (3) $32.05$ (4) $42.10$ 96. $An organic compound contains 78 % (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [At. wt. of C is 12, H is 1]$ (1) $CH$ (2) $CH_{2}$ (3) $CH_{3}$ (4) $CH_{4}$ 97. $A gas mixture contains 25 % He and 75 % CH_{4} by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately$ (1) $25 %$ (2) $92 %$ (3) $8 %$ (4) $75 %$ 98. $If 500 ml of 1 M solution of glucose is mixed with 500 ml of 1 M solution of glucose final molarity of solution will be:$ (1) $1 M$ (2) $0.5 M$ (3) $2 M$ (4) $1.5 M$ 99. $The number of oxygen atoms in 4.4 g of C O_{2} is$ (1) $1.2 \times 1 0^{23}$ (2) $6 \times 1 0^{22}$ (3) $6 \times 1 0^{23}$ (4) $12 \times 1 0^{23}$ 100. $Which of the following rules regarding the significant figures and calculations involving them is not correct?$ (1) $The result of an addition or subtraction is reported to the same number of decimal places as present in number with least decimal places.$ (2) $Result of multiplication or division should have same number of significant figures as present in most precise figure.$ (3) $The result of multiplication or division should be rounded off to same number of significant figure as present in least precise figure.$ (4) $The non-significant figures in the measurements are rounded off.$ 101. $2M of 100 ml N a_{2} S O_{4} is mixed with 3M of 100 ml NaCl solution and 1M of 200 ml C a C l_{2} solution. Then the ratio of the concentration of cation and anion.$ (1) $1/2$ (2) $2$ (3) $1.5$ (4) $1$ 102. $25 cm^{3} of oxalic acid completely neutralised 0.064 g of sodium hydroxide. Molarity of the oxalic acid solution is$ (1) $0.064$ (2) $0.045$ (3) $0.015$ (4) $0.032$ 103. $For the following reaction the mass of water produced from 445 g of C_{57} H_{110} O_{6} is : 2 C_{57} H_{110} O_{6} (s) + 163 O_{2} (g) \to 114 C O_{2} (g) + 110 H_{2} O (1)$ (1) $490 g$ (2) $445 g$ (3) $495 g$ (4) $890 g$ 104. $Equal masses of H_{2}, O_{2} and methane have been taken in a container of volume V at temperature 27^{\circ} C in identical conditions. The ratio of the volumes of gases H_{2} : O_{2} : methane would be$ (1) $8 : 16 : 1$ (2) $16 : 8 : 1$ (3) $16 : 1 : 2$ (4) $8 : 1 : 2$ 105. $C_{2} H_{4} can react with H_{2} in presence of a catalyst to form C_{2} H_{6} as per the following reaction, C_{2} H_{4} (g) + H_{2} (g) \to catalyst C_{2} H_{6} (g) . The amount of C_{2} H_{4} in grams required to produce 50 grams of C_{2} H_{6} is$ (1) $36.44 g$ (2) $22.18 g$ (3) $46.67 g$ (4) $57.11 g$ 106. $Volume of C O_{2} obtained by the complete decomposition of 9.85 g of B a C O_{3} is$ (1) $2.24 L$ (2) $1.12 L$ (3) $0.84 L$ (4) $0.56 L$ 107. $Among 10^{- 9} g (each) of the following elements, which one will have the highest number of atoms? Element: Pb, Po, Pr and Pt$ (1) $Pr$ (2) $Pt$ (3) $Po$ (4) $Pb$ 108. $50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. The amount of NaOH in 50 mL of the given sodium hydroxide solution is:$ (1) $10 g$ (2) $40 g$ (3) $80 g$ (4) $none$ 109. $What is number of atoms present in 2.24 dm^{3} NH_{3 (g)} at STP?$ (1) $6.022 \times 10^{22}$ (2) $1.8066 \times 10^{22}$ (3) $2.4088 \times 10^{23}$ (4) $6.022 \times 10^{23}$ 110. $Ratio of C_{p} and C_{v} of a gas ‘X’ is 1.4. The number of atoms of the gas ‘X’ present in 11.2litres of it at NTP will be$ (1) $6.02 \times 1 0^{23}$ (2) $1.2 \times 1 0^{23}$ (3) $3. 01 \times 1 0^{23}$ (4) $2. 01 \times 1 0^{23}$ 111. $How many moles of ammonia are produced by 5 moles of hydrogen?$ (1) $2.3$ (2) $8.3$ (3) $10.3$ (4) $3.3$ 112. $50 cm^{3} of 0.04 M K_{2} Cr_{2} O_{7} in acidic medium oxidizes a sample of H_{2} S gas to sulphur. Volume of 0.03 M KMnO_{4} required to oxidize the same amount of H_{2} S gas to sulphur, in acidic medium is$ (1) $60 cm^{3}$ (2) $80 cm^{3}$ (3) $90 cm^{3}$ (4) $120 cm^{3}$ 113. $Density of a 2.05M solution of acetic acid in water is 1.02 g/ml. The molality of the solution is:$ (1) $1.14 mol k g^{-1}$ (2) $3.28 mol k g^{-1}$ (3) $2.28 mol k g^{-1}$ (4) $0.44 mol k g^{-1}$ 114. $Concentrated nitric acid is labelled as 75 % by mass. The volume in mL of the solution which contains 30 g of nitric acid is . Given: Density of nitric acid solution is 1.25 g / mL .$ (1) $40$ (2) $32$ (3) $45$ (4) $55$ 115. $The amount of 50 % (w / w) solution of hydrochloric acid required to react with 200 g of CaCO_{3} would be$ (1) $73 g$ (2) $292 g$ (3) $146 g$ (4) $100 g$ 116. $What volume (in ml) of 0.2 M H_{2} S O_{4} solution should be mixed with the 40 ml of 0.1 M NaOH solution such that the resulting solution has the concentration of H_{2} S O_{4} as \frac{6}{55} M.$ (1) $70$ (2) $45$ (3) $30$ (4) $58$ 117. $A solution of sodium sulfate contains 92 g of Na^{+} ions per kilogram of water. The molality of Na^{+} ions in that solution in molk g^{- 1} is:$ (1) $12$ (2) $4$ (3) $8$ (4) $16$ 118. $The right option for the mass of CO_{2} produced by heating 20 g of 20 % pure limestone is (Atomic mass of Ca = 40) (CaCO_{3} \to 1200 K CaO + CO_{2})$ (1) $1.32 g$ (2) $1.12 g$ (3) $1.76 g$ (4) $2.64 g$ 119. $Complete combustion of 1.80 g of an oxygen containing compound (C_{x} H_{y} O_{z}) gave 2.64 g of CO_{2} and1.08 g of H_{2} O . The percentage of oxygen in the organic compound is:$ (1) $63.53$ (2) $53.33$ (3) $51.63$ (4) $50.33$ 120. $The highest number of helium atoms is in$ (1) $4 mol of helium$ (2) $4 u of helium$ (3) $4 g of helium$ (4) $2.271098 L of helium at STP$