Some Basic Concepts of Chemistry PYQs Set 7 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Some Basic Concepts of Chemistry · Set 7 (Q181-210)
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181. $The sum of three values 12.0, 19.034 and 2.0143 is equal to X . The number of significant figures in X is$ (1) $2$ (2) $5$ (3) $4$ (4) $3$ 182. $Given the numbers: 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers is$ (1) $3, 3 and 4 respectively$ (2) $3, 4 and 4 respectively$ (3) $3, 4 and 5 respectively$ (4) $3, 3 and 3 respectively.$ 183. $How much mass of sodium acetate is required to make 250 mL of 0.575 molar aqueous solution?$ (1) $11.79 g$ (2) $15.38 g$ (3) $10.81 g$ (4) $25.35 g$ 184. $Observe the following reaction I_{2} + 10 HNO_{3} \to 2 HIO_{3} + 10 NO_{2} + 4 H_{2} O The equivalent wt. of HNO_{3} is (molar mass of HNO_{3} = M)$ (1) $M$ (2) $\frac{M}{4}$ (3) $\frac{M}{2}$ (4) $\frac{M}{5}$ 185. $The dimensions of pressure are the same as that of$ (1) $force per unit volume$ (2) $energy per unit volume$ (3) $force$ (4) $energy.$ 186. $The volume of 0.1 M oxalic acid that can be completely oxidized by 20 mL of 0.025 M KMnO_{4} solution is$ (1) $125 mL$ (2) $25 mL$ (3) $12.5 mL$ (4) $37.5 mL$ 187. $Which of the following reactions is an example of a redox reaction?$ (1) $XeF2 + PF5 \to [XeF]+ P F_{6}^{-}$ (2) $XeF6 + H2O \to XeOF4 + 2HF$ (3) $XeF6 + 2H2O \to XeO2F2 + 4HF$ (4) $XeF4 + O2F2 \to XeF6 + O2$ 188. $In Haber's process, 50.0 g of N_{2} (g) and 10.0 g of H_{2} (g) are mixed to produce NH_{3} (g) . What is the number of moles of NH_{3} (g) formed?$ (1) $3.33$ (2) $2.36$ (3) $2.01$ (4) $5.36$ 189. $What is the mass of the precipitate formed when 50 m L of 16.9% solution of A g N O_{3} is mixed with 50 m L of 5.8% N a C 1 solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)$ (1) $3.5 g$ (2) $7 g$ (3) $14 g$ (4) $28 g$ 190. $6 g of urea (molar mass = 60 g mol^{- 1}) and 9 g of glucose (molar mass = 180 g mol^{- 1}) were dissolved in 35 g of water. The mass percent of urea and glucose is respectively$ (1) $18,12$ (2) $6,9$ (3) $12,18$ (4) $9,6$ 191. $How many gram of sodium (atomic mass 23 u) is required to prepare one mole of ethane from methyl chloride by Wurtz reaction?$ (1) $2$ (2) $23$ (3) $11.5$ (4) $46$ 192. $Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is:$ (1) $1.78 M$ (2) $2.00 M$ (3) $2.05 M$ (4) $2.22 M$ 193. $In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is (Given: Aqueous tension at 300 K = 15 mmHg)$ (1) $15.71 %$ (2) $17.46 %$ (3) $7.85 %$ (4) $20.95 %$ 194. $Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given: Molar mass of Mg is 24 g mol^{- 1}$ (1) $0.24 mg$ (2) $235.7 g$ (3) $2.444 g$ (4) $236 mg$ 195. $The emperical formula of a compound is C_{2} H_{5} O and its vapour density is 45 . What is the molecular formula of the compound?$ (1) $C_{2} H_{5} O$ (2) $C_{6} H_{13} O_{3}$ (3) $C_{4} H_{10} O_{2}$ (4) $C_{6} H_{15} O_{3}$ 196. $Which of the following chemical reactions depicts the oxidizing behaviour of H_{2} S O_{4} ?$ (1) $2HI + H2SO4 \to I2 + SO2 + 2H2O$ (2) $Ca(OH)2 + H2SO4 \to CaSO4 + 2H2O$ (3) $NaCl + H2SO4 \to NaHSO4 + HCl$ (4) $2PCl5 + H2SO4 \to 2POCl3 + 2HCl + SO2Cl2$ 197. $The molecular formula of a commercial resin used for exchanging ions in water softening is C_{8} H_{7} S O_{3} Na (Mol. wt. 206). What would be the maximum uptake of C a^{2 +} ions by the resin when expressed in mole per gram resin?$ (1) $\frac{1}{103}$ (2) $\frac{1}{206}$ (3) $\frac{2}{309}$ (4) $\frac{1}{412}$ 198. $The average molecular weight of the air which has 21 % of O_{2} and 79 % of N_{2}, is$ (1) $44.8 0$ (2) $100$ (3) $14.4$ (4) $28.8$ 199. $Molality (m) of 3 M aqueous solution of NaCl is : (Given : Density of solution = 1.25 g mL^{- 1}, Molar mass in gmol^{- 1} : Na - 23, Cl - 35.5)$ (1) $1.9 m$ (2) $3.85 m$ (3) $2.79 m$ (4) $2.90 m$ 200. $500 mL of a glucose solution contains 6.02 \times 1 0^{22} molecules. The concentration of the solution is$ (1) $0.1 M$ (2) $1.0 M$ (3) $0.2 M$ (4) $2.0 M$ 201. $Specific volume of cylindrical virus particle is 6.02 \times 1 0^{- 2} cc / g whose radius and length are 7 Å and 10 Å respectively if N_{A} = 6.02 \times 1 0^{23}, find molecular weight of virus.$ (1) $15.4 kg/mol$ (2) $1.54 \times 1 0^{4} k g / m o l$ (3) $3.08 \times 1 0^{4} kg/mol$ (4) $3.08 \times 1 0^{3} kg/mol$ 202. $100 mL of 0.2 M acetic acid is completely neutralised using a standard solution of NaOH . The volume of ethane obtained at STP after complete electrolysis of the resulting solution is$ (1) $11.2 L$ (2) $2.24 L$ (3) $0.224 L$ (4) $22.4 L$ 203. $For the reaction, Fe_{2} O_{3} + 3 CO \to 2 Fe + 3 CO_{2}, the volume of carbon monoxide required to reduce one mole of ferric oxide is$ (1) $67.2 dm^{3}$ (2) $11.2 dm^{3}$ (3) $22.4 dm^{3}$ (4) $44.8 dm^{3}$ 204. $Find the formula weight of reactants if the formula weight of product is 54 u and the percent atom economy is 75 .$ (1) $24 u$ (2) $30 u$ (3) $72 u$ (4) $80 u$ 205. $When KMnO_{4} acts as an oxidising agent and ultimately forms MnO_{4}^{2-}, MnO_{2}, Mn_{2} O_{3} and Mn^{2 +}, then the number of electrons transferred per molecule of KMnO_{4} in each case respectively, is:$ (1) $4, 3, 1, 5$ (2) $1, 5, 3, 7$ (3) $1, 3, 4, 5$ (4) $3, 5, 7, 1$ 206. $One mole of oxygen gas at STP is equal to$ (1) $6.022 \times 10^{23} molecules of oxygen$ (2) $6.022 \times 10^{23} atoms of oxygen$ (3) $32 g of oxygen$ (4) $both a and c$ 207. $Suppose the elements X and Y combine to form two compounds X Y_{2} and X_{3} Y_{2} . When 0.1 mole of X Y_{2} weighs 10 g and 0.05 mole of X_{3} Y_{2} weighs 9 g, the atomic weights o f X and Y are$ (1) $40, 30$ (2) $60, 40$ (3) $20, 30$ (4) $30, 20$ 208. $Two oxides of a X contain 50 % and 40 % of non-metal respectively. If the formula of the first oxide is XO_{2} . Then the formula of second oxide is$ (1) $X_{2} O_{3}$ (2) $X_{2} O_{5}$ (3) $XO_{3}$ (4) $X_{2} O$ 209. $An alloy of metals X and Y weighs 12 g and contains atoms X and Y in the ratio of 2 : 5 . The percentage of metal X in the alloy is 20 by mass. If the atomic mass of X is 40 amu what is the atomic mass of metal Y ?$ (1) $64 amu$ (2) $32 amu$ (3) $60 amu$ (4) $50 amu$ 210. $The molecular weight of O_{2} and S O_{2} are 32 and 64 respectively. At 15 C and 150 mmHg pressure, one litre of O_{2} contains N ’ molecules. The number of molecules in two litres of S O_{2} under the same conditions of temperature and pressure will be$ (1) $N l 2$ (2) $N$ (3) $2 N$ (4) $4 N$