Tiêu đề Percentage Composition and Molecular Formula.pdf ✅

(1.) 120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO2 and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are (a.) 25 and 75 (b.) 40 and 60 (c.) 60 and 40 (d.) 75 and 25 JEE Main-24.06.2022, Shift-II (2.) The empirical formula of a non-electrolyte is CH O2 . A solution containing 6 g of the compound exerts the same osmotic pressure as that of 0.05M glucose solution at the same temperature. The molecular formula of the compound is (a.) C H O 2 4 2 (b.) C H O 3 6 3 (c.) C H O 5 10 5 (d.) C H O 4 8 4 BCECE-2014 Karnataka-CET, 2009 (3.) 1 g of silver gets distributed between 3 10 cm of molten zinc and 3 100 cm of molten lead at 800 C . The percentage of silver in the zinc layer is approximately (a.) 89 (b.) 91 (c.) 97 (d.) 94BCECE-2014, Karnataka-CET, 2010 (4.) In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL . of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (aqueous tension at 300 K 15 mm = ) (a.) 15.44 (b.) 16.45 (c.) 17.45 (d.) 14.45 JIPMER-2014 NEET-2011 (5.) 3.92 g of ferrous ammonium sulphate reacts completely with 4 N 50ml KMnO 10 solution. The percentage purity of the sample is (a.) 50 (b.) 78.4 (c.) 80 (d.) 39.2[BITSAT-2014, 2006] (6.) The molecular formulae for phosgene and tear gas are  . and  . respectively,
(a.) COCl2 and CCl NO 2 2 (b.) SOCl2 and CCl NO 2 2 (c.) COCl2 and CCl NO 3 2 (d.) SOCl2 and CCl NO 3 2 GUJCET-2015, 2016 (7.) A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to set 0.56 g of CaO . The percentage of NaCl in the mixture is (atomic mass of Ca 40 = ) (a.) 75 (b.) 31.5 (c.) 40.2 (d.) 25Karnataka-CET-2011, 2010 (8.) An organic compound contains 60%C;4.48% H and 35.5% O. Its empirical formula is (a.) C H O 9 8 4 (b.) C H O 5 4 2 (c.) C H O 5 4 4 (d.) C H O 9 7 6 TS-EAMCET (Engg.), 05.08.2021 Shift-II (9.) If 0.765 g of an acid gives 0.535 g of CO2 and 0.138 g of H O2 then ratio percentage of C and H is (a.) 19 : 2 (b.) 18 :12 (c.) 20 :17 (d.) 1: 7 AP EAPCET 25.08.2021, Shift-II (10.) Using Duma's method for estimating nitrogen. 1 g of an organic compound ' X ' gave 82ml of nitrogen, collected at 27 C and 750 mmHg pressure. If the aqueous tension at 27 C is 30 mmHg pressure, then the percentage of nitrogen in the given compound X is (a.) 22.09% (b.) 88.36% (c.) 44.18% (d.) 70.69% AP EAPCET 25.08.2021, Shift-II (11.) Using Kjeldahl's method over 1 g of a soil sample, the ammonia evolved could neutralize 25ml of 2 4 1MH SO . Then, the percentage of nitrogen present in the sample is - (a.) 100%
(b.) 60% (c.) 70% (d.) 25% AP EAPCET 20.08.2021 Shift-I (12.) In each molecule of carbon tetrachloride. the mass percent of carbon and chlorine respectively are and (a.) 76.86 & 23.14 (b.) 7.84 & 92.80 (c.) 23.14 & 76.86 (d.) 78.41&9.25 AP EAPCET 24.08.2021, Shift-I (13.) 7.8 of a compound having molecular formula C H6 6 , on reacting with CH COCl / /AlCl 3 3 gives 8.4 g of a product which has molecular formula C H O 8 8 . Calculate the percentage yield of the product C H O 8 8 . (Given atomic weights of H,C and O respectively are 1.12 and 16 ) (a.) 70% (b.) 60% (c.) 80% (d.) 75% AP EAPCET 20.08.2021 Shift-II (14.) Complete combustion of 1.80 g of an oxygen containing compound (C H O x y z ) gave 2.64 g of CO2 and 1.08 g of H O2 . The percentage of oxygen in the organic compound is: (a.) 63.53 (b.) 53.33 (c.) 51.63 (d.) 50.33JEE Main 25-02-2021, Shift-I (15.) When benzyl alcohol is reacted with concentrated HBr produces the product ' P '. The product ' P ' on reaction with KCN gives " Q ". The product " Q " on heating with HO3 + generates " R " The molecular formula of " R " is (a.) C H O 8 8 2 (b.) C H O 7 6 2 (c.) C H NO 8 9 2 (d.) C H N 8 7 TS-EAMCET 09.08.2021, Shift-I (16.) A pure compound contains 2.4 g of 23 C,1.2 10  atoms. Its empirical formula is (a.) C HO 2 (b.) C H O 2 2 2 (c.) CH O2
(d.) CHO Karnataka-CET-2021 (17.) An organic compound contains 78% (by wt) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is [Atomic wt. of C is 12, h is 1] (a.) CH4 (b.) CH (c.) CH2 (d.) CH3 NEET-2021 (18.) 0.12 g of an organic compound ' X ' containing phosphorus on reacting with magnesia mixture gave 0.22 g of magnesium pyrophosphate (Mg O 2 2 7 P ) . The percentage of phosphorus in the compound ' X ' is ........ (a.) 45.30% (b.) 28.70% (c.) 64.25% (d.) 51.20% AP EAMCET (Engg.) 18.09.2020, Shift-I (19.) In Kjeldahl's method, ammonia from 5 g of food neutralizes 3 30 cm of 0.1 N acid. The percentage of nitrogen in the food is (a.) 0.84 (b.) 8.4 (c.) 16.8 (d.) 1.68COMEDK-2020 (20.) If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance? (a.) 73.29 (b.) 78.45% (c.) 83.23% (d.) 89.50% [BITSAT-2020] (21.) On electrolysis of aqueous solution of a halide of a metal ' M ' by passing 1.5 ampere current for 10 minutes deposits 0.2938 g of metal. If the atomic mass of the metal is 63gm / mole , then what will be the formula of the metal halide? (a.) MCl2 (b.) MCl3 (c.) MCl (d.) MCl4 GUJCET-2020