Title Laws of Chemical Combinations.pdf ✅

(1.) Among the following pairs of compounds, the one that does not illustrate the law of multiple proportions, is (a.) NO and NO2 (b.) CuO and Cu O2 (c.) FeO and Fe O2 3 (d.) H O2 and H S 2 (e.) NO and N O2 Kerala CEE -03.07.2022 (2.) Calculate the amount of hydrogen gas required in order to produce 100 g of ammonia by the reaction of N g 2 ( ) and H g 2 ( ) gases. (a.) 35.29 g (b.) 17.65 g (c.) 28.11 g (d.) 34 g AP EAPCET 24.08.2021 Shift-II (3.) When 20 g of CaCO3 is treated with 20 g of HCl the mass of CO2 formed would be (a.) 10 g (b.) 8.8 g (c.) 22.2 g (d.) 20 g AP EAPCET 19-08-2021 Shift-I (4.) The complete combustion of one mole of benzene produces grams of carbon dioxide. (a.) 164 (b.) 220 (c.) 264 (d.) 308AP EAPCET 20.08.2021 Shift-II (5.) From the given reactions identify the disproportionation reaction (i) Cl g 2Kl aq 2KCl aq I 2 2 ( ) + ⎯⎯→ + ( ) ( ) (s) (ii) Cl g 2OH 2 ( ) − + (aq) ClO aq Cl ( ) ⎯⎯→ + − − (aq) +H O2 (l) (iii) Mg s 2HCl aq MgCl aq ( ) + ⎯⎯→ + ( ) 2 ( ) H g 2 ( ) (iv) 2 2 2H O (aq) ⎯⎯→ + 2H O O 2 2 (l) (a.) (i) and (iv) (b.) (ii) and (iv) (c.) (ii) and (iii) (d.) (i) and (ii)TS EAMCET 05.08.2021, Shift-I
(6.) In which one of the following sets all species show disproportionation reaction (a.) 2 ClO ,F ,MnO 2 2 4 − − and 2 Cr O2 7 − (b.) 2 Cr O ,MnO ,ClO 2 7 4 2 − − − and Cl2 (c.) MnO ,ClO ,Cl 4 2 2 − − and Mn3+ (d.) 2 ClO ,MnO ,ClO 4 4 2 − − − and F2 (JEE Main 2021, 31 Aug Shift-II) (7.) When 30 mL of H2 reacts with 20 mL of O2 to form water, what is leftover when the reaction ends ? (a.) 2 10 mLH (b.) 2 5 mLH (c.) 2 10 mLO (d.) 2 5 mLO AP EAMCET (Engg.) 18.9.2020 Shift-I (8.) The minimum amount of O g 2 ( ) consumed per gram of reactant is for the reaction (Given atomic mass : Fe O = = = = 56, 16,Mg 24,P 31 , ) C 12,H 1 = = ) (a.) C H3 8 (g) 2 +5O (g) 2 → 3CO (g) +4H O l 2 ( ) (b.) P4 (s) 2 +5O (g) → P O4 10 (s) (c.) ( ) 2 4Fe s 3O + (g) 2 3 → 2Fe O (s) (d.) ( ) 2 2Mg s O+ (g) →2MgO (s) [JEE Main 2019, 10 April Shift-II] (9.) 25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H O2 . This unknown hydrocarbon contains (a.) 20 g of carbon and 5 g of hydrogen (b.) 22 g of carbon and 3 g of hydrogen (c.) 24 g of carbon and 1 g of hydrogen (d.) 18 g of carbon and 7 g of hydrogen [JEE Main 2019, 12 April Shift-II] (10.) An example of a disproportionation reaction is (a.) 2 2MnO 10I 16H 2Mn 5I 8H O 4 2 2 − − + + + + → + + (b.) 2 2 2NaBr Cl 2NaCl Br + → + (c.) 4 2 4 2 2 2KMnO K MnO MnO O → + + (d.) 2 2CuBr CuBr Cu → + [JEE Main 2019, 12 April Shift-I] (11.) For a reaction, identify di-hydrogen (H2 ) as a limiting reagent in the following reaction mixture.
(a.) 56 g of N 10 g 2 + of H2 (b.) 35 g of N 8 g 2 + of H2 (c.) 14 g of N 4 g 2 + of H2 (d.) 28 g of N 6 g 2 + of H2 [JEE Main 2019, 9 April Shift-I] (12.) Which of the following sets of components form homogeneous mixture? (a.) Phenol + Water (b.) Sugar + Benzene (c.) Silver chloride + Water (d.) Ethyl alcohol + waterMHT CET-02.05.2019, SHIFT-III (13.) Which one of the following statements about the law of conservation of mass is correct? (a.) A given compound always contains exactly same proportion of elements (b.) When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are all room temperature (c.) Matter can neither be created nor destroyed (d.) Equal volumes of all gases at same temperature and pressure contain equal number of moleculesNDA (II)-2018 (14.) Volume of water needed to mix with 10 mL 3 10 NHNOH to get 3 0.1 NHNOHO is (a.) 1000 mL (b.) 990 mL (c.) 1010 mL (d.) 10 mL AIIMS-2017 (15.) The proposition 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as (a.) Avogadro's hypothesis (b.) Gay-Lussac's hypothesis (c.) Planck's hypothesis (d.) Kirchhoff's theoryNDA (II)-2017 (16.) On combustion of x g − of ethanol in bomb calorimeter, y-joules of heat energy is produced. The heat of combustion of ethanol (ΔHcomb ) is- (a.) ΔH x.J comb = − (b.) ΔH yJ comb = − (c.) 1 comb x ΔH 44Jmol y − = −  (d.) 1 comb y ΔH 44Jmol x − = −  BCECE-2017
(17.) When ' Z ' grams of calcium carbonate completely burnt in air gives 28 g of a solid compound. The mass of calcium carbonate used will be- (a.) 200 g (b.) 100 g (c.) 56 g (d.) 50 g BCECE-2017 (18.) Calculate the mass of oxygen obtained by complete decomposition of 10 kg of pure potassium chlorate. (Atomic mass : K 39, = = O 16 and C1 35.5 = ) (a.) 39.2 kg (b.) 392 kg (c.) 3.92 kg (d.) 3 kg SRMJEEE - 2016 (19.) Combination of one volume of nitrogen with three volumes of hydrogen produces (a.) one volume of ammonia (b.) two volumes of ammonia (c.) three volumes of ammonia (d.) one and a half volumes of ammoniaNDA (II)-2016 (20.) Match List-I with List-II and select the correct answer using the code given below the Lists: List-I List-II A. Heating of Camphor 1. Chemical B. Cooling of water 2. Evaporation vapour up to room temperature C. Cooking an egg 3. Condensation D.Formation of water 4. Sublimation vapour at room temperature (a.) A:4, B:3, C:1, D:2 (b.) A:4, B:1, C:3, D:2 (c.) A:2, B:1, C:3, D:4 (d.) A:2, B:3, C:1, D:4 NDA (II)-2016 (21.) 25 mL of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a titre value of 35 mL . The molarity of barium hydroxide solution was (a.) 0.07M (b.) 0.14M