JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers)

     JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers)
 JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers)

JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers)
                                                            JEE Mains -Mole Concept and Stoichiometry Previous Year Questions (with Answers)

These are Jee Mains previous year questions for chemistry -MOLE CONCEPT, BALANCING OF REDOX REACTION and STOICHIOMETRY

1.       25 ml of a solution of barium hydroxide on titration with 0 .1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was 

(1) 0.14  (2) 0.28 (3) 0.35 (4) 0.07                                                                                 (MAINS-2003)

Ans :   (4.)

2.       The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium hydroxide solution hydroxide solution for complete neutralization. The organic compound is
 (1) acetamide
(2) thiourea
 (3) urea
 (4) benzamide                                                                                                    (MAINS-2004)

Ans :   (3.)

3.       Excess of KI reacts with CusO4 solution and then Na2S2O3  a solution is added to it. Which of the statements is incorrect for this reaction?
(1) Cu2I2 is reduced
(2) Evolved l2 is reduced
 (3) Na S2O3 is oxidized
(4) CuI2 is formed                                                                                              (MAINS-2004)
Ans :   ( 3.)

4.       To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is

(1) 10 ml (2) 60 mL (3) 40 ml(4) 20 ml                                                             (MAINS-2004)

Ans :   (4.)

5.       6.02 x  1020 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is

(1) 0.001 M  (2) 0.1 M  (3) 0.02 M  (4) 0.01 M                                                 (MAINS-2004)
Ans :  (4.)

6.       If we consider that 1/6, in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
 (1) Decrease twice
(2) Increase two fold
(3) Remain unchanged
 (4) Be a function of the molecular mass of the substance                               (MAINS-2005)

Ans :  (3.)

7.       Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?

(1) 1.20 M  (2) 1.50 M  (3) 1.344 M (4) 2.70 M                                               (MAINS-2005)
Ans :  (3.)

8.       Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4?
(1) 2HI+ H2SO4→ I2+SO2+2H2O
 (2) Ca(OH)2+ H2SO4 → CaSO4 + 2H2O
(3) NaCI+ H2SO4 → NaHCO4  +HCI
(4) 2PC15 + H2SO4→2 POCI2 + 2HCI +SO2CI2                                             (MAINS-2006)

Ans : (1.)

9.       Density of a 2.05 M solution of acetic acid in water is 1.02 g/ mL. The molality of the solution is

(1) 1.14 mol/ kg (3) 2.28 mol/ kg (2) 3.28 mol /kg (4) 0.44 mol/ kg                (MAINS-2006)
Ans:  (2.)

10.   How many moles of magnesium phosphate, Mg (PO4), will contain 0.25 mole of oxygen atoms?
(1) 0.02  (2) 3.125 x 10-2  (3) 1.25 x 10-2   (4) 2.5 x 10-2                                 (MAINS-2006)
Ans :  (4.)

11.   In the reaction. 2Al(s) + 6HCl(s) - 2Al3+ (aq)+ 6Cl- +3H2(g)
 (1) 6 L HCl (aq) is consumed for every 3L H2(g) produced
(2) 33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts (3) 67.2 L H2(g) at STP is produced for every mole Al that reacts
 (4)11.2 H2(g) at STP is produced for every mole HCl(aq) consumed              (MAINS-2007)
Ans :  (4.)

12.   Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out the presence of HCI, because HCI
 (1) gets oxidised by oxalic acid to chlorine
 (2) furnishes H+' ions in addition to those from oxalic acid
(3) reduces permanganate to Mn2+
(4) oxidises oxalic acid to carbon dioxide and water                                       {MAINS-2008)
Ans :  (3.)

13.   29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCL solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is
(1) 59.0    (2) 47.4   (3) 23.7 (4) 29.5                                                                 (MAINS-2010)
Ans :  (3.)

14.   What is the best description of the change that occurs when Na2O(s) is dissolved in water?
 (1) Oxidation number of oxygen increases
(2) Oxidation number of sodium decreases
 (3) Oxide ion accepts sharing in a pair of electrons
(4) Oxide ion donates a pair of electrons                                                            (MAINS-2011)
Ans :4.

15.   The mass of potassium dichromate crystals required to oxidize 750 cm3 of 0.6 M Mohr's salt solution is (Given molar mass : potassium dichromate = 294, Mohr's salt = 392)

(1) 2.2 g (2) 0.49 g (3) 0.45 (4) 22.05 g                                                              (MAINS-2011)
Ans : (4.)

16.   Consider the following reaction:
XMnO-4   +   yC2O42-  +zH+ →  Mn2+ +2yCO2, +z/2  H2O

The values of x, y and z in the reaction are respectively

(1) 2, 5 and 8   (2) 2, 5 and 16    (3) 5,2 and 8   (4) 5,2 and 16                          (MAINS-2013)
Ans :  (2.)

17.   A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is:

               (1) C3H4             (2) C6H5            (3) C7H8.   (4) C2H4                                     (MAINS-2013)
Ans :   (3.)

18.   The molarity of a solution obtained by mixing 750 ml of 0.5 (M) HCI with 250 mL of 2(M)HCI will be:

              (1) 1.00 M           (2) 1.75 M       (3) 0.975 M      (4) 0.875 M                           (MAINS-2013)
Ans :  (4.)

19.   For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL M/10 of  sulphuric acid. The unreacted acid required 20 ml of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:
                (1) 3%            (2) 5%               (3) 6%          (4) 10%                                       (MAINS-2014)
Ans :  (4.)

20.   The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (Mol. Wt. 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?

                (1) 1/206             (2) 2/309                   (3)1/ 412          (4)1/103                     (MAINS-2015)
Ans  : (3)

21.   3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06 N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is:

               (1) 36 mg     (2) 42 mg       (3) 54 mg   (4) 18 mg                                             (MAINS-2015)
Ans     : (4.)

22.   1 gram of a carbonate (M2CO3) on treatment with excess HCI produces 0.01186 mole of CO2..The molar mass M2CO3 of in g mol-1 is:

         (1) 84.3              (2) 118.6                (3) 11.86              (4) 1186                             (MAINS-2017)
Ans  :  ( 1.)

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