multiple choice questions on mole

MCQs chapter - 1        

1          the volume occupied by 60 g of NH₃ at stp is approximately,

            1; 60 dm³                     2; 69 dm³         3; 79 dm³                     4; 89dm³     

2          Avogadro,s number of atoms are present in,

            1; 16 g CH₄                  2; 10 g NH₃      3; 4 g He                      4; 28 g O₂  

                    

3          which one of the following property is different for one moles of a gas ,

            1; volume                    2;molecules3; mass                  4; all

                                           

 4         which one of the following property is different for one moles of a gas ,

            1; volume                    2;molecules3; mass                  4; all

5    The percentage of oxygen in copper sulphate penta hydrate is                                           

(1) 25.6%                    (2) 57.7%                     (3) 40.1%                    (4) 90.1%  

                                         

6    the percentage of carbon in benzene is,

            1; 50%                         2; 75 %            3; 92%                         4; 8% 

                                      

7          Which of the following has highest percentage of nitrogen?                                   

(1)  (NH₄)₂SO₄             (2)   NH₄H₂PO₄            (3) (NH₄)₂HPO₄           (4) (NH₄)₃PO₄

                                    

8          0.1 mole of Na₃ PO₄     completely ionized    in   water to produced Na⁺                             

            (1) 6.02x10²³               (2)1.806x10²³   (3) 3x6.02x10²³          (4)1.806x10²²   

       

9          A Limiting reactant is one                   

            (1), which produce more product                    (2), which consumed earlier               

            (3) Not effect the yield                                    (4) increase the yield.    

                                  

10        In stoichometry we study quantitativerelationship among various                              

             (1) Reactants                        (2) products   (3) Reactants and products   (4) all these.  

 11       Which one of the following has same  empirical and molecular formula?

            (1) C₆ H₁₂ O₆                (2) CH₃ COOH       (3) C₆ H₆               (4) CH ₃ CH₂ OH

12        Actual yield is less than theoretical yield. For this statement which one of the following is incorrect.

            (1) Side Reaction         (2) Reversibility    (3) Formula wt          (4) Mechanical Loss

 13       Elements having similar chemical properties will have.

            (1) Similar Physical State                                 (2) Similar Electronic configuration                

            (3) Similar Oxidation number              (4) Similar Atomic Size.          

                  

 14       Which is not a molecule.                                

            (1) NaCl                       (2) H₂ O                       (3) HCl                        (4)CH₄

 15       A Compound containing 30.6 % N and its molar mass is 228.3 How many N-atoms are there in the molecule of the compound.                                                                 

            (1) 6                             (2) 5                           (3) 4                               (4) 3.  

 16       Which of the   following is a substance                                                                                 

(1) Sea water                            (2) Brass            (3) Tap water                         (4) graphite                                                            

17        Cadet asadullah says that all of   the    following  are mixture except                                     

(1) Gasoline                       (2) Bronze   (3) Plaster of Paris            (4) brass                

18        CH_4,  NH₃ , HF and Na⁺,all of these have

            (1) same mass  (2) same no of proton              (3) same no of electrons  (4) same no of neutrons.

 19       The relative atomic mass of Cl is 35.5 and has two isotopes Cl³⁵₁₇ and Cl³⁷₁₇ . What is the percentage of Cl³⁵₁₇ in the mixture.

            (1) 2.5 %                     (2) 25 %                      (3) 75 %                      (4) 7.5 %

 20       Species have the same no of electrons are       called.

            (1) Iso electronic          (2) Isobar                     (3) Isomer                    (4) Isotones.

 21       In a sample of thio sulphate (S₂ O₃)^-2 ions, If the mass of S – is 32, then what is the mass of O₂.        

            (1) 8 g                          (2) 4.8 g                                  (3) 2.4 g                        (4) 24 g.

22        When an electron is added to a uni positive ion we get.

            (1) Di positive ion   (2) uni negative ion  (3) neutral atom       (4) molecule. .

 23       the massof 5 moles of an element is 60 grams. The element may be,

            1; Oxygen                    2; Carbon         3; Magnesium              4; Iron                     

24        In the reaction ,                        4 NH₃   +  5O₂   →       4NO  +  6H₂O when one mole of ammonia and one mole             of oxygen are made to react completely then                                     

            (1)1.0 mole of water is produced                     (2) all oxygen is consumed.                            

            (3) one mole of NO is formed                         (4) all ammonia is consumed                     .                                                    

 25       how many moles of atoms are there in 1 mole of Ca₃(PO₄)₂.

            1; 2 moles                    2; 8 moles        3; 10 moles                  4; 13 moles