Mcqs (mole concepts)

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        CH4,  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 

 

 

 

 

 

Key

1;(3)                 2; ;(3)               3; ;(3)               4; ;(3)               5; ;(2)               6; ;(3)               7; ;(4)  

 

8; ;(2)               9; ;(2)               10; (3)              11; ;(4)             12; (3)              13; ;(2)             14; ;(1)

 

15; ;(2)             16;(4)               17; (3)              18; (3)              19; ;(3)             20; ;(1)             21; ;(4)

 

22; ;(3)             23; ;(2)             24; ;(2)             25; ;(4)

 

 

Related Questions