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SOME BASIC CONCEPTS OF CHEMISTRY Quiz-21

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1.Normality of a solution that contains 12.64 g of KMnO_4 in 500 mL of solution to be used in the reaction that produces 〖K_2 MnO〗_4ion as the reducing product is  :
  •  0.16 N -
  •  0.32 N
  •  0.80 N
  •  0.08 N
Solution




Q2.Of the following oxides, all are soluble, in NaOH(aq) except
  •  ZnO
  •  Al_2 O_3
  •  Fe_2 O_3
  •  SnO_2
Solution



Q3.One litre of a sample of hard water contains 5.55 mg of CaCl_2 and 4.75 mg of MgCl_2. The total harness in terms of ppm of CaCO_3 is  
  •  5 ppm
  •  10 ppm
  •  20 ppm
  •  None of these
Solution



Q4.In iodometric titration, hypo is oxidized to
  •  S_4 O_6^(2-)
  •  SO_3^(2-)
  •  SO_4^(2-)
  •  SO_2
Solution
option a
Q5.Mass of one atom of X is 2.66×10^(-23) g, then its 32 g is equal to
  •  32×2.66×10^(-23) mol
  •  32/(2.66×10^(-23)×6.02×10^23 ) mol
  •  (32×2.66×10^(-23))/(6.02×10^23 ) mol
  •  None of the above
Solution
 



Q6.In a glass-tube, there are 18 g of glucose. 0.08 mole of glucose is taken. Glucose left in the glass-tube is
  •  0.10 g
  •  17.92 g
  • 3.60 mol
  •  3.60 g
Solution



Q7.Stock phosphoric acid solution is 85% H_3 PO_4 (by mass of solution) and has a specific gravity of 1.70. Hence, molarity of H_3 PO_4solution is
  •  8.51 M
  •  1.70 M
  •  14.74 M
  •  7.37 M
Solution



Q8.From the complete decomposition of 20 g CaCO_3 at STP, the volume of CO_2 obtained is
  •  2.24 L
  •  4.48 L
  •  20 L
  •  22.4 L
Solution

 



Q9.Which element has maximum percentage in iron (III) sulphate (IV)?
  •  Iron
  •  Sulphur
  •  Oxygen
  •  Equal
Solution



Q10.Consider the following laws of chemical combination with examples Law of multiple proportion : N_2 O,NO,NO_2 Law of reciprocal proportion : H_2 O,SO_2,H_2 S Which is correct with examples?  
  •  I and II
  •  I only
  •  II only
  • None of the above
Solution



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