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SOME BASIC CONCEPTS OF CHEMISTRY Quiz-8

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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.In the mixture of (NaHCO_3+Na_2 CO_3), volume of HCl required is x mL with phenolphthalein indicator and then y mL with methyl orange indicator in same titration. Hence, volume of HCl for complete reaction of Na_2 CO_3 is:  :
  •  2x
  •  y
  •  x/2
  •  (y-x)
Solution




Q2.HF attacks glass (Na_2 SiO_3) forming
  •  Na_2 SiF_4
  •  Na_2 SiF_3
  •  Na_2 SiF_6
  •  H_4 SiO_4
Solution




Q3.When 2 g of gas A is introduced into an evacuated flask kept of 25℃, the pressure was found to be 1 atmosphere. If 3 g of another gas B is then added to the same flask, the pressure becomes 1.5 atm. Assuming ideal behavior, the ratio of molecular weights (M_A:M_B ) is 
  •  1:3
  •  3:1
  •   2:3
  •  3:2
Solution



Q4.If equal volumes of 1 M KMnO_4 and 1 M K_2 Cr_2 O_7 solutions are allowed to oxidise Fe (II) to Fe (III) in acidic medium, then Fe (II) oxidized will be  
  •  4More by KMnO_4
  •  More by K_2 Cr_2 O_7
  •  Can’t be determined
  •  11 % Fe,8 %,Fe_3 O_4
Solution
option b

Q5.The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is:
  •  

     XY

  •  X_2 Y
  •  XY_2
  •  X_2 Y_3
Solution
 




Q6.Number of millilitres of a 1.6% BaCl_2 (w/V) solution which required to precipitate the sulphur as BaSO_4 in a 0.60 g sample that contains 12% S is
  •  58.50 mL
  •  14.63 mL
  • 29.25 mL
  •  21.00 mL
Solution




Q7.All the oxygen in a 0.5434 g sample of a pure oxide of iron is removed by reduction in a stream of H_2. The loss in weight is 0.1210 g. hence, formula of the iron oxide is (Fe=56)
  •  FeO
  •  Fe_2 O_3
  •  Fe_3 O_4
  •  FeO_2
Solution




Q8.A certain metal sulphide MS_2 is used extensively as a high temperature lubricant. If MS_2 is 40.00% by mass sulphur, atomic mass of M is
  •  60
  •  96
  •  100
  •  80
Solution




Q9. The weight of 1 L of ozonised oxygen at STP was found to be 1.5 g. When 100 mL of this mixture at STP was treated with turpentine oil, the volume was reduced to 90 mL. The molecular weight of ozone is
  •  49
  •  47
  •  46
  •  47.9
Solution


 

Q10. The empirical formula of a compound of carbon with hydrogen is CH_2 .1 L of this gaseous compound has mass equal to that of 1 L N_2 under standard state. Thus, molecular formula of the compound is  
  •  C_3 H_6
  •  b) C_2 H_4
  •  C_4 H_8
  • C_5 H_10
Solution



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