SOME BASIC CONCEPTS OF CHEMISTRY Quiz-12

 

SOME BASIC CONCEPTS OF CHEMISTRY Quiz-12

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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 separation of Cu^(2+) and Cd^(2+) in 2nd group of qualitative analysis of cations tetrammine copper (II) sulphate and tetraammine cadmium (II) sulphate react with KCN to form the corresponding cyanide complexes, which one of the following pairs of the complexes and their relative stabilities enables the separation of Cu^(2+) and Cd^(2+)?  :

•  K_3 [Cu(CN)_4] : less stable and K_2 [Cd(CN)_4] : more stable
•  K_3 [Cu(CN)_4] : more stable and K_2 [Cd(CN)_4] : less stable
•  K_2 [Cu(CN)_4] : less stable and K_2 [Cd(CN)_4] : more stable
•  K_2 [Cu(CN)_4] : more stable and K_2 [Cd(CN)_4] : less stable

Solution
option b

Q2.Aqueous solution of a mixture contains Br^- and I^-. On passing Cl_2 gas and adding CHCl_3, then organic layer will be

•  Violet
•  Reddish brown
•  Colourlesss
•  Blue

Solution

Q3.OFerric alum gives red colour with NH_4 SCN due to formation of  

•  2Al(SCN)_3
•  [Fe(SCN)_3 ]^-
•  Fe(SCN)_3
•  [Fe(SCN)]^(2+)

Solution

Q4.Ag_2 S is soluble in NaCN due to formation of 

•  Na[Ag(CN)_2 ]
•  Ag(CN)_2
•  Na_2 [Ag(CN)_3 ]
•  Na_2 [Ag(CN)_2]

Solution

Q5.When 8.3 g copper sulphate (249.5) reacts with excess of potassium iodide then the amount of iodine liberated is

•  

  42.3 g

•  24.3 g
•  4.23 g
•  2.43 g

Solution
 

Q6.CO,CO_2,C_2 O_3 follow

•  Law of definite proportion
•  Law of multiple proportion
• Law of conservation of mass
•  All of the above

Solution

Q7.10 mLof NaHC_2 O_4 is oxidised by 10 mL of 0.02 MMnO_4^⊖. Hence, 10 mL of NaHC_2 O_4 is neutralised by

•  10 mL of 0.1 M NaOH
•  10 mL of 0.02 M NaOH
•  10 mL of 0.1 Ca(OH)_2
•  10 mL of 0.05 N Ba(OH)_2

Solution

Q8.Aqueous solution of A gives yellow ppt with aq K_2 CrO_4. A may contain

•  Pb^(2+) or Ag^+ or Ba^(2+)
•  Pb^(2+) or Ba^(2+)
•  4Ag^+ or Ba^(2+)
•  Pb^(2+) or Ag^+

Solution

Q9. Na_2 SO_3 .xH_2 O has 50% H_2 O by mass. Hence, x is

•  4
•  5
•  6
•  7

Solution

Q10.A sample of ammonium phosphate (NH_4 )_3 PO_4 contains 3.18 moles of H-atoms. The number of moles of oxygen atoms in the sample is  

•  0.265
•  0.795
•  1.06
• 3.18

Solution

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