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Q1. Ruthenium carbonyl is:
  •  Ru(CO)_6
  •  Ru(CO)_8
  •  Ru(CO)_4
  •  Ru(CO)_5
Solution
Ru forms penta carbonyl..

Q2.The correct order of ionic radii of Y^(3+),La^(3+),Eu^(3+) and Lu^(3+) is
  •  

  •  

  •  

  •    

Solution
Ionic radii of lanthanide(La^(3+)) decreases with increase in atomic numbe. Y^(3+)< Lu^(3+)< Eu^(3+)

Q3.  Rio Tinto process is used for extraction of:
  •   Au
  •  Al
  •  Ag
  •  Cu
Solution
It is a fact                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
Q4. Which oxide of manganese is amphoteric?
  •  MnO
  •  Mn_2 O_3
  •  Mn_2 O_7
  •  MnO_2
Solution
MnO_2 forms amphoteric oxide due to intermediate oxidation state.

Q5.Cu^(2+) ions would be reduced to cuprous ion if their solutions are mixed with an aqueous:
  •  KI solution
  •  KCl solution
  •  K_2 CO_3 solution
  •  K_2 SO_4 solution
Solution
 〖2Cu〗^(2+)+4KI⟶Cu_2 I_2+I_2+4K^+

Q6. Permanent magnets are generally made of alloys of
  •  Pb
  •  Co
  • Zn
  •  Mn
Solution
Permanent magnets are generally made up of alloys of Al, Ni and Co

Q7.Zinc does not show variable valency like d-block elements because
  •  It is low melting
  •  Two electrons are present in the outermost orbit
  •  d-orbital is complete
  •  It is a soft metal
Solution
C

Q8.Effective magnetic moment of Sc^(3+) ion is
  •  1.73
  •  0
  •  5.92
  •  2.83
Solution
Magnetic moment depends upon number of unpaired electrons. In Sc^(3+), there is no unpaired electron. So, its effective magnetic moment is zero

Q9.Which method is used to remove lead impurities from silver?
  •  Leaching with dilute NaCN solution
  •  Electrolytic purification using AgNO_3
  •  Leaching with dilute NaCN in presence of air
  •  Parkes process
Solution
Follow text.

Q10. Chromium compound used in tanning of leather is:
  •  Cr_2 O_3
  •  K_2 SO_4.Cr_2 (SO_4 )_3.24H_2 O
  •  CrO_2 Cl_2
  • CrCl_3
Solution
This is chrome alum used in tanning leather, mordant in dyeing and in photography for hardening of negative..

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