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Q1. Choose the correct reaction to prepare mercurous chloride (calomel)
  •  HgCl_2 + Hg □(→┴∆ )
  •  Hg + Cl_2⟶
  •  HgCl_2 + SnCl_2⟶
  •  Both (a) and (c)
Solution



Q2.One of the product formed when K_2 Cr_2 O_7 reacts with conc H_2 SO_4 in cold is
  •  CrO_4 Cl_2
  •  CrO_3
  •  Cr_2 (SO_4 )_3
  •  Cr_2 O_3
Solution



Q3.  Pig iron is converted into steel by reducing the amount of carbon contained in it, in a:
  •   None of these
  •  Blast furnace
  •  Pyrite burner
  •  Bessemer’s converter
Solution
In Bessemer’s converter impurities of C, Mn, Si, P in pig iron are oxidized to produce steel.

Q4. In the equation, 4M + 8CN^- + 2H_2 O + O_2 ⟶ 4[M(CN)_2 ]^- + 4OH^- Identify the metal M
  •  Copper
  •  Iron
  •  Zinc
  •  Silver
Solution

Q5.Colour in transition metal compounds is attributed to:
  •  d-d transition
  •  Absorption of light in the UV region
  •  Complete ns-subshell
  •  Small sized metal ions
Solution
 It is a reason for the given fact.

Q6. The one which has lowest ox. no. of Hg:
  •  Hg(NO_3 )_2
  •  Hg_2 Cl_2
  • HgCl_2
  •  Hg(NO_2 )_2
Solution
Hg has +1 oxidation state in Hg_2 Cl_2.

Q7.Which of the following is amphoteric?
  •  NiO
  •  V_2 O_5
  •  CuO
  •  V_2 O_3
Solution
CuO is amphoteric.

Q8.The spin only magnetic moment of Mn^(4+) ion is nearly
  •  3 BM
  •  4 BM
  •  5 BM
  •  6 BM
Solution
The electronic configuration of Mn is 25Mn =[Ar] 3d^5 4s^2 Mn^(4+) =[Ar]3d^3 Thus, three unpaired electrons are present . Spin only magnetic moment , μ=√(n(n+2)) n=3 μ =√(3(3+2)) = √15 =3.87 ≈ 4 BM

Q9.The gas obtained by reactions of K_4 Fe(CN)_6 with conc. H_2 SO_4 is
  •  CO_2
  •  NO_2
  •  H_2 S
  •  CO
Solution



Q10. Which of the following types of metals form the most efficient catalysts?
  •  Alkaline earth metals
  •  Transition metals
  •  Alkali metals
  • All of these
Solution
Many of the d-block (transition) elements and their compounds act as catalyst . Catalytic property is probably due to the utilisation of (n-1) d-orbitals or formation of interstitial compounds

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