12th class (Fsc) Chemistry unit 6 MCQs
76. Formula of Chromyl chloride is:
a. Cr2OCI3
b. Cr2OCI2
c. CrOCI2
d. CrO2CI2
77. Hydrogenation of unsaturated oils is done by using:
a. Vanadium pentaoxide
b. Finally divided nickel
c. Copper
d. Finally divided iron
78. Pick the correct statement:
a. Monodentate ligands form the chelates
b. Chelates are usually more stable than ordinary complexes
c. Chelates ligands form the structure
d. Ordinary complexes are more stable than chelates
79. Oxidation state of Mn in KMnO4 , K2MnO4 ,MnO and MnSO4 is in the order:
a. +7,+6,+4,+2
b. -7,+6,+2,+4
c. +4,+6,+7,+2
d. +6,+7,+2,+4
80. Which one pair has the same oxidation state of Fe?
a. FeSO4 and FeCI2
b. FeSO4 and FeCI2
c. Fe (SO4 )3 and FeSO4
d. FeCI2 and FeCI3
81. Which pair of transition elements shows abnormal electronic configuration?
a. Zn and Cu
b. Se and Ze
c. Cu and Cr
d. Cu and Se
82. Oxidation state of Fe in K3 [Fe(CN)6 ] is:
a. -6
b. +2
c. -3
d. +3
83. The percentage of carbon is differenet types of iron products is in the order of:
a. Cast iron>steel>wrought iron
b. Cast iron>wrought iron>steel
c. Cast iron>steel>Wrought
d. Wrought iron>steel>cats iron
84. [Ti(H2O)6 ]+3 transmits:
a. Red and white light
b. Yellow and red light
c. Red and blue light
d. Yellow and blue light
85. Electronic configuration of gold [Au79] is:
a. [Xe]4f10 .5d10 ,6s2
b. [Xe]4f14 .5d10 ,6s1
c. [Xe]4f14 .5d10 ,6s2
d. [Xe]4f14 .5d9 ,6s2
86. The anomalous electronic configuration shown by chromium and copper among 3-d series of elements is due to:
a. Stability associated with this configuration
b. Colors of ions of these metals
c. Complex formation tendency of metals
d. Variable oxidation states of metals
87. Which element of 3d series of periodic table shows the electronic configuration of 3d6 ,4s2 ?
a. Zinc
b. Copper
c. Nickel
d. Cobalt
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