• VO→ VO
• Na → Na
• CrO→ CrO
• Zn→Zn
• #### 2.  KMnO reacts with oxalic acid according to the equation 2MnO + 5CO + 16H+ → 2Mn +10CO+ 8H O Here 20 mL of 0.1 M KMnO is equivalent to

• 50 mL of 0. 5 M CHO
• 20 mL of 0. 1 M CHO
• 20 mL of 0. 5 M CHO
• 50 mL of 0. 1 M CHO

• -1
• -3
• +3
• +5
• #### 4.  What is n-factor?

• Equal to product of Number of moles of electrons when Lost or gained by one mole of reductant or oxidant
• When Number of moles of electrons Lost or gained by one mole of reductant or oxidant is not same.
• Equal to Number of moles of electrons Lost or gained by one mole of reductant or oxidant
• None of the above

• MnO2
• K2MnO4
• Mn3O4
• KMnO4.
• #### 6.  The oxidation process involves

• Increase in oxidation number
• Decrease in oxidation number
• No change in oxidation number
• none of the above

• Copper
• Magnesium
• Iron
• Silver

• 8
• 6
• 4
• 10
• #### 9.  The colourless solution of silver nitrate slowly turns blue on adding copper chips to it because of

• Dissolution of Copper
• Oxidation of Ag→ Ag
• Reduction of Cu ions
• Oxidation of Cu atoms.
• #### 10.  A standard reduction electrode potentials of four metals are A = -0. 250 V, B = -0. 140 V, C = -0. 126 V, D = -0. 402 V The metal that displaces A from its aqueous solution is:

• A
• B
• C
• D
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