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1.

Which among the following equations represents in the reduction reaction taking place in lead accumulator at the positive electrode, while it is being used as a source of electrical energy?

A) $Pb\rightarrow Pb^{2+}$

B) $Pb^{4+}\rightarrow Pb$

C) $Pb^{2+}\rightarrow Pb$

D) $Pb^{4+}\rightarrow Pb^{2+}$

2.

A  molecule of stachyose contains how many carbon atoms?

A) 6

B) 12

C) 18

D) 24

3.

The amino acid, which is basic in nature is

A) histidine

B) tyrosine

C) proline

D) valine

4.

Which of the following co-ordinate complexes is an exception to EAN rule?

(Given atomic number Pt=78, Fe=26, Zn=30, Cu=29)

A) $[Pt(NH_{3})6]^{4+}$

B) $[Fe(CN)_6]^{4-}$

C) $[Zn(NH_3)_4]^{2+}$

D) $[Cu(NH_3)_4]^{2+}$

5.

What is the actual volume occupied by water molecules present in 20 cm3 of water ?

A) 20 $cm^{3}$

B) 10 $cm^{3}$

C) 40 $cm^{3}$

D) 24.89 $cm^{3}$

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