MCQ
Which one of the following statements about starch is correct?
- AIt occurs in the cell walls of plants.
- BIt is a disaccharide.
- CIt is present in roots and seeds of plants.
- DIt gives a red orange precipitate on boiling with Fehlings solution.
Explanation:
Starch is the polysaccharide which is present in roots and seeds of plants.
It is present in all photosynthesis plants. It is present is seeds in form of granules.
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Assertion $A:$ $3.1500\,g$ of hydrated oxalic acid dissolved in water to make $250.0\,mL$ solution will result in $0.1\,M$ oxalic acid solution.
Reason $R:$ Molar mass of hydrated oxalic acid is $126\,g\,mol ^{-1}$.
In the light of the above statements, chose the correct answer from the options given below:
| List $I$ (Coordination entity) | List $II$ (Wavelength of light absorbed in $nm$) |
| $A$ ${\left[ CoCl \left( NH _3\right)_5\right]^{2+}}$ | $I$ $310$ |
| $B$ ${\left[ Co \left( NH _3\right)_6\right]^{3+}}$ | $II$ $475$ |
| $C$ ${\left[ Co ( CN )_6\right]^{3-}}$ | $III$ $535$ |
| $D$ ${\left[ Cu \left( H _2 O \right)_4\right]^{2+}}$ | $IV$ $600$ |
Choose the correct answer from the options given below
$(I)$ $ Ph -COCH_3$
$(II)$ $CH_3 -CO -CH_3$
$(III)$ $CH_3 -CHO$
$(IV)$ $Ph -COCH_2 -CH_3$
$I.$ They activate many enzymes
$II.$ They participate in the oxidation of glucose to produce $ATP$
$III.$ Along with sodium ions, they are responsible for the transmission of nerve signals