Cow's milk is slightly yellowish in colour due to the presence of

The amount of usable energy,which is available for doing work,when the temperature and pressure are uniform throughout the system is called

In organic compounds,the primary chemical bonds are formed between which atoms?

Match the items in Column-$I$ with Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$(A)$ Aspartic acid	$(i)$ Two $\alpha$-chains and two $\beta$-chains
$(B)$ Haemoglobin	$(ii)$ $FMN$
$(C)$ Cytoplasm	$(iii)$ Nitrogen fixation
$(D)$ Azotobacter	$(iv)$ Site of protein synthesis
	$(v)$ Polar and negatively charged amino acid

What are the charges on $H$ and $O$ atoms in a water molecule, respectively?

Which one of the following is the dominant intracellular cation?