Which from following molecules exhibits lowest thermal stability?

Identify weakest halogen acid from following.

Identify strongest oxoacid of halogen from following.

What is the number of electrons around sulfur in $$\mathrm{H}_2 \mathrm{SO}_4$$ molecule?

Which from following molecules exhibits highest acidic nature?

Which carbon atoms (numbered from $$C_1$$ to $$C_6$$ ) are involved in the formation of ring structure of glucose?

Oxidation state of iodine in I$$_3^-$$ is

Which among the following noble gases reacts with fluorine to give crystalline fluorides?

Which among the following is NOT the use of SO$$_2$$ gas?

What is the number of allotropes of selenium?

Which from following elements of halogen family is in liquid state at room temperature?