`SO_(2)` `CrO_(3)` `SO_(3)` `Al_(2)O_(3)` No. of compounds that acts as oxidant as well as reductant is

Compound that acts as oxidant as well as reductant

Assertion (A): O_(3) can act as an oxidising agent as wll as a reducing agent, but SO_(2) can act only as an oxidant. Reason (R ): The oxidation number of O in O_(3) is zero, and the oxidiation number of S in SO_(2) is +4 .

3MnO_(2) + 4Al rarr 3 Mn + 2Al_(2)O_(3)+ heat. Identify the substances undergone oxidation and reduction reactions.

The depression of freezing points of 0.05 molal aqueous solution of the following compounds are measured. 1. NaCl 2. K_(2)SO_(4) 3. C_(6)H_(12)O_(6) 4. Al_(2)(SO_(4))_(3) Which one of the above compounds will exhibit the maximum depression of freezing point ?

BeO,Al_(2)O_(3),SnO_(2),SiO_(2),Sb_(2)O_(3),PbO are __ oxides

0.078 g Al(OH)_(3) . is dehydrated to Al_(2)O_(3) . The Al_(2)O_(3) so obtained reacted with 6 milli-equivalent of HCl . The equivalent of AlCl_(3) produced during the reaction are:

Assertion : Out of CrO_(3)& Al_(2)O_(3), CrO_(3) having lower melting point than Al_(2)O_(3) . Reason: Oxidation state of Cr in CrO_(3) is high

Among Al_(2)O_(3),SiO_(2),P_(2)O_(5) and SO_(3) the correct order of acid strength is :-