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

H_(2)S acts only as reductant, whereas SO_(2) acts as oxidant and reductant both .

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

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 .

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 ?

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

From - SO_(2), SiO_(2), Al_(2)O_(3), MgO, CO, Na_(2)O - Select an oxide which dissolves in water forming an acid

In the reaction 8Al+3Fe_(3)O_(4)rarr 4Al_(2)O_(3)+9Fe the number of electrons transferred from the reductant to the oxidant is

Dioxygen directly reacts with nearly all metals annd non-metals except some metals (e.g., Au, Pt) and some noble gases and form oxide(s). Oxides can be simple (e.g., MgO, Al_(2)O_(3) ) or mixed (Pb_(3)O_(4),Fe_(3)O_(4)) . Simple oxides can be classified on the basic of their acidic, basic or amphoteric character. an oxide that combines with water to give an acid is termed acidic oxide (i.e., SO_(2),Cl_(2)O_(7),CO_(2),N_(2)O_(5) ). for example, SO_(2) combines with water to give H_(2)SO_(3) , an acid. Q. If, Then select correct statement with respect to gas 'Q'?

Na_(2)CrO_(4)+HCl to H_(2)Cr_(2)O_(7)+Na_(2)SO_(4)

Na_(2)CrO_(4)+HCl to H_(2)Cr_(2)O_(7)+Na_(2)SO_(4)