`SO_(2)` `CrO_(3)` `SO_(3)` `Al_(2)` `O_(3)` No. of compounds that acts as oxidant as well as reluctant is
(a)2
(b)1
(c)4
(d)3

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

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 ?

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)

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

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 .

Three different solutions of oxidising agents KMnO_(4),K_(2)Cr_(2)O_(7) " and "I_(2) is titrated separately with 0.158 gm of Na_(2)S_(2)O_(3) . If molarity of each oxidising agent is 0.1 M and reactions are : I. MnO_(4)^(-)+S_(2)O_(3)^(2-) toMnO_(2)+SO_(4)^(2-) II CrO_(7)^(2-)+S_(2)O_(3)^(2-) to Cr^(3+)+SO_(4)^(2-) III. I_(2)+S_(2)O_(3)^(2-) to S_(4)O_(6)^(2-)+I^(-)

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 Alum: K_(2)SO_(4) Al_(2)(SO_(4))_(3). 24 H_(2)O Which metal can replace Al

Al_(2)(SO_(4))_(3)+NH_(4)OH to X Select the correct statement(s) about compound X: