Oxidation number of oxygen in potassium super oxide (KO₂) is:

1. – 2

2. – 1

3. – 1/2

4. – 1/4

The oxidation state of Cu in  ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{\mathrm{O}}_7$  is :

(Yttrium = +3)

In a balanced equation
$H_{2}S{O}_4+xHI\to H_{2}S+y{I}_2+z{H}_{2}O$, the values of x, y, z are:

When manganese dioxide (MnO₂) is fused with potassium hydroxide (KOH),
a coloured compound is formed. What is the product and its colour?
(1) $K_{2}Mn{O}_4$, purple green

(2) $KMn{O}_4$, purple

(3) $M{n}_2{O}_3$, brown

(4) $M{n}_3{O}_4$ black

A compound contains three elements A, B and C, if the oxidation number of A =+2, B =+5 and C =-2, the possible formula of the compound is :

1. $A_3{\left(B_{4}C\right)}_2$                                 2. $A_3{\left(B{C}_4\right)}_2$

3. $A_2{\left(B{C}_3\right)}_2$                                 4.  $AB{C}_2$

In an alkaline medium, chlorine dioxide (ClO₂) oxidizes hydrogen peroxide (H₂O₂) to oxygen gas
while itself getting reduced to the chloride ion.

What is the equivalent mass of $I{O}_4^{-}$ when it is converted into I₂ in acid medium

(1) M/6

(2) M/7

(3) M/5

(4) M/4

The equivalent weight of phosphoric acid (H₃PO₄) in the reaction $NaOH+H_{3}P{O}_4\to Na{H}_{2}P{O}_4+H_{2}O$ is

(1) 25

(2) 49

(3) 59

(4) 98

If 1.2 g of metal displace 1.12 litre hydrogen at normal temperature and pressure, equivalent weight of metal would be 

(1) 24

(2) 12

(3) 1.2 $÷$ 11.2

(4) 1.2 $\times$ 11.2

In the equation

$H_{2}S+2HN{O}_3\to 2H_{2}O+2N{O}_2+S$

The equivalent weight of hydrogen sulphide is [BVP 2003]

(1) 16

(2) 68

(3) 34

(4) 17