Amongst the following species that have an atom in (+6) oxidation state is-

1. Mn${\mathrm{O}}_4^{-}$

2. Cr$(\mathrm{CN}{)}_6^{3-}$

3. Ni${\mathrm{F}}_6^{2-}$

4. CrO₂Cl₂

1.575 gm crystalline oxalic acid C₂H₂O₄· XH₂O$\mathrm{<span\; style="font-family:\; -apple-system,\; BlinkMacSystemFont,\; "Segoe\; UI",\; Roboto,\; "Helvetica\; Neue",\; Arial,\; "Noto\; Sans",\; sans-serif,\; "Apple\; Color\; Emoji",\; "Segoe\; UI\; Emoji",\; "Segoe\; UI\; Symbol",\; "Noto\; Color\; Emoji";\; font-size:\; 1rem;">is\; dissolved\; in\; water\; and\; diluted\; to\; 250\; ml.\; 25ml\; of\; this\; solution\; is\; completely\; neutralised\; with\; 250ml\; N/10\; NaOH.\; The\; value\; of\; \text{'}x\text{'}\; is </span>}$

1. Zero

2. 1

3. 2

4. 5

N₂H₄ + IO₃^- + 2H⁺ + Cl^- $\to$ICl + N₂ + 3H₂O

The equivalent masses of N₂H₄ and KIO₃ respectively are :-

1. 8 and 35.6

2. 8 and 87

3. 8 and 53.5

4. 16 and 53.5

What is the equivalent weight of H₃PO₃ in the following disproportionation reaction:-

H₃PO₃ $\to$H₃PO₄ + PH₃

1. $\frac{M}{6}$   

 2. $\frac{M}{2}$ 

3.  $\frac{2M}{3}$ 

 4. $\frac{M}{3}$

Equivalent weight of a metal oxide is 20, the equivalent weight of sulphate of same metal will be 

(1) 60

(2) 69

(3) 108

(4) 54

An excess of NaOH was added to 100 mL of a ferric chloride solution. This caused the precipitation of 1.425 g of Fe(OH)₃. Calculate the normality of the ferric chloride solution

(1) 0.20 N

(2) 0.50 N

(3) 0.25 N

(4) 0.40 N

The pair of compounds that can exist together is

1. FeCl₃, SnCl₂             

2. HgCl₂, SnCl₂

3. FeCl₂, SnCl₂             

4. FeCl₃, KI

What enables HNO₂ to act as both a reducing and an oxidizing agent, in contrast to HNO₃ which only acts as an oxidizing agent?

1. Hybridization of N-atom in HNO₂

2. Maximum oxidation state of N - atom in HNO₂

3. Lower oxidation state of N-atom in HNO₂

4. Higher Electronegativity of N -atom in HNO₃

A brown ring complex compound is formulated as $\left[Fe{\left(H_{2}O\right)}_{5}NO\right]S{O}_4.$ The oxidation state of iron is 

1. 1

2. 2

3. 3

4. 0

What is the oxidation number of Co in $\left[Co{\left(N{H}_3\right)}_{4}ClN{O}_2\right]$

(1) + 2

(2) + 3

(3) + 4

(4) + 5