Which of the following reactions does not represent a redox change?

If H₂S is passed through an acidified K₂Cr₂O₇ solution, the colour of the solution:

The oxidation number and covalency of sulphur in the sulphur molecule (S₈) are respectively:

H₂S is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

The most common oxidation state of an element is -2. The number of electrons present in its outermost shell is:

4P + 3KOH + 3H₂O $\to$ 3KH₂PO₂ + PH₃:

Correct statement regarding the above reaction is -

In which SO₂ acts as oxidant, while reacting with:

In the reaction;

3Br₂ + 6C${\mathrm{O}}_3^{2-}$ + 3H₂O $\to$5Br^- + Br${\mathrm{O}}_3^{-}$ + 6HC${\mathrm{O}}_3^{-}$

which statement is correct?

When NaCl is dissolved in water, the sodium ion becomes:

Hypochlorite disproportionate to give -

Which has highest normality?

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

Mg(OH)₂ + HCl $\to$Mg(OH)Cl + H₂O₂, the equivalent weight of Mg(OH)₂ will be (M= Mol. wt. of Mg(OH)₂)

A metallic oxide contains 20% oxygen. The equivalent weight of metal is

2 gm limestone (CaCO₃ + Impurities ) is reacted with 100ml N/2 HCl. The excess acid requires 60ml N/2 NaOH. The % purity of limestone is

1.575 gm crystalline oxalic acid $\underset{\mathrm{COOH}}{\overset{\mathrm{COOH}}{| }}·{\mathrm{xH}}_2\mathrm{O}$ is dissolved in water and diluted upto 250 ml. 25ml of this solution is completely neutralised with 250ml N/10 NaOH. The value of 'x' is 

A 2 gm mixture of K₂CO₃ and KCl is completely reacted with 100 ml N/10 HCl. The % of K₂CO₃ in the mixture is (K = 39, Cl =35.5, C=12, O=16)

400 ml M/10 H₂SO₄ is mixed with 600 ml N/10 NaOH then normality and nature of solution respectively will be

The oxidation number of sulphur in S₈, S₂F₂ and H₂S respectively are :

When Cl₂ is converted into Cl^- & Cl${\mathrm{O}}_3^{-}$ then n-factor of Cl₂ will be:

MnO₂ + 4HCl $\to$MnCl₂+2H₂O+Cl₂, the equivalent wt. of HCl will be (M$\equiv$Mol wt of HCl)

In Na₂S₂O₃, the oxidation number of S is

Which acts as a reducing agent only?

Mn${\mathrm{O}}_4^{-}$(aq) + 8H⁺(aq) + 5e^- $\to$Mn²⁺(aq) + 4H₂O(l);${\mathrm{E}}^{°}$=1051V

Cr₂O_7^2-(aq) +14H⁺(aq) + 6e _$\to$2Cr^₃₊(aq) ₊ 7H₂O(l)_{;${\mathrm{E}}^{°}$}=1.38V

Fe³⁺(aq) + e^- _$\to$Fe²⁺(aq);_{${\mathrm{E}}^{°}$}=0.77V

Cl₂(g) + 2e^- _$\to$2Cl^-(aq); _{${\mathrm{E}}^{°}$}= 1.40V

The incorrect statement regarding the quantitative estimation of aqueous  Fe(NO₃)_{2 is -}

The equivalent weight of H₃PO₂, when it disproportionates into PH₃ and H₃PO₃ is 

In the reaction, 2Cu⁺ $\to$Cu + Cu²⁺, the equivalent weight of Cu⁺ is (M is the mol. wt. of Cu⁺)

Equal volumes of 1M each of KMnO₄ and ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ are used to oxidize Fe(II) solution in acidic medium. The amount of Fe oxidized will be

Which of the following is Redox reaction?

In the reaction:

X HI + Y HNO₃ $\to$NO + I₂ + H₂O

The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. The atomic weight of the metal is:-