In acidic medium, H$_2O_2$ changes Cr$_2O_7^{2-}$ to CrO$_5$ which has two (-O-O-) bonds. The oxidation state of Cr in CrO$_5$ is

The reaction of aqueous KMnO$_4$ with H$_2O_2$ in acidic conditions gives

Which one of the following is not a common component of photochemical smog?

Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?

Which of the following processes does not involve oxidation of iron?

Among the following, the correct order of acidity is

Which one of the following statements is correct when $SO_2$ is passed through acidified $K_2Cr_2O_7 \text { solution? }$

When copper is heated with conc.$HNO_3$ it produces

Name the gas that can readily decolorize acidified KMnO$_4$ solution.

In which pair of ions both the species contain S–S bond?

Extraction of gold and silver involves leaching with CN$^-$ ion. Silver is later recovered by

The correct order of N-compounds in its decreasing order of oxidation states is

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below:$\newline BrO_4^{-} \xrightarrow{1.82V} BrO_4^{-} \xrightarrow{1.5V} HBrO \xrightarrow{1.595V}Br_2\xrightarrow{1.0652V} Br^- \\$Then the species undergoing disproportionation is

For the redox reaction:$\\$MnO$_4^- +$C$_2$O$_4^{2-} +$H$^+ \rightarrow$Mn$^{2+} +$CO$_2 +$H$_2$O$, \\$the correct coefficients of the reactants $MnO_4^-, C_2O_4^{2-}, H^+$ for the balanced equation are

Which of the following reactions are disproportionation reactions?

Which one is malachite from the following?

Identify the correct statement from the following:

Urea reacts with water to form A which will decompose to form B. B when passed through Cu$^{2+}$(aq), deep blue colour solution C is formed. What is the formula of C from the following?

What is the change in oxidation number of carbon in the following reaction?$\\$CH$_4(g) + 4$Cl$_2(g) \rightarrow$CCl$_4(l) + 4$HCl$(g)$

Which of the following oxoacid of sulphur has a $-O-O-$ linkage?

Which of the following reactions is the metal displacement reaction? Choose the right option.

In the neutral or faintly alkaline medium, KMnO$_4$ oxidizes iodide into iodate. The change in oxidation state of manganese in this reaction is from:

The pollution due to oxides of sulphur gets enhanced due to the presence of:$\\ (a)$Particulate matter$\\ (b)$Ozone$\\ (c)$Hydrocarbons$\\ (d)$Hydrogen peroxide$. \\$Choose the most appropriate answer from the options given below:

Which of the following statements are NOT correct? A. Hydrogen is used to reduce heavy metal oxides to metals. B. Heavy water is used to study reaction mechanism. C. Hydrogen is used to make saturated fats from oils. D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element. E. Hydrogen reduces oxides of metals that are more active than iron. Choose the most appropriate answer from the options given below.

Match List-I with List-II:

The reaction that does NOT take place in a blast furnace between 900 K to 1500 K temperature range during extraction of iron is:

On balancing the given redox reaction,$\newline a Cr_2O_7^{2-} + b SO_3^{2-} (aq) + c H^+ (aq) \rightarrow 2a Cr^{3+} (aq) + b SO_4^{2-} (aq) + \frac{c}{2} H_2O (\ell) \newline$ the coefficients are: