Types of Chemical Reactions

For welding a mixture of oxygen and_____ is burnt.

When lead nitrate is heated a brown gas is evolved, the evolved gas is

Which fuel has the highest calorific value?

Choose the correct statements about the given chemical reaction.

$3\mathrm{Fe}\left(\mathrm{s}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \to {\mathrm{Fe}}_3{\mathrm{O}}_4\left(\mathrm{s}\right)+4{\mathrm{H}}_2\left(\mathrm{g}\right)$

a. Iron is getting oxidised.

b. Water is getting reduced.

c. Water is acting as a reducing agent.

d. Water is acting as an oxidising agent

An example (s) for endothermic process (es) is (are)

a. Dilution of sulphuric acid

b. Sublimation of dry ice

c. Condensation of water vapours

d. Evaporation of water

${\mathrm{Fe}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Fe}$

The type of the above reaction is:

The metal oxide which decomposes on heating

Which of the following arrangements represent the increasing oxidation number of the central atom $(\mathrm{Mn}, \mathrm{Cr}, \mathrm{Cl})$?

Which one is addition reaction?

The oxidation reaction in the following chemical changes is 

Match the items of the column -I with column-II and choose the correct option.

A substance that oxidises itself and reduces other is-

$\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{AgNO}}_3\left(\mathrm{aq}\right)\to \mathrm{AgCl}\downarrow +{\mathrm{NaNO}}_3\left(\mathrm{aq}\right)$

The above reaction is a-

In which reaction the addition and removal of oxygen take place simultaneously?

Which of the following are combination reaction?

(i) $2{\mathrm{KClO}}_3\stackrel{∆}{\to }2\mathrm{KCl}+3{\mathrm{O}}_2$

(ii) $\mathrm{MgO}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

(iii) $4\mathrm{Al}+3{\mathrm{O}}_2\to 2{\mathrm{Al}}_2{\mathrm{O}}_3$

(iv) $\mathrm{Zn} + {\mathrm{FeSO}}_4\to {\mathrm{ZnSO}}_4 + \mathrm{Fe}$

In the reaction $3{\mathrm{MnO}}_2+4\mathrm{Al} \stackrel{}{\to } 3\mathrm{Mn}+2{\mathrm{Al}}_2{\mathrm{O}}_3$ the oxidising agent is:

In the equation $\mathrm{CuO}+{\mathrm{H}}_2\to \mathrm{Cu}+{\mathrm{H}}_2\mathrm{O}$, the substance reduced is 

What happens when dilute hydrochloric acid is added to iron filings?

Excess of $\mathrm{KI}$ reacts with ${\mathrm{CuSO}}_4$ solution and then ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ solution is added to it. Which of the following statements is incorrect? 

Which of the following reaction is not a redox reaction ?