Question 3 :
Name the reducing agent in the following:<br>$3MnO_{2} + 4Al \rightarrow 3Mn + 2Al_{2}O_{3}$
Question 4 :
Three cations $A, B, C$ are allowed to react with ammonium hydroxide solution. $A$ and $B$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of ${NH}_{4}OH$. $C$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of ${NH}_{4}OH$, precipitate becomes soluble and deep blue colour solution is formed:
Question 6 :
How many moles of electrons are involved in the reduction of one mole of $MnO^-_4$ ion in alkaline medium to $MnO^-_3$?
Question 7 :
Which of the following chemical species will be same in the given procedure ?
Question 8 :
In which of the following reactions, does a non-metal act as a reducing agent?
Question 9 :
When Carbon monoxide is passed over heated copper oxide it gives :<br/>
Question 11 :
<span><span><span><span><span><span><span><span><span>Rusting of iron in the presence of moist oxygen is an oxidation reaction.<br/></span></span></span></span></span></span></span></span></span>
Question 12 :
Out of the halogens, which one is the most powerful oxidizing agent?
Question 15 :
Which of the following acts both as oxidising as well as reducing agent?
Question 16 :
Iron is extracted from iron oxide using carbon monoxide as shown.<br>iron oxide + carbon monoxide $\rightarrow$ iron + carbon dioxide<br>Which statement is correct?
Question 19 :
In the given reaction,<br>$2{ K }_{ 4 }\left[ Fe{ \left( CN \right) }_{ 6 } \right] \left( aq \right) +{ H }_{ 2 }{ O }_{ 2 }\left( aq \right) \longrightarrow \\ 2{ K }_{ 3 }\left[ Fe{ \left( CN \right) }_{ 6 } \right] \left( aq \right) +{ 2KOH }\left( aq \right) $<br>Which of the following processes takes place?
Question 23 :
In the process of burning of magnesium in air, magnesium undergoes :
Question 24 :
$HOCl(aq)$ is the molecule that kills bacteria wen chlorine is added to water. <br>The following reaction produces this molecule<br>${Cl}_{2}(g)+{H}_{2}O(l)\rightleftharpoons HOCl(aq)+{H}^{+}(aq)+{Cl}^{-}(aq)$<br>Which statement about this reaction is correct?
Question 26 : Which statement is correct about the following reaction ? <div>ZnO + CO $\rightarrow$ Zn + CO$_2$</div>
Question 28 :
Assertion: Oxidation is the gain of oxygen.
Reason: Reduction is the loss of oxygen.
Question 30 :
The species reduce in the following reaction is :<br/>$Fe_2O_3+3CO \rightarrow2 Fe+3CO_2$
Question 32 :
In acid medium, the standard reduction potential of $NO$ converted to ${ N }_{ 2 }O$ is $1.59 V$. Its standard potential in alkaline medium would be:
Question 33 :
For the reaction $PbO+H_2\rightarrow Pb+H_{2}O$, which of the following statements is wrong?
Question 36 : <div><span>Write the type of reaction.</span><br/></div>Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.<br/>
Question 37 :
In the reaction $2Ag\, +\, 2H_2SO_4\, \rightarrow\, Ag_2SO_4 \,+\, 2H_2O\, +\, SO_2$, sulphuric acid acts as :
Question 38 : $CuO(s) + H_2(g) \rightarrow Cu(s) + H_2O(l)$ <div>In this reaction, _______ is reduced. </div>
Question 39 :
Change of orange color of chromium(VI) to green color of chromium(III) <span>indicates presence of a:</span>
Question 40 :
Thiosulphate reacts differently with iodine and bromine in the reaction given below.<br>$2S_2O_3^{2-}+I_2 \rightarrow S_4O_6^{2-}+2I^-$<br>$S_2O_3^{2-}+2Br_2+5H_2O \rightarrow 2SO_4^{2-}+2Br^-+10H^+$<br>Which of the following statement justifies the above dual behaviour of thiosulphate?
Question 41 :
Change of orange color of chromium(VI) to green color of chromium(III) <span>indicates presence of a:</span>
Question 42 :
Which one of the following undergoes reduction with $H_2O_2$ in an alkaline medium?
Question 47 :
During the oxidation of arsenite ion, $AsO_{3}^{3-}$, to arsenate ion, $AsO_{4}^{3-}$, in alkaline medium, the number of moles of hydroxide ions consumed per mole of arsenite ion is
Question 48 :
Iodine is formed when KI reacts with a solution of <br>
Question 49 :
Which of the following is a non - redox process ?
Question 50 :
Dichloroacetic acid $ (CHCl_{2}CO_{2}H) $ is oxidized to $ CO_{2}, H_{2}O $ and $ Cl_{2} $ by 1.2 equivalents of an oxidizing agent. Same amount of the acid can neutralize 'X' moles of $ NH_{2} $ to give ammonium dichloroacetate. $ 'X' $ is
