Question 1 :
Which of the following reaction requires oxygen to be a reactant ?

Question 3 :
When chlorine reacts with sodium bromide the solution turns brown because ________.

Question 6 :
An oxidizing agent is always takes part in the reduction process while a reducing agent is always take part in the _______ process.

Question 8 :
In $HS^, I^, R-NH_2, NH_3$ order of proton excepting tendency will be:

Question 9 :
Which of the following symbol is used to show solid precipitate?

Question 10 :
The reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is neutralization reaction. State whether the statement is true or false

Question 11 :
Write the type of reaction.<br/>Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.<br/>

Question 13 :
The standard reduction potentials at $25^{\circ}C$ for the following half reactions are given against each;<br>$Zn^{2+}(aq.) + 2e^{-}\rightleftharpoons Zn(s); -0.762$<br>$Cr^{3+}(aq.) + 3e^{-}\rightleftharpoons Cr(s); -0.740$<br>$2H^{+} + 2e^{-}\rightleftharpoons H_{2}(g); 0.00$<br>$Fe^{3+} + e^{-}\rightleftharpoons Fe^{2+}; 0.77$<br>Which is the strongest reducing agent?

Question 14 :
Which of the following reaction are disproportion reaction?<br/>a) $2Cu^+\rightarrow Cu^{2+}+Cu^o$<br/>b) $3MnO^{2-}_4+4H^+\rightarrow 2MnO_4^-+MnO_2+2H_2O$<br/>c) $2KMnO_4\xrightarrow []{\Delta}K_2MnO_4+MnO_2+O_2$<br/>d) $2MnO_4^-+3Mn^{2+}+2H_2O\rightarrow 5MnO_2+4H^{+}$

Question 16 :
Assertion: In a reaction<br/><br/>$Z n ( s ) + CuSO_4 (aq) \rightarrow ZnSO_4 (aq) + Cu(s)$<br/><br/>Zn is a reductant but itself get oxidized. Reason: In a redox reaction, oxidant is reduced by accepting electrons and reductant is oxidized by losing electrons.

Question 18 :
In the context of redox reactions, the gain of hydrogen from a substance is known as:

Question 20 :
When $Fe$ replaces $CuSO_4$ in the following reaction, what will be the ionic compound that forms between Fe and $CuSO_4$?

Question 22 :
The reaction between carbon and oxygen can be represented as $C_{(s)}+O_{2(g)}\rightarrow CO_{2(g)}+heat$.<br/><br/>In which of the following type(s), the above reaction can be classified?<br/>I. Combustion reaction<br/>II. Displacement reaction<br/>III. Endothermic reaction<br/>IV. Combination reaction.<br/>

Question 24 :
Identify the reaction from the following in which physical and chemical changes are occurring:

Question 25 :
Which of the following are combination reactions?<br>(i)$2 \mathrm{KClO}_{3} \frac{\mathrm{Heat}}{\longrightarrow} 2 \mathrm{KCl}+3 \mathrm{O}_{2}$<br>(ii)$M g O+H_{2} o \rightarrow M g(O H)_{2}$<br>(iii)$4 A 1+3 O_{2} \rightarrow 2 A 1_{2} O_{3}$<br>(iv)$Z n+F e S O_{4} \rightarrow Z n S O_{4}+F e$

Question 27 :
In a change hydrogen peroxide gives rise' to hydrogen oxide and oxygen. This is an example of:

Question 28 :
When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen as given below:$2Pb(NO_3)_2\rightarrow 2PbO+4NO_2+O_2$<br/>The above reaction is an example of :

Question 29 :
When lead ($Pb$) is reacted with&#160;the hydrochloric acid a gas is evolved. Name the gas.<br/>

Question 30 :
Magnesium reacts with acids producing hydrogen and corresponding magnesium salts. In such reactions Mg undergoes.

Question 33 :
Many grain products, including cereals and others that identify themselves as a 'source of iron'. List something called &#34;reduced iron&#34; among the ingredients.<br/>To which of the following would the term &#34;reduced iron&#34; most likely be referring?

Question 34 :
Formation of nitric oxide from nitrogen and oxygen is a ______ reaction.

Question 36 :
A quantity of $12\ g$ of magnesium is burnt completely in air $(O_{2}=20\%$ and $N_{2}=80\%$ by volume). Which of the following is/are correct statement(s) regarding this combustion?

Question 37 :
Minimum amount of $Ag_2CO_3$ (s) required to produce sufficient amount of oxygen for the complete &#160;combustion of $C_2H_2$ which produces 11.2 L of $CO_2$ at STP after combustion is_________.<br/>$Ag_2CO_3 (s) \, \rightarrow\, 2Ag (s)\, +\, CO_2 (g)\, +\, \dfrac12 O_2 (g)$<br/>$C_2H_2\, +\, \dfrac52 O_2\, \rightarrow\, 2CO_2\, +\, H_2O$<br/>

Question 39 :
The equation which is balanced and represents the correct product is:

Question 40 :
A metal ($A$) on heating in nitrogen gas gives compound $B$. $B$ on treatment with ${H}_{2}O$ gives a colourless gas which when passed through $Cu{SO}_{4}$ solution gives a dark blue-violet coloured solution. $A$ and $B$ respectively, are :