Question 1 :
The efficiency of an enzyme to catalyse a reaction is due to its capacity to:

Question 2 :
The temperature at which the enzyme shows maximum activity is known as _____________ temperature.<br/>

Question 3 :
Which of the following is the best way to speed up a chemical reaction?<br/>

Question 4 :
The structural resemblence of substrate and inhibitor leads to ______________ inhibition.

Question 8 :
Chlorophyll, the green colouring matter in plants helps the process of photosynthesis by:

Question 14 :
Statement: Zeolites are water softner as well as catalyst.<div><br/>Explanation: The catalytic action of zeolites is based upon their shape selectivity.<br/></div>

Question 16 :
Match the Column-I with Column-II. Choose the correct' one from the alternatives (a), (b) , (c) and (d). <div><br/><table class="wysiwyg-table"><tbody><tr><td>Column - I</td><td>Column-II</td></tr><tr><td>P. Wilkinson catalyst</td><td> I. trans -$IrCl(CO)(PPh_3)_2$</td></tr><tr><td>Q. Speier catalyst</td><td>II. Hydrosilylation </td></tr><tr><td>R. Water gas shift catalyst</td><td> III. $RhCl (PPh_3)_3$</td></tr><tr><td>S. Zeolite ZSM-5 catalyst </td><td> IV. Synthetic gasoline</td></tr><tr><td></td><td>V. Hydroformylation</td></tr><tr><td></td><td> VI. Zinc-copper oxide</td></tr></tbody></table></div>

Question 18 :
Assertion: ZSM -5 is used as a catalyst in petrochemical industries. Reason: Zeolites are three-dimensional network silicates in which some silicon atoms are replaced by aluminium atoms.

Question 19 :
Consider the following reactions at 300 K: X $\rightarrow$ Y (uncatalysed reaction) &amp; X $\rightarrow$ Y (catalysed reaction). The energy of activation is lowered by 83.14 kJmol$^{-1}$ for the catalysed reaction. <div>The rate of catalysed reaction is:<br/></div>

Question 21 :
For a given reaction, energy of activation for forward reaction $(E_{af})$ is $80kJ.mol^{-1}.$ $\Delta H = -40kJ.mol^{-1}$ for the reaction. A catalyst lowers $E_{af}$ to $20 kJ.mol^{-1}.$ The ratio of energy of activation for reverse reaction before and after addition of catalyst is :<br/>

Question 22 :
Assertion: Alcohols are dehydrated to hydrocarbons in the presence of acidic zeolites. Reason: Zeolites are microporous catalysts.

Question 23 :
For the reaction, {tex} \mathrm { CO } ( \mathrm { g } ) + \mathrm { Cl } _ { 2 } ( \mathrm { g } ) \rightleftharpoons \mathrm { COCl } _ { 2 } ( \mathrm { g } ) {/tex} the {tex} K _ { p } / K _ { c } {/tex} is equal to

Question 24 :
In which of the following reactions, increase in the volume at constant temperature does not affect the number of moles at equilibrium?

Question 25 :
Pure {tex} \mathrm { NH } _ { 3 } {/tex} is placed in a vessel at a temperature where its dissociation is appreciable. At equilibrium

Question 26 :
Consider the reaction equilibrium<br> {tex} 2 \mathrm { SO } _ { 2 } ( \mathrm { g } ) + \mathrm { O } _ { 2 } ( \mathrm { g } ) \rightleftharpoons 2 \mathrm { SO } _ { 3 } ( \mathrm { g } ) ; \Delta \mathrm { H } ^ { \circ } = - 198 \mathrm { kJ } {/tex}<br>On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is<br>

Question 27 :
The first and second dissociation constants of an acid {tex} \mathrm { H } _ { 2 } \mathrm { A } {/tex} are {tex} 1.0 \times 10 ^ { - 5 } {/tex} and {tex} 5.0 \times 10 ^ { - 10 } {/tex} respectively. The overall dissociation constant of the acid will be

Question 28 :
Let the solubility of an aqueous solution of {tex} \mathrm { Mg } ( \mathrm { OH } ) _ { 2 } {/tex} be {tex} x {/tex} then its {tex} K _ { s p } {/tex} is

Question 29 :
Conjugate acid of {tex} \mathrm { PO } _ { 4 } ^ { - 3 } {/tex} is

Question 30 :
What is the equilibrium expression for the reaction<br> {tex} \mathrm { P } _ { 4 } ( s ) + 5 \mathrm { O } _ { 2 } ( \mathrm { g } ) \rightleftharpoons \mathrm { P } _ { 4 } \mathrm { O } _ { 10 } ( \mathrm { s } ) ? {/tex}

Question 31 :
For the reaction {tex} \mathrm { SO } _ { 2 ( g ) } + \frac { 1 } { 2 } \mathrm { O } _ { 2 ( g ) } \rightleftharpoons \mathrm { SO } _ { 3 ( g ) } , {/tex} if {tex} K _ { P } = K _ { C } ( R T ) ^ { x } {/tex} where the symbols have usual meaning then the value of {tex} x {/tex} is (assuming ideality):

Question 32 :
For the reaction, {tex} \mathrm { CO } _ { ( \mathrm { g } ) } + \mathrm { Cl } _ { 2 \mathrm { g } } \Rightarrow \mathrm { COCl } _ { 2 \mathrm { g } } , {/tex} the {tex} K _ { p } / K _ { \mathrm { c } } {/tex} is equal to

Question 33 :
For the reaction equilibrium {tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 4 } ( \mathrm { g } ) \rightleftharpoons 2 \mathrm { NO } _ { 2 } ( \mathrm { g } ) {/tex}<br>the concentrations of {tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 4 } {/tex} and {tex} \mathrm { NO } _ { 2 } {/tex} at equilibrium are {tex} 4.8 \times 10 ^ { - 2 } {/tex} and {tex} 1.2 \times 10 ^ { - 2 } \mathrm { mol } \mathrm { L } ^ { - 1 } {/tex} respectively. The value of {tex} K _ { \mathrm { c } } {/tex} for the reaction is<br>

Question 34 :
The conjugate base of {tex} \mathrm { H } _ { 2 } \mathrm { PO } _ { 4 } ^ { - } {/tex} is

Question 35 :
{tex} \mathrm { 1M\ NaCl } {/tex} and {tex} \mathrm { 1M\ HCl } {/tex} are present in an aqueous solution. The solution is

Question 36 :
{tex} \mathrm { C } ( \mathrm { s } ) + \mathrm { H } _ { 2 } \mathrm { O } ( \mathrm { g } ) \rightleftharpoons \mathrm { H } _ { 2 } ( \mathrm { g } ) + \mathrm { CO } ( \mathrm { g } ) {/tex}<br>What will be the effect of pressure on the above equilibrium process?<br>

Question 37 :
<font>A solution prepared by dissolving 2.8 g of lime (CaO) in enough water to make 1.00 L of lime water (Ca(OH)2(aq.)). If solubility of Ca(OH)2 in water is 1.48 gm/lt. The pH of the solution obtained will be: </font> </p> <p align="justify"> <font>[log 2 = 0.3, Ca = 40 , O = 16, H = 1]</font></p>

Question 38 :
<font> K</font>_{<font>sp</font>}<font> of SrF</font>_{<font>2</font>}<font> (s) in water is 3.2 × 10</font>^{<font>-11</font>}<font>. The solubility of SrF</font>_{<font>2</font>}<font> (s) in 0.1 (M) NaCl solution is -</font></p>

Question 39 :
Find the percentage of hydrolysis in 0.003 M aqueous solution of NaOCN. Given K_a for HOCN = 3.33 &times; 10^&ndash;4 and K_w = 1 &times; 10^&ndash;14.

Question 40 :
<font> 10</font>^{<font>-6</font>}<font> M NaOH is diluted by 100 times. The pH of diluted base is -</font></p>

Question 41 :
<font>In a saturated solution of the sparingly soluble strong electrolyte AgIO3 (Molecular mass = 283) the equilibrium which sets in is</font></p> <p align="justify"> <font>AgIO3(s) </font> <img style='object-fit:contain' align="bottom" height="14" src="https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5fc0eb92e6377b2e815f4098" width="32"/> <font> Ag+(aq) + IO-3(aq)</font></p> <p align="justify"> <font>If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0 × 10-8, what is the mass of AgIO3 contained in 100 ml of its saturated solution?</font></p>