Question 2 :
In which of the following respective volume rains should 0.1 M NH,OH soiuton A 0.1 M HCI soiuton be<span>mixed,'so that the resulting solution behaves like a buffer solution ?</span>

Question 3 :
When $0.1\ mol$ arsenic acid, $H_{2}AsO_{4}$ is dissolved in $1L$ buffer solution of $pH = 4$, which of the following hold good? $K_{1} = 2.5\times 10^{-4}, K_{2} = 5\times 10^{4}, K_{3} = 2\times 10^{-23}$ for arsenic acid $['&lt; &lt;'$ sign denotes that the higher concentration is at least $100$ times more than the lower one].&nbsp;

Question 4 :
${K}_{a}$ for $HCN$ is $5\times {10}^{-10}$ at ${25}^{o}C$. For maintaining a constant $pH$ of $9$, the volume of $5M$ $KCN$ solution required to be added to $10mL$ of $2M$ $HCN$ solution is

Question 5 :
Which of the following pair of solutions does not form buffer solutions?<br/>

Question 10 :
Which of the following statement is correct in relation to the halogenation of alkane?

Question 11 :
Which of the following is the chain propagation step in chlorination of methane?<br/>

Question 12 :
$C_6H_6+C_2H_5Cl\quad \underrightarrow {AlCl_3}\quad Z$<div>What is the ratio between $\sigma $ and $\pi$ bonds in 'Z'?</div>

Question 13 :
$\left( { CH }_{ 3 } \right) _{ 3 }C-MgCl$ on reaction with ${ D }_{ 2 }O$ produces :

Question 14 :
Consider the nitration of benzene using mixed concentrated $H_2SO_4$ and $HNO_3$. If a large amount of $KHSO_4$ is added to the mixture, the rate of nitration will be :

Question 15 :
Which of these metal carbides on reaction with $H_2O$ form $CH_4$?

Question 16 :
A fuel has the same knocking property as a mixture of 70% iso-octane (2, 2, 4-trimethylpentane) and 30% n-heptane by volume. The octane number of the fuel is:

Question 18 :
The base unit for the length in metric system is :

Question 20 :
<span>Equal volume of gases contain equal number of moles.</span><div>State whether the above statement is true or false.</div>

Question 23 :
The weights of two elements which combines with one another are in the ratio of their:

Question 24 :
What will be the unit of time in that system in which unit of length is m, unit of mass is kg and unit of force is kg wt ?

Question 27 :
Which of the following enzymes are required for the fermentation of carbohydrates:

Question 29 :
Compounds which contain oxides of carbon or carbonate hydrogencarbonate ions are called:

Question 37 :
Which out of following hydrocarbons undergo addition reactions?<div><br/>$C_2H_6, C_3H_8, C_3H_6, C_2H_2$ and $CH_4$</div>

Question 39 :
Identity the correct sequence of increasing number of $\pi-$bonds in structure of the following molecules:<br/>I) $H_{2}S_{2}O_{6}$<br/>II) $H_{2}SO_{3}$<br/>III) $H_{2}S_{2}O_{5}$<br/>

Question 41 :
Bond angle between two hybrid orbitals is $105^{o}$, hybrid $s$-character in orbital is :