Question 1 :
Nitrogen form $N_2$, but phosphorous form $P_2$, it'sat a time convert in $P_4$, reason is : -

Question 2 :
Which of the following pairs is obtained on heating ammonium dichromate?

Question 6 :
The type of bond between the atoms in a nitrogen molecule is :

Question 7 :
Which of the following is an example of super octet molecule?

Question 9 :
Which one of the following elements does not form the compound, M$_{4}$ O$_{10}$ (M = element)?<br/><br/>

Question 12 :
Phosphorus undergoes slow combustion and glows in dark. The process is called:

Question 13 :
Assertion: $NO_2$ and $CO_2$ both odd electron molecules and hence dimerizes.Reason :- On dimerisation, $ NO_{2} $ is converted to stable $ N_{2}O_{4} $ molecule with even number of electrons.&#160;<br/>

Question 14 :
The element which forms oxides in all oxidation states + 1 to + 5 is:

Question 15 :
Assertion: $N_2H_4$ is a weaker base than $NH_3$ Reason: Its behaviour is bifunctional

Question 17 :
$N{ F }_{ 3 }$ is stable, but $N{ Cl }_{ 3 }$ is explosive. Identify the reason.

Question 21 :
Trimethyl phosphine oxide can be represented by two canonical forms as shown but trimethylamine oxide can't be. It is due to:<br/>

Question 24 :
Nitrogen has unique ability to form&#160;$\displaystyle P\pi -P\pi&#160;$ multiple bonds with itself and with other elements due to:

Question 25 :
Aqueous solution of hydrogen sulphide and sulphur dioxide when mixed together,yield

Question 26 :
Assertion: Nitrogen turns moist red litmus paper blue. Reason: Ammonia is a basic gas.

Question 27 :
Match the List-I with List-II and select the correct answer from the given Codes.<table class="wysiwyg-table"><tbody><tr><td>List-I</td><td>List-II</td></tr><tr><td>(Compound)</td><td>(Oxidation state of nitrogen)</td></tr><tr><td>$N_2O_5$</td><td>$-2$</td></tr><tr><td>$NaN_3$</td><td>$+5$</td></tr><tr><td>NO</td><td>$-1/3$</td></tr><tr><td>$N_2H_4$</td><td>$+2$</td></tr></tbody></table>

Question 29 :
Which one of the following acid possesses oxidising, reducing and complex forming properties?

Question 30 :
In Nitrogen family the H-M-H angle in the hydrides&#160;$MH_{3}$&#160;gradually becomes closer to $90^0$&#160;on going&#160;from N to Sb. This shows that gradually&#160;:<br/>

Question 31 :
Nitrogen forms stable $N_{2}$ molecule but phosphorus is converted to $P_{4}$ from $P_{2}$because:

Question 32 :
The oxides of $15^{th}$ group elements of the type $M_{2}O_{3}$ which will exhibit amphoteric or basic properties but no acidic properties are__________.<br/>

Question 34 :
When bismuth chloride is poured into a large volume of water, the white precipitate formed is:

Question 35 :
The reactivity of the following compounds toward water is in the order:

Question 39 :
The boiling point of the following hydrides follow the order of

Question 41 :
In case of nitrogen, $ NCl_3$ is possible but not $NCl_5$ whereas in case of phosphorus&#160;$PCl_3$ as well as $PCl_5$ are possible. It is due to:

Question 49 :
Which of these ions need to be stored in fairly acidic media?

Question 50 :
Nitrogen and phosphorus are both in Group 15 of the Periodic Table. Phosphorus forms a chloride with the formula $P{Cl}_{5}$ but nitrogen does not form $N{Cl}_{5}$.<br>Which statements help to explain this?<br>1. Nitrogen's outer shell cannot contain more than eight electrons.<br>2. Nitrogen cannot have an oxidation state of $+5$<br>3. Nitrogen is less electronegative than phosphorus.