Question 6 :
Nitrogen form $N_2$, but phosphorous form $P_2$, it'sat a time convert in $P_4$, reason is : -

Question 7 :
Maximum number of covalent bonds formed by N and P respectively are :

Question 10 :
Which of the following pairs is obtained on heating ammonium dichromate?

Question 11 :
Assertion: A mixture of nitrogen and carbon dioxide can be distinguished by passing it through lime water. Reason: Nitrogen does not turn lime water milky.

Question 12 :
Assertion: The bond enthalpy of nitrogen is very high which makes it a highly stable diatomic molecule. Reason: The single $N-N$ bond formed is weaker than single $P-P$ bond.

Question 13 :
Among VA group elements, the element which has highest ionization energy?<br/>

Question 14 :
Assertion: Nitrogen turns moist red litmus paper blue. Reason: Ammonia is a basic gas.

Question 17 :
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 19 :
Which of the following elements can be involved in p$\pi-d\pi$ bonding?

Question 22 :
Trimethyl phosphine oxide can be represented by two canonical forms as shown but trimethylamine oxide can't be. It is due to:<br/>

Question 27 :
Assertion: Nitrogen reacts with hydrogen to form ammonium hydroxide. Reason: Reaction of nitrogen with hydrogen is endothermic.

Question 29 :
Assertion: Assertion: $N_2$ is less reactive than $P_4$ Reason: Reason: Nitrogen has more electron gain enthalpy than phosphorus.

Question 30 :
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 31 :
Of the following hydrides which one has the lowest boiling point?

Question 32 :
Assertion: Catenation tendency is weaker in nitrogen. Reason: Nitrogen exits as diatomic gas.

Question 34 :
The element which forms oxides in all oxidation states + 1 to + 5 is:

Question 36 :
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.

Question 39 :
The reactivity of the following compounds toward water is in the order:

Question 41 :
Assertion: Nitrogen is unreactive at room temperature but becomes reactive at elevated temperatures or in presence of a catalyst. Reason: In nitrogen molecule, there is extensive delocalization of electrons.

Question 43 :
The boiling point of the following hydrides follow the order of