The p-Block Ele...

Calcium cyanamide on treatment with steam produces :

$$NH_4CI(s)$$ is heated in a test tube, vapours are brought in contact with red litmus paper, which changes to blue and then to red. it is because of : 

$$Fe^{2+}$$ reduces $$NH_2OH$$ to : 

For inert gases, $$\displaystyle \frac{C_p}{C_v}= $$ _____ .

The gas not absorbed by coconut charcoal is :

Hydrates of helium and neon have not been prepared because of :

Which of the following are coloured and paramagnetic both ?
$$NO_2, Cu^+, O_2, O_3, Hg^{2+}_2, Cd^{2+}, Al, C(graphite)$$ 

Consider the following properties of the noble gases:
$$I$$:      they readily from compounds which are colourless.
$$II$$ :   they generally do not form ionic compounds.
$$III$$ : they have variable oxidation states in their compounds.
$$IV$$ :  they generally do not form covalent compounds.

High reactivity of white phosphorus is due to : 

In $$P_4$$ (tetrahedral) :