Imagine Paper вЂ“ 2009
Class вЂ“ XII
Subject вЂ“ CHEMISTRY
p-BLOCK ELEMENTS (GROUP-15 REASONING)
Q1 Give reasons:
i) Nitrogen exists as diatomic molecules whereas phosphorous exist since tetra atomic molecules. ii) Molecular nitrogen is not particularly reactive.
iii) NCl3 gets easily hydrolyzed although NF3 does not.
iv) Nitrogen does not form pent halides like phosphorous. v) Bond angle of ammonia is definitely higher than phosphine.
vi) Freezing mixture is a good complexing agent.
vii) Though nitrogen exhibits +5 oxidation state, it does not kind pentahalide. Offer reason. viii) PH3 offers lower cooking food point than ammonia.
ix) H3PO3 is diprotic.
x) Unlike phosphorous, nitrogen shows little tendency for catenation. xi) Nitric acid cannot be used to put together H2S
xii) Phosphine is definitely prepared in inert ambiance of co2. xiii) Phosphorous pentaoxide is used in the planning of N2O5. xiv) Reddish phosphorous is employed for making matches.
xv) The electro negativity of both nitrogen and chlorine is the same. But nitrogen is inert at room temperature whereas chlorine is highly reactive. xvi) Pure PH3 does not burn but impure sample of PH3 melts away in surroundings xvii) Nitric acid converts yellow in sunlight.
xviii) Nitrate and nitrite can not be distinguished by the action of concentrated H2SO4. xix) NO2 cannot be dried up by means of NaOH solution.
xx) In heating Pb(NO3)2 produces a light yellow gas which in strong heat produces a brownish gas. xxi) Nitric acid solution mostly forms oxides of nitrogen on reacting with metals when other acids react with metals to evolve hydrogen. xxii) Burning magnesium continues to burn in nitric o2 while losing Sulphur extinguishes. xxiii) Phosphorous does not form phosphorous penta-iodide.
xxiv) Phosphorous acid is actually a dibasic acid.
xxv) (SiH3)3N is a weakened base than (CH3)3N.
xxvi) Mg3N2 once reacted with water emits NH3 although HCl is definitely not from MgCl2 upon reaction with...