Nitrogen

Q.

The Alkali metals dissolve in liquid $N{H}_3$. It is observed that

1. The blue colour is due to solvated electrons

2. The dilute solutions are blue and the colour changes to bronze with increasing concentration.

3. The blue solutions are paramagnetic & reducing agents

4. All the above facts are correct

Q. 5. In group 15 elements why basicity of hydrides decreases down the group?

Q. Energy required to dissociate 4g of gaseous hydrogen into free gaseous atoms is 208 Kcal at ${25}^{o}C$. The bond energy of H - H bond will be:

1. 1040 Kcal

2. 1.04 Kcal

3. 10.4 Kcal

4. 104 Kcal

Q. 1. Pair of species with the same bond order is 1)NO, CO 2)N2, O2 3)O2-, B2 4)O2+, NO+

Q.

A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of $N_2:O_2$ is 3 : 1. Find the partial pressure of nitrogen in the sample.

1. 480 mm

2. 600 mm

3. 450 mm

4. 160 mm

Q. 1 What is the hybridisation of nitrogen in pyrrole, pyridine, pepridini, pyrimidine.

Q. C2h6+o2 gives co2+h2o Total number of o2 molecules used during complete combustion of 1 mole of c2h6(g) is ?

Q. In Birkeland-Eyde process, the raw material used is

1. Air

2. NH₃

3. NO₂

4. HNO₃

Q. which of the following substrates is an electron donating group overall? Br, Coch3, och3, N(+)(CH3), ccl3

Q. Why CO2 can not bent or angular shape and this compound similar to H2O and we know that H2O is bent shape, So why we can not say that Co2 is also angular shape

Q.

Nitrogen is obtained by the thermal decomposition of:

1. Ammonium nitrate

2. Ammonium nitrite

3. Silver (I) nitrate

4. Lead (II) nitrate

Q. In the Kjeldahls method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4The percentage of nitrogen in the soil is

Q. If there are intramolecular H bonding in a compound then would there be intermolecular H bonding present between two of those compounds( Is it possible to have intra and intermolecular H bonding present in the same compound) for eg. in O nitrophenol will it have intermolecular H bonding prestn along with Intramolecular H bonding

Q. 35. explain how to make bond angle of different molecules like NO2 NO2- ClO2 ClO2- OCl2 and so on.And arrange them in decreasing order of bond angle. Briefly

Q. Sulphur dioxide is SO_2. Ifoxygen atom forms two covalent bonds, how many bonds does sulphur form in sulphur dioxide.

Q. when a certain amount of ethylene (c2h4)was combusted, 6226 kJ heat was evolved.If the heat of the combustion of ethylene is 1411kJ/mol, the volume of oxygen that entered into the reaction at STP is nearly

Q. 37. If C.C bond energy is 348 kJmol-1 , C.H bond energy us 412 KJ mol-1 and H-H bond energy is 436 KJ mol-1, the Pauling electro negativity of C is about(Given electro negativity of H=2.1)

Q.

why bond angle in NH₃ and H₂O is larger than bond angle in H₂S

Q. what is lone-pair and what is bond pair?

Q. Which of the following statements is correct ? (1) All the three N–O bond lengths in HNO3 are equal (2) All P–Cl bond lengths in PCl5 molecule in gaseous state are equal (3) P4 molecule in white phosphorus have angular strain therefore white phosphorus is very reactive (4) PBr5 is ionic in solid state in which cation is tetrahedral and anion is octahedra (acc. to me both 3&4 are correct , is it so?)

Q. is it important in a reaction to show whether electrophilic part attacks nucleophilic part or nucleophilic part attacks electrophilic part?
if it is important, which part attacks what?

Q. Ammonium dichromate is used in fire works. The green coloured powder obtained is:

1. $Cr{O}_3$
2. $C{r}_2{O}_3$
3. $Cr$
4. $CrO\left(O_2\right)$

Q. 39. Bond order in compound PO_4-3 is

Q.

The correct statement about the compounds A, B and C are

1. A and B are identical

2. A and B are diastereomers

3. A and B enantiomers

4. A and C are enantiomers

Q. Extra pure $N_2$ can be obtained by heating:

1. $N{H}_3$ with $CuO$
2. $N{H}_{4}N{O}_3$
3. $(N{H}_4{)}_{2}C{r}_2{O}_7$
4. $Ba(N_3{)}_2$

Q. 50.What is the method to find out bond order in case of triatomic or polyatomic species such as carbon di oxide, boron trifluoride?

Q. Why hydrogen bond is weaker than covalent bond ?

Q. In $\left(N_2\right)$ gas, the $\pi -bond$ is weaker than $\sigma -bond$.

1. True
2. False

Q. What is the reaction between 1-Butyne and hot alkaline KMnO_4?

Q. 59. Which shows high bond energy? A)C=_C B)C=_N C)C=_O D)N=_N