Pure anhydrous magnesium chloride can be prepared from hydrated salt by

1)  They exist in equilibrium

2)  They possess same electronic arrangement but different atomic arrangements

3)  They possess same molecular mass

4)  They have different electronic as well as atomic arrangements

Which one of the following sets of ions represent the collection of isoelectronic species? 

1) K⁺,Ca²⁺,Sc³⁺,Cl⁻
2) Na⁺,Mg²⁺,Al³⁺,Cl⁻
3) K⁺,Cl⁻,Mg²⁺,Sc³⁺
4) Na⁺,Ca²⁺,Sc³⁺,F⁻

Aliphatic amide on treatment with HNO₂ gives the gas

1) CO₂
2) N₂
3) O₂
4) H₂

In the reaction with HCl, an alkene reacts in accordance with the markownikoff's rule, to give a product 1-chloro -1- methylcyclohexane. The possible alkane is 

Glycerol is purified by

1) Steam distillation

2) Sublimation

3) Simple distillation

4) Vacuum distillation

Sodium phenoxide reacts with CO₂ at 400K and 4−7 atm pressure to give:

1) Cathchol
2) Salicylaldehyde
3) Salocylic acid
4) Sodium salicylate

CsBr crystallizes in a body-centred cubic lattice of unit cell edge length 436.6 pm. Atomic masses of Cs and Br are 133 amu and 80 amu respectively. The density (in g cm⁻³) of CsBr is

1) 8.50
2) 4.25
3) 42.5
4) 0.425

According to MO theory which of the list ranks the oxygen species in terms of increasing bond order 

$$O_2^{2 - },\,O_2^ + ,O_2^ - \,,\,O_2^{2 - }$$
1) $$O_2^{2 - },\,O_2^ - ,O_2^ + \,,\,{O_2}$$
2) $$O_2^ + ,\,{O_2},O_2^ - \,,\,O_2^{2 - }$$
3) $${O_2},\,{O_2},O_2^ + \,,\,O_2^{2 - }$$
4) $$O_2^{2 - },\,O_2^ - ,{O_2}\,,\,O_2^ + $$

How many stereoisomers are therefor tartaric acid?

1) 2
2) 3
3) 4
4) 5

Which of the following compounds will not undergo Friedel -Craft's reaction easily?

1) Cumene
2) Xylene
3) Nitrobenzene
4) Toluene