MHT CET 2016 :: Chemistry :: General questions

• Chemistry - General questions

Isopropyl methyl ether when treated with cold hydrogen iodide  gives

Answer:

Explanation:

 Isopropyl  methyl ether when treated with cold hydrogen iodide gives isopropyl alcohol  and methyl iodide

 In case of asymmetrical ethers. The alkyl halide is always formed from the smaller alkyl group

The element that does not form acidic oxide is

Answer:

Explanation:

The acidic oxides are formed by the non-metals (group 14-17) whereas basic oxides are formed by the metals of group 1 and group 2 elements.

As the atoms get larger, the ionisation energy decreases and the elements also become more basic. BeO  is an amphoteric oxide, MgO is weakly basic while BaO  is a highly basic oxide 

Which metal crystallizes in a simple cubic structure?

Answer:

Explanation:

In a simple cubic structure, the spheres are not packed as closely as they could be, and they only fill about 52% of the volume of the container. This is a relatively inefficient arrangement and only one metal (polonium, Po) crystallises in a simple cubic structure. For a polonium atom in a simple cubic array, the coordination number is six.

 In the cell represented by $Pb(s)|Pb^{2+}(1M)||Ag^{+}(1M)|Ag(s).$ the reducing agent is

Answer:

Explanation:

In the cell represented by 

$Pb(s)|Pb^{2+}(1M)|| Ag^{+}(1M)|Ag(s)$  , the

reducing agent is Pb  because it readily gets oxidised to Pb²⁺ and helps in the reduction of $Ag ^{+}$  to Ag(s).

  $Pb(s)\rightarrow Pb^{2+}(1M)+2e^{-}$

$Ag^{+}+1e^{-}\rightarrow  Ag(s)$

The compound which is not formed when a mixture  of n-butyl  bromide  and ethyl bromide treated with sodium metal in the presence of dry ether is

Answer:

Explanation:

When a mixture of n-butyl bromide and ethyl bromide  is treated with sodium metal in the presence of dry ether, then ethane  cannot be formeds  because reaction follows

 Wurtz-Fitting reaction . it is a type of coupling reaction.

$CH_{3}CH_{2}CH_{2}CH_{2}Br+CH_{3}CH_{2}Br+2Na   $   $\underrightarrow{Dry/ether}$  

 $C_{4}H_{9}-C_{4}H_{9}+C_{4}H_{9}-C_{2}H_{5}+C_{2}H_{5}-C_{2}H_{5}$

  octane              Hexane                Butane

• Chemistry - General questions