1 Basic Principles of Organic Chemistry
How many stereoisomers are therefor tartaric acid? 1) 2 2) 3 3) 4 4) 5
SOLUTION
d-tartaric acid, l-tartaric acid,meso-tartaric acid
2 Surface Chemistry
Which property of colloidal solution is independent of charge on the colloidal particles?
1) Coagulation 2) Electrophoresis 3) Electroosmosis 4) Tyndall effect
The Tyndall effect is light scattering by particles in a colloid or in a very fine suspension. Coagulation is a chemical process that involves neutralization of charge whereas flocculation is a physical process and does not involve neutralization of charge. Electrophoresisstrong - > is the motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field. Electrophoresis of positively charged particles is sometimes called cataphoresis, while electrophoresis of negatively charged particles is sometimes called anaphoresis. Electro-osmosisstrong - > refers to the movement of liquid in a porous material due to an applied electric field
3 Hydrocarbons
Which of the following compounds is used in antiknock compositions to prevent the deposition of oxides of lead on spark plug combustion chamber and exhaust pipe
1) glycol 2) glycerol 3) benzene 4) 1,2-dibromoethane
4 S – Block Elements
The metal oxides of alkaline earth metal can be formed by heating corresponding carbonates except:
1) BeO 2) MgO 3) CaO 4) none
5 Surface Chemistry
The adsorption of a gas, on a solid surface, varies with pressure of the gas in which of the following manner?
1) Slow fast independent of the pressure 2) Fast slow independent of the pressure 3) Independent of the pressure slow fast 4) Independent of the pressure fast slow
The adsorption of a gas on the solid surface varies in the following manner.
Fast ? Slow ?independent of pressure.
6 Haloalkanes and Haloarenes
When chlorine reacts with ethyl alcohol, it forms:
1) chloral 2) chloroform 3) ethyl chloride 4) carbon tetrachloride.
Solution
When chlorine reacts with ethyl alcohol in the presence of KOH, chloroform is obtained as a final product.
Cl2?+CH3?CH2?OH?CH3CHO+2HCl [oxidation]
CCl3?CHO + KOH--Hydrolysis??CHCl3? + HCOOK
7 Alcohols Phenols and Ethers
A compound X, when boiled with Na2CO3 solution gives glycol as the product. What is X
1) Ethylene 2) Ethylene oxide 3) Ethyl bromide 4) Ethy hydogen sulphate
8 Purification and Characterisation of Organic Compounds
In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by :
1) rubbing with cotton cloth
2) hot air blower
3) dry cotton wool
4) filter paper
Before weighing the soaked raisins, these should be dried gently with the help of filter paper to remove excess of water.
9 S – Block Elements
Alkaline earth metals have only positive oxidation state. This is due to their:
1) high melting points 2) high electronegativity 3) softness 4) low ionization potential
The alkaline earth metals have very low ionization energies. So, they easily lose electrons to form positively charged ions (cations).
10 P – Block Elements
When Reactivity of Halogen atom is minimum in
1) propyl oxide 2) propyl chloride 3) isopropyl chloride 4) isopropyl bromide
when carbonium is formed by isopropyl group it is more stable than that formed by n propyl group thus there reactivity will be more.
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