Chemistry - Online Test
Q1. Straight line graph for first order reaction is obtained between
Answer : Option B
Explaination / Solution:
Ln[R]=ln[Ro]−kt
Q2. An example of autocatalysis is
Answer : Option A
Explaination / Solution:
Oxidation of oxalic acid by acidified KMnO4 is example of autocatalysis.
Q3. Gay Lussac’s law states that at constant volume, pressure of a fixed amount of a gas
Answer : Option A
Explaination / Solution:
P α T (at constant V).
Q4. At a given temperature equilibrium is possible only in a system which is a
Answer : Option D
Explaination / Solution:
Equilibrium is possible only in a closed system at a given temperature for physical processes. When equilibrium is attained for a physical process, it is characterized by constant value of one of its parameters at a given temperature.
Q5. hydrolysis of starchyields
Answer : Option A
Explaination / Solution:
Hydrolysis of starch give glucose.
Q6. Primary alcohols are prepared by reduction of carboxylic acids. Though lithium aluminium hydride is a strong reducing agent, it is not used in the reaction. Because
Answer : Option C
Explaination / Solution:
Carboxylic acids are reduced to primary alcohols in excellent yields by lithium aluminium hydride, a strong reducing agent.
However, LiAlH4 is an expensive reagent, and therefore, used for preparing special chemicals only. Commercially, acids are reduced to alcohols by converting them to the esters followed by their reduction using hydrogen in the presence of catalyst (catalytic hydrogenation).
Q7. Hinsberg’s reagent reacts with primary and secondary amines to form sulphonamides. This reagent is also known as
Answer : Option C
Explaination / Solution:
this is benzenesulphonyl chloride or hinsberg reagent.
Q8. Carbon-carbon double bond in alkenes consists of
Answer : Option A
Explaination / Solution:
sigma bond is formed by head-on overlap of sp2 hybridised orbitals while the pi bond is formed by lateral or sideways overlapping of the two 2p-orbitals of the two carbon atoms. Alkenes contain 1 weak pi bond and 1 strong sigma bond.
Q9. Two solutions have different osmotic pressures. The solution of higher osmotic pressure is called
Answer : Option B
Explaination / Solution:
Hypertonic solutions are having high Osmotic Pressure.
Q10. Aurous chloride and auric chloride are written as Au(l)Cl and Au(lll)Cl3.The roman numeral in parenthesis after the symbol of the metal in the molecular formula represents the
Answer : Option C
Explaination / Solution:
The roman number represents the oxidation number/oxidation state of an element.It is popularly known as Stock notation given by the german scientist Alfred stock.
