CBSE 12TH CHEMISTRY - Online Test
Q1. Saturated solution of is used to make 'salt bridge' because
Answer : Option C
Explaination / Solution:
Saturated solution of is used in salt bridge because of same mobility o f and
Q2. Decomposition of benzene diozonium chloride by using Cu2Cl2/HCl to form chlorobenzene is
Answer : Option C
Explaination / Solution:
Q3. For an endothermic reaction, the minimum value for the energy of activation in terms of will be
Answer : Option C
Explaination / Solution:
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Q4. Liquid – liquid sols are known as
Answer : Option B
Explaination / Solution:
Liquid in liquid sols are emulsions
Q5. Conjugated protein is.
Answer : Option B
Explaination / Solution:
Conjugated protein is phosphoprotein.
Q6. n – propyl bromide on treating with alcoholic KOH produces
Answer : Option A
Explaination / Solution:
Alkenes can be prepared from alkyl halides by treatment with alcoholic solution of caustic potash (KOH) at about 353-363 K. This reaction is known as dehydrohalogenation of alkyl halides.
Q7. 35 mL of 0.1 M solution is used to neutralize 25 mL of barium hydroxide. The molarity of Barium hydroxide solution is
Answer : Option A
Explaination / Solution:
Q8. Esterification is the reaction of one of the below compounds with alcohol
Answer : Option A
Explaination / Solution:
Carboxylic acid and alcohol reacts to form an ester.
Q9. Leaching of gold is done by
Answer : Option A
Explaination / Solution:
Cyanide forms soluble complex with the gold.
Q10. The crystals of ferrous sulphate on heating give
Answer : Option D
Explaination / Solution:
FeSO4 on heating gives Fe2O3+SO2+SO3+H2O.
