CBSE 12TH CHEMISTRY - Online Test
Q1. In which of the following systems, the dispersed phase and dispersion medium are both solid?
Answer : Option A
Explaination / Solution:
It is a Sol type of colloid.
Q2. One of the following hassweet taste
Answer : Option A
Explaination / Solution:
Glucose, glycine have sweet taste.
Q3. Lucas reagent is
Answer : Option A
Explaination / Solution:
Lucas reagent is a solution of anhydrous zinc chloride (Lewis acid) in concentrated hydrochloric acid. It is used as a reagent to test alcohols and classify them in accordance to their reactivity. The reaction is a substitution reaction where the chloride of the zinc chloride gets replaced by the hydroxyl group of the alcohol.
Q4. The molal depression constant depends upon
Answer : Option B
Explaination / Solution:
Kf is characteristic of solvent.
Q5. The geometry of amines is
Answer : Option D
Explaination / Solution:
An amine molecule has the shape of a somewhat flattened triangular pyramid, with the nitrogen atom at the apex. An unshared electron pair is localized above the nitrogen atom.
Q6. The copolymerisation of 1, 3 – butadiene and acrylonitrile
Answer : Option C
Explaination / Solution:
Copolymerisation of 1,3 butadiene and acrylonitrile gives Buna N.
Q7. Formula of oleum is
Answer : Option B
Explaination / Solution:
Oleum is pyrosulphuric acid (H2S2O7 )
Q8. What is the temperature of zone of slag formation?
Answer : Option D
Explaination / Solution:
Slag is formed in the temperature range 1000-1300 oC
Q9. Mohr’s salt is a
Answer : Option D
Explaination / Solution:
Mohr salt is an example of double salt. Mohr Salt is FeSO4. (NH4)2SO4.6H2O.
Q10. The aldehydes and ketones undergo one of the following reactions.
Answer : Option B
Explaination / Solution:
Aldehydes and Ketones undergoes nucleophilic addition reaction .
