CBSE 12TH CHEMISTRY - Online Test
Q1. Which of the following is the strongest Lewis base?
Answer : Option A
Explaination / Solution:
Because of lower electronegativity of I
Q2. Substances that are strongly attracted by applied magnetic field and can be permanently magnetized are
Answer : Option C
Explaination / Solution:
Ferromagnetic substance get permanently magnetised in applied Magnetic Field.
Q3. Ultrapurification method is used for
Answer : Option A
Explaination / Solution:
Fact
Q4. What is the shape of Fe(CO)5 molecule?
Answer : Option A
Explaination / Solution:
CN is 5.
Q5. CH3 CHO and C6 H5 CH2 CHO can be distinguished chemically by:
Answer : Option D
Explaination / Solution:
CH3 CHO will give iodoform test and C6 H5 CH2 CHO will not give iodoform test.
Q6. The element in soap which makes it soft on skin is
Answer : Option C
Explaination / Solution:
It is potassium which makes it soft on skin.
Q7. Which of the following ligand gives chelate complexes?
Answer : Option D
Explaination / Solution:
Oxalate is a bidentate ligand.
Q8. An electrochemical method is to provide a sacrificial electrode of another metal (like Mg, Zn, etc.) which corrodes itself but saves the object. A typical example is
Answer : Option C
Explaination / Solution:
Galvanization is a process in which iron is coated with reactive metal like Zn which get corroded hence preventing iron from corrosion.
Q9. Hydrocarbons are prepared from Grignard reagent by
Answer : Option C
Explaination / Solution:
Grignard reagent abstracts acidic hydrogen from H2O forming alkane.
Q10.
The relationship between temperature and rate constant is given by the relation:
Answer : Option C
Explaination / Solution:
A is Arrhenius factor.
