Coupon Accepted Successfully!



General configuration of outermost and penultimate shell is Description: 50645.png If n = 4 and x = 5, then the number of proton in the nucleus will be:
  1. >25
  2. <24
  3. 25
  4. 30
Solution (C)
Given n = 4x = 5
So Description: 50657.png
Total electron = 2 + 6 + 5 + 2 = 15
Electron in 1 + 2 orbit = 2 + 8 = 10
Total electron = 10 + 15 = 25
Number of electron = Number of proton
So total proton = 25


Which of the following is paramagnetic?
  1. Description: 50666.png
  2. Description: 50674.png
  3. Description: 50682.png
  4. Description: 50691.png
Solution (A)
Elements or ions containing unpaired electrons are paramagnetic.
Description: 50699.png
Description: 50706.png stage
Description: 52800.png
Because Description: 50719.png have 2 unpaired electrons in 3d subshell; therefore it is paramagnetic.


Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are,
  1. Description: 50728.png
  2. Description: 50739.png
  3. Description: 50749.png
  4. Description: 50757.png
Solution (A)
Description: 50765.png
In neutral medium:
Description: 50772.png
Description: 50780.png
In alkaline medium:
Description: 50792.png
In acidic medium:
Description: 50799.png


Copper displaces which of the metal from their salt solutions?
  1. Description: 50808.png
  2. Description: 50818.png
  3. Description: 50826.png
  4. All of these
Solution (A)
Description: 50838.png
Description: 50848.png no reaction
Description: 50857.png no reaction
Description: 50864.png
As it is clear that reduction potential of copper is more than Zn and Fe. Hence, it is unable to displace them from their salts.


In which of these processes platinum is used as a catalyst?
  1. Oxidation of ammonia to form Description: 50873.png
  2. Hardening of oils
  3. Production of synthetic rubber
  4. Synthesis of methanol
Solution (A)
Platinum acts as catalyst in the oxidation of ammonia to form nitric oxide. This reaction is used in the Ostwald’s method of nitric acid preparation.
Description: 50882.png
Description: 50892.png
Description: 50899.png

Test Your Skills Now!
Take a Quiz now
Reviewer Name