Chemistry - Online Test
Q1.
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
Answer : Option A
Explaination / Solution:
reaction of Cl2 and hot and concentrated sodium hydroxide solution is as below:
6 NaOH + 3Cl2 → 5NaCl + NaClO3 + 3H2O
Here Cl2 disproportionate to -1 and +5
Q2. In which of the following compounds, nitrogen exhibits highest oxidation state?
Answer : Option A
Explaination / Solution:
In azide () have oxidation state -1/3
Q3. Which of the following statements regarding ozone is not correct?
Answer : Option A
Explaination / Solution:
bond order of O-O bond in ozone is less than that in oxygen.
Ozone molecule can be represented as resonance hybrid of two canonical structures, each structure have one single bond on one side and double bond on the another side.
Q4. Among the following which is the strongest oxidizing agent?
Answer : Option B
Explaination / Solution:
F2 is most electronegative element hence it readily get reduced to F- ion so it is very strong oxidizing agent.
Q5. The brown ring test for nitrates depends on
Answer : Option C
Explaination / Solution:
in ring test of nitrates nitrate ion is reduced to nitric oxide.
Q6. One mole of magnesium nitride on the reaction with an excess of water gives:
Answer : Option C
Explaination / Solution:
on hydrolysis roduces two moles of ammonia.
Q7. Argon is used
Answer : Option A
Explaination / Solution:
Ar is used in high temperature welding to provide inert atmosphere.
Q8. Atoms in a molecule of white phosphorus are arranged regularly in the following way
Answer : Option D
Explaination / Solution:
in P4 four P atoms are arranged at the corners of tetrahedron.
