CBSE 11TH CHEMISTRY - Online Test
Q1. In trivalent state, for example, the trichlorides, being covalent are hydrolysed in water form
Answer : Option D
Explaination / Solution:
Trihalides hydrolysis to form tetrahedral structure with four covalent bonds.
Q2. Diamond is covalent, yet it has high melting point. because of
Answer : Option A
Explaination / Solution:
carbon atom undergoes Sp3 hybridization and linked to four other carbon atoms by using hybridized orbitals in tetrahedral fashion led a rigid three dimensional extended network thought the lattice.
Q3. The valence shell electronic configuration of p-block elements is ns2np1 - 6 But this is not true in the case of
Answer : Option A
Explaination / Solution:
As only one Ist period element of p-block, it has unique 1s2 configuration besides other element of that block (ns2np1 - 6) . It is a noble gas.
Q4. Which is most easily liquefiable rare gas?
Answer : Option A
Explaination / Solution:
Xe is most easily ( for atmospheric cool air ) liquefiable rare gas.
Q5. Me3SiCl is used during polymerisation of organo silicones because
Answer : Option B
Explaination / Solution:
the chain length of the polymers can be controlled by adding Me3SiCl which blocks the ends of the chain to produce silicone
Q6. Which of the following statements are correct?
Answer : Option C
Explaination / Solution:
Fullerence have cage like spheroidal molecular ( C60) structure and have no dangling bonds.
Q7. Regular use of which of the following fertilizers increases the acidity of the soil?
Answer : Option C
Explaination / Solution:
Ammonium sulphate addition increases acidity in the soil.
In the presence of water and oxygen in the soil, ammonium and sulfate are decomposed by naturally occurring microbes. During this process, acids are released into the soil, along with nitrogen and sulfur compounds.
Q8. The percentage of p-character in the orbitals forming P - P bonds in is
Answer : Option C
Explaination / Solution:
obitals forming P-P bond is hybridised therefore have 75% p character.
Q9.
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
Q10. In which of the following compounds, nitrogen exhibits highest oxidation state?
Answer : Option A
Explaination / Solution:
In azide () have oxidation state -1/3
