Which among the following is colourless?
Zn²⁺ correct as per chemistry principle.
Ref: NCERT Chemistry Class XI and XII
#chemical properties
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Which of the following cannot form an azeotrope?
Benzene + Toluene correct as per chemistry principle.
Ref: NCERT Chemistry Class XII — Solutions
Maximum basic in gas phase is
(CH₃CH₂)₃N correct as per chemistry principle.
Ref: NCERT Chemistry Class XI and XII
Which of the following has maximum pKₐ value?
Carbolic acid correct as per chemistry principle.
Ref: NCERT Chemistry Class XI and XII
→ A, A is formed by Claisen condensation; which is/are true about A?
All true correct as per chemistry principle.
Ref: NCERT Chemistry Class XII — Organic Chemistry
Which one of the following statements regarding helium is incorrect
It is used to fill gas balloons instead of hydrogen because it is lighter and non - inflammable correct as per chemistry principle.
Ref: NCERT Chemistry Class XII — Coordination Compounds
Which is true with regard to the properties of PH₃
PH3 has fishy smell correct as per chemistry principle.
Ref: NCERT Chemistry Class XI and XII
Of the following the most acidic is:
P₂O₅ correct as per chemistry principle.
Ref: NCERT Chemistry Class XII — Coordination Compounds
Which property explains the basic nature of amines?
The lone pair on nitrogen allows amines to accept a proton, making them basic, as per the PDF’s basicity section.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1
Which of the following statements about actinoids is correct?
Actinoids exhibit variable oxidation states due to comparable energies of 5f, 6d, and 7s orbitals, allowing participation of multiple electrons in bonding.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Which of the following d-block elements in period 4 has an exceptional electronic configuration?
Cr (Z=24) has an exceptional configuration (3d⁵ 4s¹) due to the stability of a half-filled 3d subshell, unlike Sc (3d¹ 4s²), Mn (3d⁵ 4s²), or Fe (3d⁶ 4s²).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
Which group 15 element forms a hydride with the lowest thermal stability?
Thermal stability of group 15 hydrides decreases down the group due to weaker X-H bonds. BiH₃ (Bi, largest) has the lowest stability among NH₃, PH₃, AsH₃, and BiH₃.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
