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Class 11 - Chemistry मॉक टेस्ट

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Class 11 Chemistry
Which conformation of ethane is the most stable, and why?
A Staggered, because it has the least steric repulsion between C−H bonds
B Eclipsed, because it has maximum overlap of orbitals
C Staggered, because it has maximum dipole-dipole interaction
D Eclipsed, because it has minimum torsional strain
CUET Chemistry
Lanthanoid contraction is responsible for which of the following observations?
A Lanthanoids are highly reactive and cannot be extracted from their oxides
B The atomic radii of scandium and yttrium are nearly identical
C The first ionisation enthalpy of lanthanoids decreases across the period
D The atomic radii of Zr (40) and Hf (72) are nearly identical
JEE Main Chemistry
The bond angle in H₂O is 104.5° instead of 109.5° due to:
A Hydrogen bonding
B Lone pair — lone pair repulsion
C Lone pair — bond pair repulsion
D Steric hindrance
Class 11 Chemistry
For the equilibrium reaction: N₂O₄(g) ⇌ 2NO₂(g), ΔH = +57.2 kJ mol⁻¹. Which set of conditions will shift the equilibrium towards the formation of NO₂?
A High temperature and low pressure
B Low temperature and high pressure
C High temperature and high pressure
D Low temperature and low pressure
BITSAT Chemistry
The coordination number and geometry of Ni(CO)₄ respectively are:
A 4, tetrahedral
B 4, square planar
C 6, octahedral
D 4, seesaw
BITSAT Chemistry
The van't Hoff factor (i) for a compound that undergoes dimerization in solution is:
A i < 1
B i > 1
C i = 1
D i = 0
JEE Main Chemistry
Which of the following is a secondary alcohol?
A Methanol
B Propan-2-ol
C Propan-1-ol
D 2-Methylpropan-2-ol
JEE Main Chemistry
The spin-only magnetic moment of the complex [Fe(CN)₆]³⁻ is (atomic number of Fe = 26):
A 1.73 BM
B 2.83 BM
C 5.92 BM
D 0 BM

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