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A mixture of two volatile liquids A and B shows a negative deviation from Raoult's law. Which of the following statements is INCORRECT regarding this mixture?
The enthalpy of mixing is negative.
The volume of mixing is negative.
The boiling point of the mixture is lower than that predicted by Raoult's law.
The intermolecular forces between A and B are stronger than the A-A and B-B interactions.
If two elements A and B combine in different ratios to form two compounds, and , then according to the Law of Multiple Proportions:
The ratio of masses of B which combine with a fixed mass of A is a simple whole number ratio.
The ratio of masses of A which combine with a fixed mass of B is a simple whole number ratio.
The ratio of masses of A which combine with a fixed mass of A is a simple whole number ratio.
The ratio of masses of B which combine with a fixed mass of B is a simple whole number ratio.
Two projectiles are launched from the same point with the same speed . One is launched at an angle and the other at with the horizontal. What is the minimum distance between these two projectiles during their flight?
0
\frac{u^2}{2g}
\frac{u^2}{4g}
\frac{u^2}{g}
A particle is in equilibrium under the action of three forces , , and . If the angle between and is doubled and the magnitude of is halved, while the other forces remain unchanged, which statement is true for the new equilibrium condition?
The system remains in equilibrium.
Equilibrium cannot be maintained with the given changes alone.
The direction of must be reversed.
The magnitude of must be doubled.
Let and be two non-zero vectors such that . Which of the following must be true?
and are parallel.
and are perpendicular.
and have equal magnitudes.
and are unit vectors.
Which of the following statements regarding the formation of a covalent bond is INCORRECT?
The formation of a covalent bond always results in a net decrease in potential energy, leading to greater stability compared to isolated atoms.
Overlapping of atomic orbitals leads to increased electron density between the nuclei, contributing to bond formation.
The strength of a covalent bond is inversely proportional to the extent of orbital overlap.
The stability of a covalent bond arises from the balance between attractive forces between nuclei and electrons, and repulsive forces between nuclei and between electrons.
The molecule exhibits a trigonal bipyramidal geometry. Which of the following BEST explains the difference in bond lengths between axial and equatorial bonds in ?
Difference in hybridization of axial and equatorial chlorine atoms.
Unequal sharing of electrons between phosphorus and axial vs. equatorial chlorine atoms.
Greater repulsion experienced by axial bond pairs due to 90° interactions with equatorial bond pairs.
The presence of d-orbitals in phosphorus preferentially influences axial bond lengths.
A molecule has a bond angle of 180°. Assuming that the central atom X follows the octet rule and forms no coordinate bonds, which of the following statements regarding the molecule is MOST likely FALSE?
The central atom X uses hybrid orbitals for bonding.
The molecule is linear.
The central atom X has no lone pairs of electrons.
The molecule must be polar if X and Y have different electronegativities.
Considering Fajan's rules, arrange the following compounds in increasing order of their melting points: SnCl2, SnCl4, SiCl4, PbCl2
SnCl2 < SnCl4 < SiCl4 < PbCl2
SiCl4 < SnCl4 < SnCl2 < PbCl2
PbCl2 < SnCl2 < SnCl4 < SiCl4
SnCl4 < SiCl4 < PbCl2 < SnCl2
Which factor does NOT contribute significantly to the difference in bond lengths between single, double, and triple bonds?
Bond Order
Atomic Size
Bond Strength
Electronegativity differences
