Comment on the $\angle \text{CNC}$ and $\angle \text{HNN}$ in ${\mathrm{CH}}_3\mathrm{NCS}$ and ${\mathrm{HN}}_3$ respectively.

Important Questions on Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Bond lengths (in $\mathrm{pm}$) of $\mathrm{C}-\mathrm{H}, \mathrm{C}-\mathrm{C}, \mathrm{C}=\mathrm{C}$ and $\mathrm{C}\equiv \mathrm{C}$ bonds, respectively are:

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The compound that has the largest $H–M–H$ bond angle $(M = N, O, S, C)$, is :

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

How many ions of the following have a bond order of  $2.5 ?$ 

${\mathrm{N}}_2^{-};{\mathrm{NO}}^{-};{\mathrm{C}}_2^{-};{\mathrm{N}}_2^{+};{\mathrm{C}}_2^{2-};{\mathrm{CN}}^{+}$

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

In which of the following the $\mathrm{C}-\mathrm{H}$ bond distance is the longest?

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

If enthalpy of atomization for $\mathrm{B}{\mathrm{r}}_2\left(\mathrm{l}\right)$ is $\mathrm{x }\mathrm{k}\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}$ and bond enthalpy for $\mathrm{B}{\mathrm{r}}_2$ is $\mathrm{y }\mathrm{k}\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}$, the relation between them

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The bond lengths (in $\mathrm{pm})$ of $\mathrm{C}-\mathrm{C}\text{,} \mathrm{C}\equiv \mathrm{C}$ and $\mathrm{C}=\mathrm{C}$ are:

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Average bond enthalpy of water is $464·5\mathrm{kJ} {\mathrm{mol}}^{-1}$. If the energy required to break first $\mathrm{O}-\mathrm{H}$ bond is $502\mathrm{kJ} {\mathrm{mol}}^{-1}$, how much energy per mol is required to break second $\mathrm{O}-\mathrm{H}$ bond ?

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Which of the following molecules has shortest $\mathrm{C}-\mathrm{C}$ bond length?

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The number of $\pi$ -bonds and $\sigma$ -bonds present in naphthalene are respectively

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The correct order of $\mathrm{C}-\mathrm{O}$ bond length is:

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Among the following species, the $\mathrm{H}-\mathrm{X}-\mathrm{H}$ angle ( $\mathrm{X}=\mathrm{B}, \mathrm{N}$ or $\mathrm{P}$ ) follows the order.

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Arrange the following compounds in increasing order of $\mathrm{C}-\mathrm{O}\mathrm{H}$ bond length: methanol, phenol, $\mathrm{p}$ -ethoxyphenol

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Pick the INCORRECT statement among those given below

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Maximum bond angle at nitrogen is present in which of the following?

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The correct order of bond dissociation enthalpy of halogens is:

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

There are two statements, one labelled as Assertion
(A) and the other as Reason (R). Examine both the statements carefully and mark the correct choice.
(A) The $\mathrm{O}-\mathrm{H}$ bond angle in ${\mathrm{H}}_2\mathrm{O}$ is greater than $\mathrm{S}-\mathrm{H}$ bond angle in ${\mathrm{H}}_2\mathrm{S}.$
(R) Due to larger size of $\mathrm{S}$, hydrogen bonding does not occur in ${\mathrm{H}}_2\mathrm{S}.$

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Which of the following compounds has highest $\mathrm{C}-\mathrm{X}$ bond strength?

EASY

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The intermolecular potential energy for the molecules$\mathrm{A}$ ,$\mathrm{B}$ , $\mathrm{C}$ and $\mathrm{D}$ given below suggests that:

HARD

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

The number of bonds between sulphur and oxygen atoms in ${\mathrm{S}}_2{\mathrm{O}}_8^{2-}$ and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively are:

MEDIUM

Physical Sciences>Matter and Its Interactions>Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.>Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

Among the following molecules, the one with the largest bond angle at the central atom is