Melting and Boiling Point

Q. Assertion : $H_2{O}_2$ has higher boiling point than water.
Reason : $H_2{O}_2$ has stronger dipole-dipole interactions than that shown by water.

1. If both assertion and reason are true and reason is the correct explanation of assertion
2. If assertion is true but reason is false
3. If both assertion and reason are true but reason is not the correct explanation of assertion
4. If both assertion and reason are false

Q. The boiling point of aldehyde and ketones depend upon:

1. Intermolecular dipole-dipole repulsion
2. Intermolecular dipole-dipole attraction
3. Intermolecular induced dipole-dipole attraction
4. None of these

Q. 17.During the fractional distillation of air, is separated firstly because(A) Argon, its boiling point is minimum among rest of the gases.IT(B) Oxygen, its boiling point is maximum among rest of the gases.(C) Nitrogen, its boiling point is minimum among rest of the gases.(D) Argon, its boiling point is maximum among rest of the gases.

Q. Assign reason for the following : (i) Sulphur in vapour state exhibits paramagnetism. (ii)Fluorine is the strongest oxidising agent among halogens. (iii) In spite of having same electronegtaivity, oxygen forms hydrogen bond while chlorine does not.

Q. The hydrides of the first element in group 15-17, namely $N{H}_3,H_{2}O$ and $HF$, respectively show abnormally high values for melting and boiling points. This is due to:

1. small size of $N,O$ and $F$
2. the ability to form extensive intermolecular $H$-bonding
3. the ability to form extensive intramolecular $H$-bonding
4. effective van der Waal's interaction

Q. $H_{2}S<H_{2}Se<H_{2}Te<H_{2}O$ This is the correct boiling point order. If true enter 1 else 0.

1. 1

Q. does acetone and benzene together show a positive deviation they increase vapour pressure and decrease the boiling point?

Q. Carbon and silicon belong to group $14$. what is nature of carbide of silicon?

1. Ionic
2. Covalent
3. interstitial
4. None of these

Q.

1. True
2. False

Q. At room temperature and under normal conditions, oxygen is a ___ while the other chalcogens are ___.

Q. The element with least melting point in VIA group is :

1. Se
2. O
3. S
4. Te

Q. Among the hydrides of group $16$ elements, which has the lowest boiling point?

Q. The element with highest boiling point in the following is :

1. Oxygen
2. Sulphur
3. Tellurium
4. Polonium