Physical Properties

Q.

As the number of carbon atoms in a chain increases, the boiling point of alkanes _________.

1. Increases

2. Decreases

3. Remains same

4. May increase or decrease

Q.

Dilute Sulphuric acid is a ___ conductor of electricity.

Q. Gaseous reducing agent which is basic in nature

Q. Out of the given materials, which one of the following has the maximum interparticle space at a given temperature?

1. Honey
2. Methane
3. Milk
4. Silver

Q.

The density of nitric acid is greater than that of water.

1. True

2. False

Q.

Give a reason why water is called a universal solvent but an alkali is not?

Q. _____ is the property of carbon atom that enables it to form stable long chains or cyclic compounds with itself.

1. Carbocation
2. Catenation
3. Hydrogenation
4. Dehydration

Q.

Two successive homologues of ethanol $\left(C_2{H}_{5}OH\right)$ are ………… .

Q. Naphthalene is a :

1. ionic solid
2. covalent solid
3. metallic solid
4. molecular solid

Q. Write structural formulae of the organic compounds 'A', 'B', 'C' and 'D' in the following sequence of reactions: 'A' $+C{H}_{3}MgBr-H_{2}O\to C{H}_{3}C{H}_{2}CH\left(OH\right)C{H}_3$-conc. $H_{2}S{O}_4{\to }^{\prime }{B}^{\prime }-B{r}_2{\to }^{\prime }{C}^{\prime }-alc.KOH{\to }^{\prime }{D}^{\prime }$.

Q.

Calculate the molar mass of the following substances: [5 MARKS]

(a) Ethyne, C₂H₂

(b) Sulphur molecule, S₈

(c) Phosphorus molecule, P₄ (atomic mass of phosphorus = 31)

(d) Hydrochloric acid, HCl

(e) Nitric acid, HNO₃

Q. Graphite is soft, lubricant and extremely difficult to melt. The reason for this anomalous behaviour is that graphite :

1. has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
2. is a non-crystalline substance
3. is an allotropic form of carbon
4. has only single bonds between carbon atoms