Question of Exercise 5

Question Which of the following hydrocarbons cannot be prepared by Kolbe’s electrolytic process?

Answer

Option 1 C3H8

Option 2 C2H6

Option 3 C4H10

Option 4 C6H14

Frequently Asked Questions

Oxidation involves

A: Loss of electrons

B: Gain of electrons

C: Increase in the valency of negative part

D: Decrease in the valency of positive part

Solution:

Explanation:

• Oxidation is the process in which there is an increase in oxidation number of the central atom of a compound or element .
• It involves gain of oxygen or loss of electrons.

Final answer:

Hence, correct option is A, i.e. loss of electrons.

Gram molecular mass of CH3OH is

A: 28g

B: 16g

C: 32g

D: 62g

Solution:

Explanation:

Gram molecular mass(G.M.M) is mass in grams of one mole of molecule of any substance.

So, the Gram molecular mass of methanol is

(CH3OH) =Mass of carbon+4× Mass of hydrogen+Mass of oxygen

=12 gm+4(1)gm+16gm

=32gm

Final answer:

Hence, the correct option is C, i.e. 32g.

What is the difference between atomic mass and mass number

Solution:

Explanation:

The differences between atomic mass and mass number are given as

 Atomic mass Mass number The average number of protons and neutrons in all natural isotopes of an element is its atomic mass. The sum of protons and neutrons in an atom is the mass number. It can have a fractional value. It will never be in fraction.

Final answer:

Hence, the differences between atomic mass and mass number are given below.

 Atomic mass Mass number The average number of protons and neutrons in all natural isotopes of an element is its atomic mass. The sum of protons and neutrons in an atom is the mass number. It can have a fractional value. It will never be in fraction.

Draw a sketch of Bohrs model of an atom with four shells

Solution:

Explanation:

The sketch of Bohr’s model is

Final Answer:

The sketch of Bohr’s Model is :

The charge on a proton is

A: -1.602×10-19C

B: 1.602×10-19C

C: 0

D: None of the above

Solution:

Explanation:

Protons are the positively charged particles that make up a hydrogen atom's nucleus. A proton has a mass of 1.6726219×10-27 kilograms.

A proton's mass is the same as that of a hydrogen atom. One electron and one proton make up a hydrogen atom. Because the mass of an electron is deemed unimportant, the mass of a hydrogen atom can be said to be equal to the mass of a proton. A proton has a mass of 1840 times that of an electron.

A proton's charge is the same as and opposite that of an electron. As a result, it has a single positive charge having the value 1.602×10-19C.

Final answer:

Option B is the correct answer, The charge on a proton is 1.602×10-19C.