Carbon

Q.

What is the atomic mass of nitrogen?

Q.

Why is isotope of carbon c-12 is used as standard unit for atomic mass and molecular mass

Q. Question 1
Define the atomic mass unit.

Q. Define radicals.

Q. Average atomic mass of magnesium is 24.31. AMU this magnesium is composed of 79% mole of 24 mg and remaining 21 mole percent of 25 mg and 26 MG .calculate mole percent of 26 mg

Q.

Name the father of organic chemistry?

Q.

Arrange Ethane, Ethene and Ethyne in decreasing order of the bond strength between the two carbon atoms in the given hydrocarbons.

1. Ethene > Ethane > Ethyne

2. Ethane > Ethene > Ethyne

3. Ethyne = Ethene = Ethane

4. Ethyne > Ethene > Ethane

Q. Atomic mass of carbon is ____ u.

1. 12
2. 6
3. 4
4. 8

Q.

What is the nuclear charge of a carbon atom?

1. - 6

2. + 6

3. + 4

4. - 4

Q. Define one mole , Avogadro number and gram atomic mass

Q. Screening effect of Br and effective nuclear charge for valency electron

Q. What is the colour of methane gas at room temperature?

1. Green
2. Yellow
3. Red
4. Colourless

Q.

The atomic weight of Cl is:

1. 35.5

2. 36

3. 37

4. 35

Q.

Name a non-metal which is known to form the largest number of compounds.

Q.

The statement that is not true for the long form of periodic table is-

1. It helps to predict the relative ionicity of bond between any two elements

2. It reflects the sequence of filling the electrons in order

3. .It reflects the physical and chemical properties of the elements

4. It helps to predict the stable valency states of the elements

Q.

All combustion reactions are always exothermic which occur in the presence of excess air or oxygen. Substances acting as fuels undergo combustion when heated. It is not necessary that a particular substance undergoing combustion may burn also. The human body is just like a furnace or machine in which various foodstuffs that we eat undergo combustion. They provide the desired energy needed for the bodys function.
Why is L.P.G. preferred to coke as a fuel?

Q. Why can't Alpha particles be 4 times charged hydrogen atoms?
​​​​​ why are they double charged Helium atoms

Q. All the compounds given below are allotropes of carbon except ________.

1. diamond
2. carbon dioxide
3. graphite
4. fullerene

Q.

The difference between 100 moles of sodium and sodium ions is 5.48002g. Calculate the mass of an electron.

Q.

Carbon burns in oxygen gas to produce

1. crackling sound

2. blue flame

3. white fumes

4. white ash

Q.

An ion with 5 protons, 6 neutrons and a charge of +3 has an atomic number of-

1. 5

2. 8

3. 11

4. 6

Q. Biogas is not very inflammable.

1. True
2. False

Q. Which of the following statements about carbon are true?

1. It is a non-metal.
2. Its valency is six.
3. Its electronic configuration is (2, 4).
4. It has an atomic mass of 14 u.

Q. Why isn't the definition of 1amu- the mass of one atom of hydrogen(Protium)?

Q.

Instead of gaining 1 electron , why does the hydrogen atom loses 1 electron ?

Q.

One atomic mass unit is a mass unit equal to exactly one twelfth (1/12^th) the mass of one atom of ___________.

1. Nitrogen -14

2. Silicon-14

3. Carbon-14.

4. Carbon-12

Q.

Why is the atomic mass of chlorine taken as 35.5? [2 MARKS]

Q. What do you understand from the statement"relative atomic mass of sulphur is 32"?

Q. State the nature of compounds formed when group 17 elements combine with (i) metals.​

Q.

How can an element attain stability?

1. Gaining electrons

2. Losing electrons

3. Sharing electrons

4. Creating electrons