Chemistry - Study Mode

[#591] Which one is the simplest form of alkane?
Correct Answer

(C) Methane

Explanation

Solution: The simplest alkane is methane. Methane contains only one carbon atom and four hydrogen atoms.

[#592] Which of the following is not a natural source of hydrocarbon?
Correct Answer

(D) Mica

Explanation

Solution: There are three main natural sources of hydrocarbons: natural gas, petroleum and coal. Mica is a natural occurring mineral that is based on a collection of silicate minerals and composed of varying amounts of potassium, iron, aluminum, magnesium and water. It is widely used in the electrical industry.

[#593] The element with highest first ionisation energy is
Correct Answer

(B) Helium

Explanation

Solution: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

[#594] In a period from Li to F, ionisation potential
Correct Answer

(A) Cannot be predicted

Explanation

Solution: Ionization energy increases along a period with increase in atomic number. However, in the periodic table, going from left to right, while the Ionization Potential of Li is 5.4 eV, that of Be: 9.3 eV, B: 8.3 eV, C: 11.3 eV, N: 14.6 eV, O: 13.6 eV, and F: 17.0 eV.

[#595] In the periodic table of elements, on moving from left to right across a period, the atomic radius
Correct Answer

(A) Decreases

Explanation

Solution: In the periodic table of elements, on moving from left to right across a period, the atomic radius decreases.