Electron | MCQs

Explanation

The correct electronic configuration for carbon is 1s²2s²2p².

Indicating it has 6 electrons: 2 in the 1s orbital, 2 in the 2s orbital, and 2 in the 2p orbital.

Explanation

The p orbital has 2 lobes that are oriented in space along specific axes (x, y, and z).

In addition to p orbitals, other orbitals include:

• s orbitals: 1 lobe (spherical)
• d orbitals: 4 or 5 lobes
• f orbitals: 8 lobes

Explanation

The -NH₂ group is an electron-donating substituent that releases electrons to the benzene ring through resonance.

It increasing the electron density on the ring.

Explanation

Oxidation half-reaction :

Zn - 2e = Zn^2+

Reduction half-reaction :

Cu^2+ +2e = Cu

Zn donates two electrons to form Zn^2+ ion and Cu^2+ gains two electrons to form Cu metal.

Thus, Cu^2+ is the oxidant.

Explanation

Explanation

During light reactions, PS II receives electrons from the splitting of water.

This process, known as photolysis, generates oxygen, protons, and electrons.

It replenishing the electron supply in Photosystem II.

Explanation

Enzyme NADP reductase is responsible for reducing NADP⁺.

It catalyzes the transfer of electrons to NADP⁺, forming NADPH, which is used in the Calvin cycle for carbon fixation.

Explanation

In the journey of electrons from photosystem II to photosystem I, plastocyanin is reduced by the cytochrome complex.

The cytochrome complex facilitates the transfer of electrons to plastocyanin, which then carries them to Photosystem I.

Explanation

Because they're reluctant to share electrons from their filled outer electron shells, noble gases are generally considered unreactive

Explanation

when a donor impurity interacts with a pure crystal, it leads to the formation of an n-type semiconductor.

Concept:

The process of deliberate addition of a desirable impurity to a pure semiconductor so as to increase its conductivity is called doping

The impurity atoms added are called doped. 

Semiconductors doped with the impurity atoms are called extrinsic.

Explanation:

The element whose atom has five valance electrons are called pentavalent impurities e.g As, P, Sb, etc

These impurities are called donor impurities because they donate an extra free electron.

The semiconductor material with the majority carrier as the electron is called an n-type semiconductor