What is the angle of incidence when light ray falls on a plane mirror and the angle of reflection is 35°?

The correct answer is A: 35°. According to law of reflection, angle of incidence equals angle of reflection

In the light-dependent reactions, the splitting of water molecules produces oxygen, hydrogen ions, and:

The correct answer is C: Electrons. Water photolysis (2H2O → O2 + 4H+ + 4e-) releases electrons that are transferred through electron transport chains.

The process by which plants prepare their food using sunlight is known as:

The correct answer is B: Photosynthesis. Photosynthesis is the process where plants use sunlight, water, and CO₂ to produce glucose and oxygen. The equation is 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂.

In C4 photosynthesis, the first stable compound formed after CO2 fixation is:

The correct answer is B: Oxaloacetate. In C4 plants, PEP carboxylase fixes CO2 into oxaloacetate (4-carbon compound), unlike C3 plants where RuBisCO produces 3-PGA. This adaptation reduces photorespiration and is efficient in hot climates.

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Showing 1–2 of 2 questions in Chemistry

Q.1 Medium Chemistry

In the reaction between potassium permanganate and oxalic acid in acidic medium, what is the ratio of KMnO₄ to H₂C₂O₄ in the balanced equation?

A 1:2

B 2:5

C 3:5

D 5:2

Correct Answer: B. 2:5

Explanation:

The balanced equation for this redox reaction in acidic medium is: 2KMnO₄ + 5H₂C₂O₄ + 3H₂SO₄ → K₂SO₄ + 2MnSO₄ + 10CO₂ + 8H₂O.

Potassium permanganate acts as an oxidizing agent (Mn⁷⁺ → Mn²⁺), while oxalic acid is oxidized (C²⁺ → C⁴⁺), giving the 2:5 molar ratio.

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Q.2 Medium Chemistry

What is the hybridization state of the central carbon atom in the carbonate ion (CO₃²⁻)?

A sp

B sp²

C sp³

D sp³d

Correct Answer: B. sp²

Explanation:

In the carbonate ion CO₃²⁻, the central carbon atom forms three sigma bonds with oxygen atoms and is involved in resonance structures with delocalized pi electrons.

This trigonal planar geometry requires sp² hybridization, with three hybrid orbitals arranged at 120° angles and one unhybridized p orbital for pi bonding.

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