The SI unit of pressure is Pascal (Pa). How is it related to other SI units?

The correct answer is D: All of the above. Pascal = N/m² = kg/(m·s²) = J/m³. All these expressions are dimensionally equivalent representations of pressure, showing the fundamental relationship between force, area, and SI base units.

What is the SI unit of pressure?

The correct answer is B: Pascal. Pascal (Pa) is the SI unit of pressure, equal to 1 N/m²

Which of the following is a C4 plant commonly found in tropical regions?

The correct answer is C: Sugarcane. Sugarcane is a C4 plant adapted to high light and temperature conditions. C4 plants first fix CO2 into a 4-carbon compound (oxaloacetate).

Two bodies of masses 2 kg and 3 kg are dropped from the same height in vacuum. Which statement is correct?

The correct answer is C: Both reach ground simultaneously. In vacuum, acceleration due to gravity is independent of mass. Both bodies experience the same gravitational acceleration (g ≈ 9.8 m/s²) and fall from the same height, so they reach the ground simultaneously.

A copper wire is stretched elastically. Which property is NOT affected?

The correct answer is A: Young's modulus. Young's modulus is a material property independent of the wire's dimensions or elastic deformation state. It depends only on the material composition and atomic structure, not on physical changes.

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Showing 1–2 of 2 questions in Chemistry

Q.1 Hard Chemistry

Which of the following compounds exhibits both ionic and covalent bonding characteristics and is commonly used in coordination chemistry?

A Sodium chloride

B Potassium hexacyanoferrate(III)

C Carbon dioxide

D Calcium oxide

Correct Answer: B. Potassium hexacyanoferrate(III)

Explanation:

Potassium hexacyanoferrate(III) contains both ionic bonds (between K⁺ and the [Fe(CN)₆]³⁻ complex) and covalent bonds (between Fe and CN ligands, and within the CN groups).

This complex salt is extensively used in coordination chemistry and analytical procedures like the Prussian blue test.

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Q.2 Hard Chemistry

Which of the following substances will have the lowest lattice enthalpy among ionic compounds?

A NaCl

B MgO

C CsI

D CaF₂

Correct Answer: C. CsI

Explanation:

Lattice enthalpy depends inversely on ionic radius and directly on ionic charge.

CsI has the lowest lattice enthalpy (~604 kJ/mol) because both Cs⁺ and I⁻ are large ions with 1+ and 1- charges respectively.