Explanation

In NaCl, each sodium ion (Na⁺) is surrounded by six chloride ions (Cl⁻) in a cubic close-packed structure.

Therefore, the coordination number of Na in NaCl is 6.

Explanation

In solids, particles mainly exhibit vibrational motion about their fixed positions.

They have limited translational and rotational motion compared to liquids and gases.

Explanation

Homogeneous liquid equilibria can be affected by temperature changes,

It as the temperature can influence the equilibrium position.

Pressure changes may also affect equilibria but to a lesser extent than temperature changes.

Explanation

The order of a reaction can be fractional, whereas molecularity (the number of molecules involved in the reaction)

It is always a whole number and cannot be fractional

Explanation

The Born-Haber cycle is used to calculate the lattice energy of an ionic compound,

which is the energy required to form the ionic lattice from its gaseous ions.

Explanation

Be(OH)₂ is an amphoteric hydroxide, meaning it can act as both an acid and a base.

Mg(OH)₂ and Ca(OH)₂ are basic hydroxides.

Explanation

The efficiency of a Carnot engine is given by 

Efficiency = 1 − 𝑄 rejected /𝑄 accepted

where  𝑄 accepted and  𝑄 rejected is the heat absorbed and rejected, respectively.

Explanation

 In an isothermal process, the temperature remains constant, so the internal energy of an ideal gas also remains constant.

Explanation

Polarization is a property of transverse waves, where the direction of vibration can be oriented in various directions.

Ultrasonic waves are longitudinal waves and cannot be polarized.

Explanation

The moment of inertia depends on the mass of the object,

how the mass is distributed relative to the axis of rotation,

and the axis of rotation itself,

but it does not depend on the angular velocity.