Question

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Answer 1

Answer:

1. (i) Body-Centred Unit Cell:

It contains one constituent particle (atom, molecule or ion) at its body- centre and eight particles at its corners.

(ii) Face-Centred Unit Cell:

It contains one constituent particle present at the centre of each face, along with eight particles at its corners.

2. The face centered unit cell (FCC) contains atoms at all the corners of the crystal lattice and at the center of all the faces of the cube. ... The packing efficiency of FCC lattice is 74%.

3.Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electroreactions, hydrogen's standard electrode potential (E°) is declared to be zero volts at any temperature

4. Let R be the rate of reaction.

Let R be the rate of reaction.For first order reaction,

$r = k \: \: ({a}^{1} )$

$k = r \: \: ( {a}^{ - 1} )$

Whereas, K and [A] are rate constant and initial concentration of reactant respectively.

Therefore,

Unit of rate constant:-

${(mol \: \: {l}^{ - 1} )}^{1 - n \: } {sec}^{ - 1}$

For first order reaction,

n=1

n=1Unit of rate constant:-

$= > {sec}^{ - 1}$

Hence the unit of rate constant for first order reaction is sec−1.

5. 0.225 - 0.414

6. Magnetism without d-orbital electrons seems to be unrealistic; however, recent observationsof magnetism in non-magnetic oxides, such as ZnO, HfO2, and MgO, have opened new avenuesin the field of magnetism. Magnetism exhibited by these oxides is known as d◦ferromagnetism,as theseoxides either have completely filled or unfilled d-/f-orbitals. This magnetism is believed tooccur due to polarization induced by p-orbitals.

7. Zn^2 + (0.001 M) || Cu^2 + (0.1 M) | Cu The standard potential of Cu/Cu^2 + half - cell is + 0.34 and Zn/Zn^2 + is - 0.76 V.

8. The equilibrium constant for this reaction is called the ion-product constant of liquid water (Kw) and is defined as Kw=[H3O+][OH−]. At 25 °C, Kw is 1.01×10−14; hence pH+pOH=pKw=14.00.

9. This crystal structure is called the structure of cubic close-packed (ccp) or face-centered cubic (fcc). In each of them, since each sphere is in contact with twelve spheres, the coordination number is 12. In these kinds of close packing, 74% of the space in the crystal is packed

10. Hexagonal Crystal System:-

In the hexagonal crystal system we have a=b≠c and α=β=90∘,γ=120∘. In option C.), the triclinic crystal system all the lattice sites and all the bond angles are unequal. That is in the triclinic crystal system we have a≠b≠c and α≠β≠γ≠90∘. It is the most unsymmetrical crystal system.

Explanation:

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