31.

In tetragonal crystal system, which of following is not true?

• All axial lengths and all axial angles are equal.

• All three axial lengths are equal.

• All three axial angles are equal.

• Two axial angles are equal but the third is different.

For a reaction X$\to$Y,the graph ofthe product concentration (x) versus time (t) came out to be a straight line passing through the origin. Hence the graph of $\frac{-\mathrm{d}\left[\mathrm{X}\right]}{\mathrm{dt}}$ and time would be

• straight line with a negative slope and an intercept on y-axis

• straight line with a positive slope and an intercept on y-axis

• a straight line parallel to x-axis

• a hyperbola.

A factory produces 40 kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50%?

• 22 kg

• 18 kg

• 9 kg

• 27 kg

Match list I with list II and select the correct answer using the codes given below the lists.

• A-1, B-3, C-5, D-4

• A-2, B-3,C-5,D-1

• A-4, B-3, C-5, D-1

• A-4, B-5, C-3, D-1

A complex PtCl₄.5NH₃, shows a molar conductance of 402 ohm^-1 cm²mol^-1 in water and precipitates three moles ofAgCl with AgNO₃ solution. The formula of the complex is

• [Pt(NH₃)₆]Cl₄

• [Pt(NH₃)₄Cl₂]Cl₂

• [Pt(NH₃)₅Cl]Cl₃

• [Pt(NH₃)₃Cl₃]Cl

Calculate ${\wedge }_{\mathrm{HOAC}}^{\infty }$ using appropriate molar conductances of the electrolytes listed above at infinite dilution in H₂O at 25°C.

• 517.2

• 552.7

• 390.7

• 217.5

The phosphate of a metal has the formula MHPO₄. The formula of its chloride would be

• MCl

• MCl₂

• MCl₃

• M₂Cl₃

The shape and hybridisation of some xenon oxyfluorides are given. Choose the wrong set.

• XeOF₂  - T-Shape-sp³d

• XeOF₄ - Square pyramidal-sp³d²

• XeO₂F₂ - Distorted trigonal bipyramidal-sp³d

• XeO₃F₂- Octahedral-sp³d

The standard half-cell reduction potential for Ag⁺| Ag is 0.7991 V at 25°C. Given the experimental value K_sp= 1.56 x 10^-10 for AgCl, calculate the standard half-cell reduction potential for the Ag | AgCl electrode.

• 0.2192V

• -0.2192V

• -1.2192 V

• 1.2192 V

For the electrochemical cell, M | M⁺ || X^- | X, ${\mathrm{E}}^{°}$(M⁺| M) = 0.44 V and ${\mathrm{E}}^{°}$(X | X^-) = 0.33 V. From this data one can deduce that

• M + X^- $\to$M^- + X^- is the spontateous reaction.

• M⁺ + X^- $\to$M + X is the spontaneous reaction.

• E_cell = 0.77 V

• E_cell = -0.77V