11.

The alloy used in the contruction of aircrafts is :

• Mg-Al

• Mg-Mn

• Mg-Zn

• Mg-Sn

The principle of Column Chromatography is

• Capillary action

• Differential absorption of the substances on the solid phase

• Differential absorption of the substances on the phase

• Gravation force

The regions of the atmosphere , Where clouds form where we live repectively, are

• Troposphere and stratosphere

• Stratosphere and Troposphere

• Stratosphere and Stratosphere

• Troposphere and Troposphere

A gas undergoes physical adsorption on a surface and follows the given freundlich adsorption isotherm equation $\frac{\mathrm{x}}{\mathrm{m}}= {\mathrm{kp}}^{0.5}$. Adosrption of the gas increases with:

• increase in P and decrease in T

• Decrease in P and decrease in T

• Increase in P and Increase in T

• Decrease in P and Increase in T

A bacterial infection in an initial wound grows N₀(t) = N₀ exp(t), here the time t is in hours A dose of antibiotic, taken orally , needs 1 hour to reach the wound. Once it reaches there , the bacterial Population goes down as $\frac{\mathrm{dN}}{\mathrm{dt}}= -5{\mathrm{NH}}^2$ . what will be plot of $\frac{{\mathrm{N}}_0}{\mathrm{N}}\mathrm{Vs} \mathrm{t} \mathrm{after} 1 \mathrm{hour}$

The species that can have a trams-isomer (en=ethane-1,2-diamine,ox=oxalate)

• [Cr(en)₂(ox)]⁺

• [Pr(en)₂Cl₂]²⁺

• [Zn(en)Cl₂]

• [Pt(en)Cl₂]

Consider the hydrated ions of Ti²⁺,v²⁺, Ti³⁺ and Sc³⁺ The correct order of their spin only magnetic moments is :

• Ti³⁺ < Ti²⁺< Sc³⁺< V²⁺

• Vi²⁺ <Ti²⁺< Ti³⁺ < Sc³⁺

• Sc³⁺< Ti³⁺< Ti²⁺<V²⁺

• Sc³⁺< Ti³⁺< V²⁺< Ti²⁺

Three complex [CoCl(NH₃)₅]²⁺ (I)[Co(NH₃)₅H₂O]³⁺(II) and [Co(NH₃)₆]³⁺(III) absorb light in the visible region . the correct order of the wavelength of light absorbed by them is :

• II > I > III

• III > I > II

• I> II> III

• III> II> I

The oxoacid of sulphur that does not contain bond between sulphur atoms is :

• H₂S₂O₃

• H₂S₂O₇

• H₂S₄O₆

• H₂S₂O₄

At room temperature a dilute solution of urea is prepared by dissolving 0.60g of urea in 360g of water . If the vapour pressure of pure water at this temperature is 35mmHg , Lowering of vapour pressure will be (molar mass of urea =60g mol^-1).

• 0.28mmHg

• 0.031 mmHg

• 0.027Hg

• 0.017mmHg