Class 12th

Which of the following reduction methods is correctly matched against the given metals (commercial process)?

Hydrolysis of sucrose into (+) glucose and (-) fructose is known as-

Select the CORRECT statements?

(i) $\left[Zn{(gly)}_2\right]$  is optically active compound

(ii) ${\left[PdClBr\left(gly\right)\right]}^{\Theta }$  exhibits geometrical isomerism

(iii) ${\left[IrB{r}_4\left(en\right)\right]}^{\Theta }$  exhibits cis trans isomerism        

(iv) ${\left[RhC{l}_2{\left(N{H}_3\right)}_4\right]}^{+}$  number of stereo isomers is equal to number of geometrical isomers

Kindly consider the following figure

N-Ethyl pthalimide on hydrolysis gives-

What is the apparent molecular mass (in gm/mol) of a weak acid, HA (molar mass = 30.0 gm/mol) in an aqueous solution, which shows elevation in boiling point by $0.0156°C?$  

[Given: pK_a (HA) = 2.0, K_b (H₂O) = 0.52 K kg mol^-1]

Hydrogenation of the above compound in the presence of poisoned palladium catalyst gives

In gravity free space, a bead of charge $1\mu C$ and mass 3mg is threaded on a rough rod of friction coefficient $\mu$ = 0.3. A magnetic field of magnitude 0.2 T exists perpendicular to the rod. The bead is projected along the rod with a speed 4m/s. How much distance (in m) will the bead cover before coming to rest?

You are given a converging lens with equal radii of curvature and a diverging lens with the same radii of curvature as those of the converging lens. The lenses are made of material with n = 1.50, the radii of curvature are all 35cm. They are placed at opposite ends of a tube 15cm long, and the nearer lens which is converging is 10cm from an object. What is the location of the image that results from the two refractions? Write the final distance (in cm) from diverging lens.

An electron moves in the field produced by a charged sphere of radius 10cm along the radius connecting the points separated by 12 and 15 cm from the centre of the sphere. The velocity of the electron changes thereby from 2 * 10⁵ to 2 * 10⁶ m/s. Determine the surface charge (in nC/m²) density of the sphere. (Mass of electron = 9.1 * 10^-31kg)