Recent questions tagged ch-10

Drugs containing carboxylic Acid organic acids characterized by the presence of at least one carboxylic group. The general formula of a carboxylic acid is $R-COOH$. The carboxylic acids find a use in the manufacture of many useful drugs.one Such important drug is aspirin Answer the following (i) What is the IUPAC name of the drugs ? Name the functional groups present in the drug . (ii) Can the drug be prepared in the lab ? (iii) A person goes to the shop keeper to get aspirin pills without doctors presoription . The chemist is reluctant to give him pills with out doctor's prescription . (iv) Which values are reflected in chemists approach ?

asked Nov 28, 2016 by meena.p

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How would you account for the following $NF_3$ is an exothermic compounds but $NCl_3$ is not.

asked Nov 22, 2016 by meena.p

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Give reasons— (a) Interhalogen compounds are more reactive than halogens (b) $PCl_5$ is known but $NCl_5$ is not known. (c) Amongst all noble gases, only xenon is known to form compounds with oxygen and fluorine.

asked Nov 16, 2016 by meena.p

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(i) Why Grignard reagents should be prepared under anhydrous conditions. (ii) Why $C_6H_5CHClCH_3$ is hydrolysed more easily with $KOH$ than $C_6H_5CH_2Cl$

asked Nov 15, 2016 by meena.p

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Answer the following : (i) Haloalkanes easily dissolve in organic solvent why ? (ii) What is known as a racemic mixture ? Give an example

asked Nov 14, 2016 by meena.p

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Why are pentahalides more covalent than trihalides ?

asked Nov 7, 2016 by meena.p

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Differentiate between chiral and achiral molecules :

asked Nov 3, 2016 by meena.p

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What happens when bromine reacts with $CH_3 - C = CH$? How would you justify this reaction ?

asked Oct 27, 2016 by meena.p

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How would you obtain (i) Picric acid (2,4,6- trinitrophenol) from phenol (ii) 2- Methyl propene from 2- Methyl propanol ?

asked Oct 26, 2016 by meena.p

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write the disproportionate reaction of that oxoacids of nitrogen in which nitrogen is in +3 oxidation state .

asked Oct 24, 2016 by meena.p

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The carbon - oxygen bond in phenol is slightly stronger than that in methanol . Why ?

asked Oct 17, 2016 by meena.p

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Alcohols act as weak bases . explain

asked Oct 14, 2016 by meena.p

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a)Give the mechanism of preparation of ethoxy ethane from ethanol b) Alcohols act as weak bases . explain .

asked Oct 13, 2016 by meena.p

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Two slits are 1 mm apart and the screen is placed 1 m away. What is the fringe separation when blue green light of wave length 500 nm is used ?

asked Jun 20, 2016 by meena.p

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Find the minimum thickness of a film which will strongly reflected the light of wavelength $589\;nm$ The refractive index of the material of the film is $1.25$

asked Jun 20, 2016 by meena.p

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The diameter of the pupil of human eye is about $2mm$. Human eye is the most sensitive to the wave length $555\;nm$ Find the limit of resolution of human eye.

asked Jun 20, 2016 by meena.p

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With what speed should a galaxy move with respect to us so that the sodium line at $589.0\;nm$ is observed at $589.6 \;nm? $

asked Jun 20, 2016 by meena.p

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Unpolarized light incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted and refracted ray are perpendicular to each other ? $(\mu =1.5)$

asked Jun 20, 2016 by meena.p

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The refractive index of a medium is $ \sqrt 3$ What is the angle of refraction , if the un polarized light is incident on it at the polarizing angle of the medium

asked Jun 20, 2016 by meena.p

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A beam of light consisting of wave length 650 nm and 520 nm, is used to obtain interference finger in a Young's double slit experiment . Find the distance of the third bright fringe on the screen from the central maximum for wave length 650 nm

asked Jun 20, 2016 by meena.p

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The $6563 A^{\circ}\; H _{\alpha}$ line emitted by hydrogen in a star is found to be red shifted by $15^{\circ}A$ Estimate the speed with which the star is receding from the earth .

asked Jun 20, 2016 by meena.p

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Two towers on the top of two hills are 40 km apart . The line joining then passes 50 m above a hill way between the towers . What is the longest wave length of radio waves which can be sent between the towers with out appreciable diffraction effects ?

asked Jun 20, 2016 by meena.p

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Yellow light is used in a single slit diffraction experiment is used in a single slit diffraction experiment with slit width $0.6\;mm$ . If yellow light is replaced by x- rays, then the observed pattern will reveal

asked Jun 20, 2016 by meena.p

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In a double slit experiment , the distance between slits is increased ten times where as their distance from screen is halved , then what is the fringe width ?

asked Jun 20, 2016 by meena.p

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A layer beam is used for locating distant object because

asked Jun 20, 2016 by meena.p

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Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is $ \large\frac{3}{2}$ is

asked Jun 20, 2016 by meena.p

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X- rays cannot be diffracted by means of ordinary grating because of ,

asked Jun 20, 2016 by meena.p

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For an aperture of size 'a' illuminated by a parallel beam of light having wavelength $\lambda$ , the Fresnel distance is

asked Jun 20, 2016 by meena.p

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Resolving power of telescope can be increased by increasing

asked Jun 20, 2016 by meena.p

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Two waves have intensity ratio $25:4$. what is the ratio of maximum to minimum intensity ?

asked Jun 20, 2016 by meena.p

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Diameter of human eyelens is 2 mm. What will be the minimum distance between two points to resolve , which is situated at a distance of 50 m from eye ? The wavelength of light is $5000 A^{\circ}$

asked Jun 20, 2016 by meena.p

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The angular resolution of a $10\; cm$ diameter telescope at a wavelength of $5000 A^{\circ}$ is of the order of

asked Jun 20, 2016 by meena.p

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A ray of light from a rarer medium strikes a denser medium as shown in the figure . The reflected and refracted rays make an angle of $90^{\circ}$ with each other . The angles of reflection and refraction are r and r' , the critical angle would be

asked Jun 20, 2016 by meena.p

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Which of the phenomenon is not common to sound and light wave :

asked Jun 20, 2016 by meena.p

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In a Fresnel bi prism experiment, the two position of lens, give separation between the slits as $16\;cm$ and $9\;cm$ respectively . What is the actual distance of separation?

asked Jun 20, 2016 by meena.p

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What is the pair difference for destructive interface ?

asked Jun 20, 2016 by meena.p

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A ray of light strikes a material slab at an angle of incident $60^{\circ}$ . If the reflected and refracted rays are perpendicular to each other, the refractive index of the material is

asked Jun 20, 2016 by meena.p

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Two coherent light beams of intercity I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are :

asked Jun 20, 2016 by meena.p

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The colours seen in the reflected white light form a thin oil flim due to

asked Jun 20, 2016 by meena.p

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Which among the following is a form of energy ?

asked Jun 20, 2016 by meena.p

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The initial shape of the wave front of the beam is

asked Jun 20, 2016 by meena.p

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The maximum no of possible interference maxima for slit separation equal to twice the wave length in Young's double slit experiment

asked Jun 20, 2016 by meena.p

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Wave length of light used in an optical instrument are $ \lambda_1=4000^{\circ}A$ and $ \lambda_2=5000^{\circ}A$ then ratio of their respective resolving power .(corresponding to $\lambda_1$ and $\lambda_2$) is

asked Jun 20, 2016 by meena.p

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The phase difference between two waves reaching a point is $ \frac{\pi}{2}$ . What is the resultant amplitude if the individual amplitude are 3 mm and 4 mm ?

asked Jun 17, 2016 by meena.p

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Two cohered source emit waves of amplitude a and 2a. They meet at a point P equidistant from the two sources. If the intensity of the first is I , what is the resultant intensity at point p?

asked Jun 17, 2016 by meena.p

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Two slits in younger double slit experiment have width in the ratio $81:1$ what is the ratio of the amplitudes of light waves from them ?

asked Jun 17, 2016 by meena.p

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Is the contract fringe bright or dark in young's double slit experiment ?

asked Jun 17, 2016 by meena.p

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What is Brewster's angle from air to glass transition ? ($\mu$ for glass is 1.5)?

asked Jun 17, 2016 by meena.p

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The refractive index of glass is 1.5 what is the speed of light in vaccum is $3.0 \times 10^8 \;ms^{-1}$

asked Jun 17, 2016 by meena.p

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Green light is incident at the polarizing angle of a certain glass plate . The angle of refraction is $32^{\circ}$ . What is the index of refraction of glass ?

asked Jun 17, 2016 by meena.p

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