Recent questions tagged ch-9

What is the hybridisation of central metal ion and shape of Wilkinson’s catalyst ?

asked Jan 30, 2017 by sharmaaparna1

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How $t_{2g}$ and eg orbitals are formed in an octahedral complex ?

asked Dec 28, 2016 by meena.p

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A, B and C are three complexes of Chromioum with the empirical formula $H_{12}O_{6}Cl_3Cr$. All the three complexes have $Cl$ and $H_2O$ molecules as the ligands. Complex A does not react with conc. $H_2SO_4$. Complexes $B$ and $C$ lose $6.75\%$ and $13.5\%$ of their original weight respectively on heating with conc. $H_2SO_4$. Identify A, B and C.

asked Dec 28, 2016 by meena.p

1 answer

$Fe^{3+} \longrightarrow (A) \quad \longrightarrow \quad (B)$ What are (A) and (B) ? Give IUPAC name of (A) . Find the Spin only magnetic moment of $(B)$

asked Nov 25, 2016 by meena.p

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What is the value of X in the complex $H_xCo(Co)_4$ on the basis of $EA N$ rule . $(At . No.CO=27)$

asked Nov 23, 2016 by meena.p

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Why is the silver plating of copper $k[Ag(CN)_2]$is used instead of $AgNO_3$ ?

asked Nov 22, 2016 by meena.p

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Calculate the overall complex dissociation equilibrium constant for the $Cu(NH_3) _4^{2+}$ ion given that $B_4$ for this complex is $2:1 \times 10^{13}$

asked Nov 17, 2016 by meena.p

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State a reason for each of the following solutions : (i) $CO^{2+}$ is easily oxidized to $CO^{3+}$ in the presence of a strong ligand (ii) $CO$ is a stronger complexing regent than $NH_3$ (iii) The molecular shape of $Ni(CO)_4$ is not the same as that of $[Ni(CN)_4]^{2-}$

asked Nov 16, 2016 by meena.p

1 answer

Arrange following complex ions in increasing order of crystal field splitting energy $(\Delta _0)$: $[Cr(Cl)_6]^{3-},[Cr(CN)_6]^3,[Cr(NH_3)_6]^{3+}$

asked Nov 8, 2016 by meena.p

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How do size of particles of absorbent , pressure of gas and prevailing temperature enfluence the extent of absorption of a gas on a solid ?

asked Nov 7, 2016 by meena.p

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Which compound is used to estimate the hardness of water volumetrically?

asked Nov 4, 2016 by meena.p

2 answers

$CuSO_4.5H_2O$ is blue in colour while $CuSO_4$ is colourless . why ?

asked Nov 3, 2016 by meena.p

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What do you understand by denticity of ligand ?

asked Nov 2, 2016 by meena.p

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What is the coordination number of each type of ions in a rock salt type crystal structure ?

asked Oct 31, 2016 by meena.p

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What are common types of secondary structure of proteins ?

asked Oct 31, 2016 by meena.p

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(i) Why do compounds having similar geometry have different magnetic moment ? (ii)$FeSO_4$ solution mixed with $(NH_4)_2SO_4$ solution in 1 : 1 molar ratio gives the test of $Fe^{2+}$ ion but $CuSO_4$ solution mixed with aqueous ammonia in 1 : 4 molar ratio does not give the test of $Cu^{2+}$ ion. Explain why ?

asked Oct 27, 2016 by meena.p

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Do we call metal carbonyls as organometallics ? Why or why not ?

asked Oct 25, 2016 by meena.p

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Draw the structure of $BrF_3$ molecule

asked Oct 24, 2016 by meena.p

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Out of $H_2O$ and $H_2S$ which one has higher, bond angle ?

asked Oct 21, 2016 by meena.p

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Write the IUPAC name of $(i) [Fe(CN)_6]^{3-} \\ (ii) [CoCl_2(en)_2]Cl$

asked Oct 21, 2016 by meena.p

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Describe a chemical test in each case to distinguish between the following pairs of compounds. (a) Aniline and N-ethyl aniline (b) N- methyl propane -2 amine and N-ethyl methyl ethanamine

asked Oct 20, 2016 by meena.p

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How can you separate a mixture of primary , secondary and tertiary amines ? Write chemical reactions involved in the process .

asked Oct 17, 2016 by meena.p

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Why does a convex lens of glass $\mu = 1.5 $ behave as a diverging lens when immersed in carbon sulfide of $\mu= 1.65$?

asked May 25, 2016 by meena.p

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A magician during a show makes a glass lens $\mu = 1.5 $ disappears in a trough of liquid . What is the refractive index of the liquid ? Is the liquid water ?

asked May 25, 2016 by meena.p

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The sun (diameter d ) subtends an angle $\theta$ radian at the pole of a concave mirror of focal length f. What is the diameter of the image of the sun formed by the mirror ?

asked May 25, 2016 by meena.p

1 answer

A ray of light is incident at an angle of $60^{\circ}$ on a horizontal plane mirror. Through what angle should the mirror be titled to make the reflected ray horizontal ?

asked May 25, 2016 by meena.p

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What focal length should the reading spectacles have for a person whose near point is 50 cm ?

asked May 25, 2016 by meena.p

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One face of a prism is silvered and if refracting angle $30^{\circ}$ and refracting index 1.414 is silvered . At what angle must a ray of light fall on the silvered surface so that after refraction into prism and reflection at the silvered surface it retrace the path ?

asked May 25, 2016 by meena.p

1 answer

A convex and concave mirror each of radius 10 cm are placed facing each other and 15 cm apart. A point object is placed midway between them . Find the position of the final image if the reflection takes place at the concave mirror and then at the convex mirror .

asked May 25, 2016 by meena.p

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A point source kept at a distance of 1000 m has an illumination I. To change the illumination to 16 I the new distance should be

asked May 25, 2016 by meena.p

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Magnification power of an astronomical telescope for normal vision with usual notation is

asked May 25, 2016 by meena.p

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An eye specialist prescribe spectacles having combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm . The power of this lens combination , in dioptre.

asked May 25, 2016 by meena.p

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A source exits sound of frequency 600 Hz inside water. The frequency heard in air (velocity of sound in water 1500 m/s velocity of sand in air 300 m/s) will be

asked May 25, 2016 by meena.p

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A substance has a critical angle of $45^{\circ}$ for yellow light. What is its refractive index ?

asked May 25, 2016 by meena.p

1 answer

A thin convex lens of focal length 25 cm is cut into two pieces 0.5 cm above the principal axis . The top part is placed at $(0,0) $ and an object at $(-50 cm, 0)$. Find the coordinate axis ?

asked May 25, 2016 by meena.p

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For a glass prism $(\mu=\sqrt 3)$ the angle of minimum deviation is equal to the angle of the prism . Find the angle of the prism .

asked May 25, 2016 by meena.p

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The immiscible liquids of densities $d_1 > d_2 > d_3$ and refractive indices $\mu_1 > \mu_2 > \mu_3$ are put in a beaker . The height of each liquid column is $\large\frac{h}{3}$. A dot is made at the bottom of the beaker . For near normal vision, find the apparent depth of the dot .

asked May 25, 2016 by meena.p

1 answer

An unsymmetrical double convex thin lens, forms the image of a point object on its axis will the position of the image change in the lens is reversed ?

asked May 25, 2016 by meena.p

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The near vision of an average person is 25 cm . To view an object with an angular magnification of 10, What should be the power of the microscope ?

asked May 25, 2016 by meena.p

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Will the focus length of a lens for red light be more , same or less than that for blue light ?

asked May 24, 2016 by meena.p

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An astronomical refractive telescope has an objective of focal length 20 m and eye piece of focal length 2 cm

asked May 24, 2016 by meena.p

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A car is moving with a constant speed of 60 km/hr on a straight road. Looking at the rear view mirror the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km/hr. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car, after every 2s till the other car overtakes. If the two cars maintaining the speed , which of the following statement is /are correct ?

asked May 24, 2016 by meena.p

1 answer

The optical density of turpentine is higher than that water , while its mass density is lower a layer a tuperline floating over water in a container . For which one of the four rays incident on turpentine the path shown is correct ?

asked May 24, 2016 by meena.p

1 answer

The direction of ray of light incident on a concave mirror by PQ while direction in which the ray would travel after reflection four ray marked 1,2,3 and 4 . Which of the four rays correctly shown the direction of reflected ray ?

asked May 24, 2016 by meena.p

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The phenomenon involved in the reflection of radio- waves by ionosphere is similar to

asked May 24, 2016 by meena.p

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The radius of culvature of the curved surface of a plano - convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will

asked May 24, 2016 by meena.p

1 answer

You are given four sources of light each one providing a light of a single colour - red, blue , green , and yellow . Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is $90^{\circ}$ Which of the following statement is correct if the source of yellow light is replaced with that of other lights without changing the angle of incident ?

asked May 24, 2016 by meena.p

1 answer

A passenger in an aeroplane shall

asked May 24, 2016 by meena.p

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An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus . The image

asked May 24, 2016 by meena.p

1 answer

A short pulse of white light is incident from air to a glass at normal incident . After travelling through the slab, the first colour to emerge is

asked May 24, 2016 by meena.p

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