94420 + Interview Questions in Chemistry in Class 12

1.	The colour of Mohr's salt, (NH_4)_2SO_4 Fe(SO_4).6H_2O is :
Answer» WHITE GREEN Violet Blue Answer :B

Discussion

2.	The colour of liquid O_(2)is __________.
Answer» Red DARK BLUE PALE yellow Pale blue Solution :The colour of LIQUID `O_(2)` is pale blue.

Discussion

3.	The colour of light absorbed by an aqueous solution of CuSO_(4) is….
Answer» Orange-red Blue-green Yellow Violet Answer :A

Discussion

4.	The colour of lead chromate is :
Answer» Red Yellow White Black Answer :B

Discussion

5.	The colour of lanthoanoids and actinoids is dueto :
Answer» s-f TRANSITIONS p-f transitions d-f TRANSTITION f-f transitions. ANSWER :D

Discussion

6.	The colour of KMnO_(4) is due to
Answer» `L RARR M` charge TRANSFER transition `sigma-sigma^(**)` transition `M rarrL` charge transfer transition d-d transition Solution :The deep purplecolour of `KMnO_(4)` is not due tod-d transition but due to charge transfer from Oto Mn, i.e., from Ligand (L) to Metal (M)which reduces the oxidation STATE of Mn from `+7` to `+6` MOMENTARILY.

Discussion

7.	The colour of KMnO_(4) is due to…..
Answer» `L RARR M` CHARGE TRANSFER transition `SIGMA rarr sigma^(**)` Transition `M rarr L` charge transfer transition d-d transition Answer :A

Discussion

8.	The colour of K_2Cr_2O_7 changes from redorange to lemon yellow on treatment with KOH(aq.) because of :
Answer» Reduction of CR (vi) to Cr (III) Formation of DICHROMATE hydroxide Conversion of dichromate into chromate ion Oxidation of potassium hydroxide ot potassium peroxide Answer :C

Discussion

9.	ThecolourOf k_(2)Cr_(2)O_(7)and Fe^(2+)ions arerespectivelydue to
Answer» Crystaldefects andchargtransferspectra d-dtransition and chargetransferspectra Chargetransferspectraand crystaldefects Chargetransfer SPECTRA and d-dtransition ANSWER :D

Discussion

10.	The colour of I_2 is violet because it:
Answer» ABSORBS VIOLET light Does not absorb light Absorbs YELLOW and GREEN light None Answer :C

Discussion

11.	The colour of FeF_3 is
Answer» BROWN RED brown Lighg green white Solution :`FeF_3` is brown

Discussion

12.	The colour of FeSO_4.(NH_4)_2SO_4 6H_2O is:
Answer» Red White Green Blue Answer :C

Discussion

13.	The colour of FeF_3 is:
Answer» Brown Red brown Light green White Answer :D

Discussion

14.	The colour of CuCr_(2)O_(7) solutioin is water is green because
Answer» `Cr_(2)O_(7)^(2-)` IONS are GREEN `Cu^(++)` ions are green Both ions are green `Cu^(++)` ions are blue and `Cr_(2)O_(7)^(2-)` ions are yellow Solution :`Cu^(++)` ions are blue and `Cr_(2)O_(7)^(-)` ions are yellow, yellow and blue COMBINATION gives-green colour.

Discussion

15.	The colour of copper sulphide is :
Answer» black BLUE BROWN red. Solution :CuSobtainedas ppt. with `H_2S` is black . `Cu^(2+) + H_2S to UNDERSET("Black")(CuS) + 2H^(+)`

Discussion

16.	The colour of d-block elements is due to :
Answer» <P>ND-(n + 1)s transition nd-(n+1)p transition nd-nd transition nd-(n+1)d transition. Answer :C

Discussion

17.	The colour of [Cr(H_(2)O)_(6)]^(3+) is….
Answer» Violet Green Blue Colourless Answer :A

Discussion

18.	The colour of Co(H_(2)O)_(6)^(2+) is best attributed to electronic transitions :
Answer» between different n levels in the METAL. between the metal's d orbitals. from the `CO^(2+)` ion to water molecules. during ionization. Answer :B

Discussion

19.	The colourof CoCl_(3).5NH_(3).H_(2)O is
Answer» ORANGE yellow Orange Green Pink Solution :`CoCl_(3).5NH_(3).H_(2)O` is pink in COLOUR

Discussion

20.	The colour of CoCl_(3).5NH_(3).H_(2)O is
Answer» ORANGE yellow Orange GREEN VIOLET Solution :The colour of the COMPLEX `COCl_(3).5NH_(3).H_(2)O` is pink.

Discussion

21.	The colour of an electrolytesolution depends on
Answer» The NATURE of the anion The nature of the cation The nature of both the ions The nature of the solvent Solution :Colour of electrolyte DEPENDS on the nature of both ions. e.g. `CuSO_(4)` is blue because `CU^(2+)` ions are blue.

Discussion

22.	The colour of blue glass is due to the presence of the oxide of :
Answer» Cr Ni Co Fe Answer :C

Discussion

23.	The colour in the coordination compounds can be readily explained in terms of crystal field theory. Consider, for example, the complex [Ti(H_(2)O)_(6)]^(3+), which is violet in colour. This is an octahedral complex where the single electron [Ti^(3+) is a 3d^(1) system] in the metal d-orbital is in the t_(2g) level in the ground state of the complex. The next higher state available for the electron is the empty e_(g) level. If light corresponding to the energy of blue-green region is absorbed by the complex, it would excite the electron from t_(2g) level to the e_(g) level (t_(2g)^(1)e_(g)^(0)to t_(2g)^(0)e_(g)^(1)). Consequently, the complex appears violet in colour. The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron. It is important to note that in the absence of ligand, crystal field splitting does not occur and hence the substance in colourless. For example, removal of water from [Ti(H_(2)O)_(6)]Cl_(3) on heating renders it colourless. Similarly, anhydrous CuSO_(4) is white, but CuSO_(4).5H_(2)O is blue in colour. What will happen to [Ti(H_(2)O)_(6)]Cl_(3) on heating ?
Answer» Solution :It will become colourless because `H_(2)O` molecules which ACT as ligands are REMOVED on HEATING.

Discussion

24.	The colour in the coordination compounds can be readily explained in terms of crystal field theory. Consider, for example, the complex [Ti(H_(2)O)_(6)]^(3+), which is violet in colour. This is an octahedral complex where the single electron [Ti^(3+) is a 3d^(1) system] in the metal d-orbital is in the t_(2g) level in the ground state of the complex. The next higher state available for the electron is the empty e_(g) level. If light corresponding to the energy of blue-green region is absorbed by the complex, it would excite the electron from t_(2g) level to the e_(g) level (t_(2g)^(1)e_(g)^(0)to t_(2g)^(0)e_(g)^(1)). Consequently, the complex appears violet in colour. The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron. It is important to note that in the absence of ligand, crystal field splitting does not occur and hence the substance in colourless. For example, removal of water from [Ti(H_(2)O)_(6)]Cl_(3) on heating renders it colourless. Similarly, anhydrous CuSO_(4) is white, but CuSO_(4).5H_(2)O is blue in colour. Which theory explains the colour of coordination compounds ?
Answer» Solution :CRYSTAL field theory explains the COLOUR of COORDINATION COMPOUNDS.

Discussion

25.	The colour in the coordination compounds can be readily explained in terms of crystal field theory. Consider, for example, the complex [Ti(H_(2)O)_(6)]^(3+), which is violet in colour. This is an octahedral complex where the single electron [Ti^(3+) is a 3d^(1) system] in the metal d-orbital is in the t_(2g) level in the ground state of the complex. The next higher state available for the electron is the empty e_(g) level. If light corresponding to the energy of blue-green region is absorbed by the complex, it would excite the electron from t_(2g) level to the e_(g) level (t_(2g)^(1)e_(g)^(0)to t_(2g)^(0)e_(g)^(1)). Consequently, the complex appears violet in colour. The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron. It is important to note that in the absence of ligand, crystal field splitting does not occur and hence the substance in colourless. For example, removal of water from [Ti(H_(2)O)_(6)]Cl_(3) on heating renders it colourless. Similarly, anhydrous CuSO_(4) is white, but CuSO_(4).5H_(2)O is blue in colour. Why is anhydrous CuSO_(4) white but CuSO_(4) dissolved in water gives a blue solution ?
Answer» Solution :In the absence of WATER (ligands), there is no splitting and no excitation of electrons. HENCE it is WHITE. When dissolved in water, they act as ligands, splitting of ORBITALS takes PLACE and excitation of electrons takes place and colour is produced.

Discussion

26.	The colour in the coordination compounds can be readily explained in terms of crystal field theory. Consider, for example, the complex [Ti(H_(2)O)_(6)]^(3+), which is violet in colour. This is an octahedral complex where the single electron [Ti^(3+) is a 3d^(1) system] in the metal d-orbital is in the t_(2g) level in the ground state of the complex. The next higher state available for the electron is the empty e_(g) level. If light corresponding to the energy of blue-green region is absorbed by the complex, it would excite the electron from t_(2g) level to the e_(g) level (t_(2g)^(1)e_(g)^(0)to t_(2g)^(0)e_(g)^(1)). Consequently, the complex appears violet in colour. The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron. It is important to note that in the absence of ligand, crystal field splitting does not occur and hence the substance in colourless. For example, removal of water from [Ti(H_(2)O)_(6)]Cl_(3) on heating renders it colourless. Similarly, anhydrous CuSO_(4) is white, but CuSO_(4).5H_(2)O is blue in colour. Out of the t_(2g) and e_(g) d-orbitals, which has a higher energy?
Answer» SOLUTION :`e_(g)` ORBITALS have higher ENERGY.

Discussion

27.	The colour in the coordination compounds can be readily explained in terms of crystal field theory. Consider, for example, the complex [Ti(H_(2)O)_(6)]^(3+), which is violet in colour. This is an octahedral complex where the single electron [Ti^(3+) is a 3d^(1) system] in the metal d-orbital is in the t_(2g) level in the ground state of the complex. The next higher state available for the electron is the empty e_(g) level. If light corresponding to the energy of blue-green region is absorbed by the complex, it would excite the electron from t_(2g) level to the e_(g) level (t_(2g)^(1)e_(g)^(0)to t_(2g)^(0)e_(g)^(1)). Consequently, the complex appears violet in colour. The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron. It is important to note that in the absence of ligand, crystal field splitting does not occur and hence the substance in colourless. For example, removal of water from [Ti(H_(2)O)_(6)]Cl_(3) on heating renders it colourless. Similarly, anhydrous CuSO_(4) is white, but CuSO_(4).5H_(2)O is blue in colour. Show diagrammatically the excitation of electron in the coordination compound [Ti(H_(2)O)_(6)]^(3+).
Answer» SOLUTION :

Discussion

28.	The colour imparted by excess potassium in KCI crystal is͟͟͟͟͟͟͟͟
Answer» ANSWER :VIOLET(or LILAC)

Discussion

29.	The colour given to the flame by sodium salts is
Answer» LIGHT RED GOLDEN yellow Green pink ANSWER :B

Discussion

30.	The colour given to the flame by sodium salt is
Answer» Violet Green Blue Golden yellow Answer :D

Discussion

31.	The colour exhibited by one of the iron ions in aqueous solutions is pale green. The primary valency and secondary valency respectively in the green complex are
Answer» 2,4 2,6 3,4 3,6 Answer :B

Discussion

32.	Thecolour developedwhensodiumsulphide is added to sodium nitroprusside is
Answer» VIOLET yellow Red Black Solution :`N_(2)S + Na[Fe(CN)_92)NO] rarr underset(("Violet"))(Na_(4)[Fe(CN)_(5)NOS])`

Discussion

33.	The colour developedwhen Na_(2)S is added to Na_(2)[Fe(CN)_(5)(NO)] is,
Answer» Violet Yellow Red Black Solution :NA

Discussion

34.	The colour chage observed when excess ethyne is passed through the solution of bromine water is
Answer» COLOURLESS to REDDISH BROWN Colourless to green reddish brown to colourless Pink to colourless Answer :C

Discussion

35.	The color of KMnO_(4) is due to :
Answer» `M to L` charge transfer d-d transition `L to M` charge transfer transition `SIGMA -sigma^(*)` transition. Solution :The colour of `KMnO_(4)` is DUE to charge transfer spectra from lilgand (L) to metal (M) i.e. `L to M` charge transfer spectra.

Discussion

36.	The colloidal system sonsisting of a liquid adsorbate in a solid adsorbent is termed as:
Answer» AERSOL foam emulsion gel Answer :D

Discussion

37.	The colloiidal dispresion of a liquid in another liquid is called…………and the substance added to stabilized it is called…………
Answer» SOLUTION :EMULSION, EMULSIFIER

Discussion

38.	The colour and magnetic nature of manganate ion (MnO_(4)^(2-)) is
Answer» green, process PURPLE, diamagnetic green, diamagnetic purple, paramagnetic SOLUTION :`MnO_(4)^(2-)` green and paramagnetic, because it has one UNPAIRED electron.

Discussion

39.	The colloidal system in which the disperse phase and dispersion medium are both liquids is known
Answer» a gel an aerosol an EMULSION a FOAM. ANSWER :C

Discussion

40.	The colloidal system consisting of a liquid adsorbete in a solid adsorbent is termed as:
Answer» AEROSOL FOAM EMULSION GEL ANSWER :D

Discussion

41.	The colloidal system in which the disperse phase and dispersion medium are both liquids is known as :
Answer» a gel an aerosol an emulsion a foam Answer :C

Discussion

42.	The colloidal suspension of milky rubber with water is called .......................
Answer» LATEX emulsion vulcanized RUBBER NATURAL rubber SOLUTION :latex

Discussion

43.	Colloids are purified by
Answer» Peptisation Coagulation Dialysis Flocculation Answer :C

Discussion

44.	The colloidal gold is obtained by .........
Answer» peptisation bredig's ARC METHOD mechanical dispersion none of these SOLUTION :bredig.s arc method

Discussion

45.	The colloidal sol of cellulose nitrate in ethyl alcohol is called………….
Answer» SOLUTION :COLLODION

Discussion

46.	The colloid used for stomach disorder is_______.
Answer» COLLOIDAL silver colloidal antimony colloidal GOLD MILK of magnesia Answer :D

Discussion

47.	The colligative property of a sol compared to the aqueous solution of glucose of same concentration will be:
Answer» MUCH smaller much higher the same slighty lower Answer :A

Discussion

48.	The colligative properties of a solution are
Answer» `prop` molality `prop (1)/("MOLECULAR MASS of the SOLUTE")` PROPORTIONAL to each other independent of the nature of the solute, i.e., electrolyte or non-electrolyte. Answer :A::B::C

Discussion

49.	The colligative properties of a solution depend on :
Answer» NUMBER of SOLUTE PARTICLES PRESENT in it Chemical nature of the solute particles present in it Nature of the SOLVENT used None Answer :A

Discussion

50.	The colligative properties of a dilute solution depend on
Answer» the NATURE of the SOLUTE the nature of the solute and the solvent the NUMBER of PARTICLES of solute the number of particles of solvent. Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The colour of Mohr's salt, (NH_4)_2SO_4 Fe(SO_4).6H_2O is :

The colour of liquid O_(2)is __________.

The colour of light absorbed by an aqueous solution of CuSO_(4) is….

The colour of lead chromate is :

The colour of lanthoanoids and actinoids is dueto :

The colour of KMnO_(4) is due to

The colour of KMnO_(4) is due to…..

The colour of K_2Cr_2O_7 changes from redorange to lemon yellow on treatment with KOH(aq.) because of :

ThecolourOf k_(2)Cr_(2)O_(7)and Fe^(2+)ions arerespectivelydue to

The colour of I_2 is violet because it:

The colour of FeF_3 is

The colour of FeSO_4.(NH_4)_2SO_4 6H_2O is:

The colour of FeF_3 is:

The colour of CuCr_(2)O_(7) solutioin is water is green because

The colour of copper sulphide is :

The colour of d-block elements is due to :

The colour of [Cr(H_(2)O)_(6)]^(3+) is….

The colour of Co(H_(2)O)_(6)^(2+) is best attributed to electronic transitions :

The colourof CoCl_(3).5NH_(3).H_(2)O is

The colour of CoCl_(3).5NH_(3).H_(2)O is

The colour of an electrolytesolution depends on

The colour of blue glass is due to the presence of the oxide of :

The colour imparted by excess potassium in KCI crystal is͟͟͟͟͟͟͟͟

The colour given to the flame by sodium salts is

The colour given to the flame by sodium salt is

The colour exhibited by one of the iron ions in aqueous solutions is pale green. The primary valency and secondary valency respectively in the green complex are

Thecolour developedwhensodiumsulphide is added to sodium nitroprusside is

The colour developedwhen Na_(2)S is added to Na_(2)[Fe(CN)_(5)(NO)] is,

The colour chage observed when excess ethyne is passed through the solution of bromine water is

The color of KMnO_(4) is due to :

The colloidal system sonsisting of a liquid adsorbate in a solid adsorbent is termed as:

The colloiidal dispresion of a liquid in another liquid is called…………and the substance added to stabilized it is called…………

The colour and magnetic nature of manganate ion (MnO_(4)^(2-)) is

The colloidal system in which the disperse phase and dispersion medium are both liquids is known

The colloidal system consisting of a liquid adsorbete in a solid adsorbent is termed as:

The colloidal system in which the disperse phase and dispersion medium are both liquids is known as :

The colloidal suspension of milky rubber with water is called .......................

Colloids are purified by

The colloidal gold is obtained by .........

The colloidal sol of cellulose nitrate in ethyl alcohol is called………….

The colloid used for stomach disorder is_______.

The colligative property of a sol compared to the aqueous solution of glucose of same concentration will be:

The colligative properties of a solution are

The colligative properties of a solution depend on :

The colligative properties of a dilute solution depend on