94420 + Interview Questions in Chemistry in Class 12 Page 626 InterviewSolution

31251.	The cost of electricity required to deposit 1 g of Mg is Rs.3.00. The cost of deposit 8 g of Al is (al.mass Al = 27 , Mg = 24)
Answer» RS.`12.00` Rs. `24.00` Rs. `32.00` Rs.`42.50` SOLUTION :`(W_(Al))/(W_(Mg)) = (E_(Mg))/(E_(Al))` `therefore (W_(Al))/(1)= (24//2)/(27//3) = (12)/(9)` `therefore W_(Al) = (12)/(9)` gms. When 1 gm of Mg deposited at the same time , `(12)/(9)` gm of Al deposited by passing same quantity of ELECTRICITY For 1 gm Mg `-=` it cost three rupees `therefore (12)/(9) g Al -= x : x = (3 xx (12//9))/(1) = 4` rupees `therefore` For 8 gm of Al `-= 8 xx 4 = 32` rupees

Discussion

31252.	The cost of electricity required to deposit 1 g of Mg is Rs 3.00. The cost to deposit 8 g of Al is __________. )At. Mass Al = 27 , Mg = 24)
Answer» RS 12.00 Rs 24.00 Rs 32.00 Rs 42.50 Answer :C

Discussion

31253.	The cost at 5 paise/KWH of operating an electric motor for 8 hours which takes 15 amp at 110V is
Answer» RS 66 66 paise 37 paise Rs 6.60 Solution :`W = I.V`

Discussion

31254.	The corrrect relationship between K_c and K_p is gaseous equilibrium is:
Answer» `K_C = K_P (RT)^DELTAN (B)` `K_p = K_C (RT)^Deltan` `(k_c)/(RT) (K_P)^Deltan` (K_P)/(RT) = (K_C)^Deltan` ANSWER :B

Discussion

31255.	The corrosion of iron object is not favoured by
Answer» presence of `H^(+)` ION presence of moisture in AIR presence of impurities in iron object presence of VACUUM SOLUTION :Follow theory of corrosion .

Discussion

31256.	The corrosion of iron object is favoured by
Answer» PRESENCE of `H^(+)` ION Presence of MOISTURE of air Presence of impurities in iron object All of the above Answer :D

Discussion

31257.	The corrosion of iron object is favoured by:
Answer» PRESENCE of `H^+` ion Presence of MOISTURE in air Presence of imputities in IRON object All of these Answer :D

Discussion

31258.	The correctr statement regarding electrophile is-
Answer» electrophile is a NEGATIVELY charged species and can form a bond by accepting a pair of electrons from another electrophile electrophiles are generally neutral speices and can form a bond by accepting a pair of electrons from a nucleophile electrophiles can be EITHER neutral of postively charged speices and can from a bond by accepting a pair of electrons from a nucleophile electrophile is a negatively charged species and can form a bond accepting a pair of electrons from a nucleophile Solution :Electrophile may be neutral `(e.g.,NO_(2)^(oplus))`. They can TAKE ELECTRON from nucleophile to COMPLETE its ortet.

Discussion

31259.	The correct values of ionisation energies of Si, P, Cl and S are respectivey:
Answer» `786,1012,999,1256` 1012,786,99,1256 `786,1012,1256,999` `786,999,1012,1256` ANSWER :C

Discussion

31260.	The correct values of ionization enthalpies (in kJ "mol"^(-1)) of Si, P, Cl and S respectively are :-
Answer» 786, 1012, 999, 1256 1012, 786, 999, 1256 786, 1012, 1256, 999 786, 999, 1012, 1256 Solution :ORDER of IE `underset(3s^(2)3P^(2))(SI) lt underset(3s^(2)3p^(3))(P) lt underset(3s^(2)3p^(4))(S) lt underset(3s^(2)3p^(5))(Cl)` `underset(1256)(Cl) gt underset(1012)(P) gt underset(999)(S) gt underset(786)(Si)`

Discussion

31261.	The correct three dimensional presentation of ethane is
Answer» ANSWER :A

Discussion

31262.	The correct thermodynamic conditions for a non-spontaneous reaction at all temperature is
Answer» `(delta H LT 0 and delta S GT 0)` `(delta H lt 0 and delta S = 0)` `(delta H gt 0 and delta S lt 0)` `(delta H gt 0 and delta S gt 0)` ANSWER :1

Discussion

31263.	The correct thermodynamic conditions for the spontaneous reaction at all temperature is
Answer» `DELTAHLT0 and DeltaS=0` `DELTAHGT0 and DeltaSlt0` `DeltaHlt0 and DeltaSgt0` `DeltaHlt0 and DeltaSlt0` Solution :`DeltaG=DeltaH-T.DeltaS` For,`DeltaHlt0` and `DeltaSgt0, DeltaG=-ve` (ALWAYS) `therefore` SPONTANEOUS at all temperatures.

Discussion

31264.	The correct stucture of ethylenediaminetetraacetic acid (EDTA) is
Answer» SOLUTION :The CORRECT STRUCTURE of EDTA is

Discussion

31265.	The correct structure of the product of the following reaction will be (AAK_MCP_37_NEET_CHE_E37_009_Q01)
Answer» `(AAK_MCP_37_NEET_CHE_E37_009_A01)` ANSWER :C

Discussion

31266.	The correct structure of trans-2-hexenal is :
Answer» SOLUTION :

Discussion

31267.	The correct structure representation of carboxylate ion is
Answer» Solution :`R-COOH OVERSET(-H^(+))to R-COO^(-)` is a RESONANCE HYBRID of resonating structures.

Discussion

31268.	The correct structure of the product 'A' formed in the reaction
Answer» SOLUTION :

Discussion

31269.	The correct structure of the product 'A' formed in the reaction A is ……..
Answer» SOLUTION :

Discussion

31270.	The correct structure of the drug paracetamol is
Answer» ANSWER :B

Discussion

31271.	The correct structure of the drug paracetamol is ...............
Answer» SOLUTION :

Discussion

31272.	The correct structure of the drug paracetamol is :
Answer» ANSWER :B

Discussion

31273.	The correct structure of the dipeptide gly-ala is
Answer» `NH_2overset(CH_(2))overset(\|)underset(H)underset(\|)-underset(O)underset(\|\|)(C)-NH -CH_(2) -overset(O)overset(\|\|)(C)-OH` `H_(2)N-overset(H)overset(\|)underset(H)underset(\|)(C)-overset(O)overset(\|\|)(C)-overset(H)overset(\|)(N)-underset(CH_(3))underset(\|)(CH)-overset(O)overset(\|\|)(C)-OH` `H-N-overset(H)overset(\|)underset(H)underset(\|)(C)-overset(O)overset(\|\|)(C)-NH-overset(H)overset(\|)underset(CH_(2))underset(\|)(C)-overset(O)overset(\|\|)(C)-OH` Solution :

Discussion

31274.	The correct structureof thedipeptide gly - ala is .
Answer» Solution :`H_(2)N - underset("(Gly)")(CH_(2))-overset(O)overset(\|\|)(C)- overset(H)(N) - CH - underset("(Ala)")underset(CH_(3))underset(\|)(CH) - overset(O)overset(\|\|)(C) -OH`

Discussion

31275.	The correct structure of product, D formed in the following sequence of reactions is
Answer» ANSWER :B

Discussion

31276.	The correct structure of product B, formed in the reaction sequence is (AAK_MCP_35_NEET_CHE_E35_020_Q01)
Answer» `(AAK_MCP_35_NEET_CHE_E35_020_A01)` ANSWER :D

Discussion

31277.	The correct structure of o-dihalobenzne is …….
Answer» ANSWER :B

Discussion

31278.	The correct structure of hydroquinone or quinol is
Answer» (`AAK_MCP_36_NEET_CHE_E36_004_A01`) ANSWER :B

Discussion

31279.	The correct structure of glycine at given pH are :
Answer» `H_(3) overset(oplus)(N)CH_(2)-underset(underset(O)(\|\|))(C)-OH""atpH=2.0` `H_(3)overset(oplus)(N)CH_(2)-underset(underset(O)(\|\|))(C)-O^(Theta)""at pH=6.0` `H_(2)NCH_(2)-underset(underset(O)(\|\|))(C)-O^(Theta)` `H_(2)NCH_(2)-underset(underset(O)(\|\|))(C)-OH""atpH=12` SOLUTION :At acidic `pH`, glycine will convert to cation and at basic `pH` glycine will convert to anion.

Discussion

31280.	The correct structure of Fe(CO)_(5) is
Answer» octahedral TETRAHEDRAL square pyramidal TRIGONAL bipyramidal ANSWER :D

Discussion

31281.	The correct structure of ethylenediamineteraacetic acid (EDTA) is
Answer» SOLUTION :is the CORRECT STRUCTURE of EDTA.

Discussion

31282.	The correct structure of Fe(CO)_5 is
Answer» octahedral tetrahedral square pyramidal trigonal bipyramidal Answer :A

Discussion

31283.	The CORRECT structure of ethyldiaminetetraacetic acid (EDTA) is ____________.
Answer» ANSWER :C

Discussion

31284.	The correct structure of drug paracetamol is
Answer» ANSWER :B

Discussion

31285.	The correct structure of 4-bromo-3-methyl but-1 ene is:
Answer» `BrCH=C(CH_(3))_(2)`<BR>`H_(2)C=C(CH_(3))CH_(2)CH_(2)Br` `H_(2)C=CH-CH(CH_(3))-CH_(2)Br` `CH_(3)-C(CH_(3))=CHCH_(2)Br` Answer :C

Discussion

31286.	The CORRECT structure of dipeptide gly-ala is _________.
Answer» `NH_2- UNDERSET(H) underset(\|) OVERSET(CH_2SH)overset(\|)C-underset(O)underset(\|\|)C-NH-CH_2-overset(O)overset(\|\|)C-OH` `H_2N-underset(H) underset(\|) overset(H) overset(\|)C-overset(O)overset(\|\|)C-overset(H)overset(\|)N-underset(CH_3)underset(\|)CH-overset(O)overset(\|\|)C-OH` `H_2N-underset(H) underset(\|) overset(H) overset(\|)C-overset(O)overset(\|\|)C-NH-underset(CH_2SH)underset(\|) overset(H) overset(\|)C-overset(O)overset(\|\|)C-OH` ANSWER :C

Discussion

31287.	The correct structure for compound B will be:
Answer» ANSWER :B

Discussion

31288.	The correct structural formula of pyridinium chlorochromate is ……
Answer» ANSWER :A

Discussion

31289.	The correct structural formula of potassium tri oxalate aluminate (III) is
Answer» `K_3[AL(C_2O_4)_3]` `K_3[Al(C_2O_4)_2]` `K_2[Al(C_2O_4)_2]` `K_2[Al(C_2O_4)_3]` ANSWER :A

Discussion

31290.	The correct statements with respect to Ellingham's diagram among the following are I) Magnesium reduces aluminium oxide below 1700 K II) Aluminium reduces magnesium oxide above 1700 KIII)Aluminium reduces magnesium oxide below 1700 K IV) Magnesium reduces aluminium oxide above 1700 K
Answer» I & II II & III III & IV II, III & IV ANSWER :A

Discussion

31291.	The correct statemet is
Answer» the earlier members of lanthanoid series RESEMBLE CALCIUM in theirchemicalproperties. the extent ofactinoid contractionisalmostthe sameaslanthanoid contrction. in general, Inathnoid and actinoids andactinoids do notshow VARIABLEOXIDATION states. `Ce^(4+)` inaquesoussoltuion is not known. Solution :LANTHANOIDS are placaed in the samegroup (2) inwhichtheelement Ca occupies a POSITION. Therefore, theearlier members of theseries resembleCa in theirchemical properties.

Discussion

31292.	The correct statement(s) to the adsorption of a gas on a solid surface is (are)
Answer» Adsorption is ALWAYS exothermic Physisorption may transform into chemisorption at high TEMPERATURE Physisorption INCREASES with increasing temperature but chemisorption DECREASES with increasing temperature Chemisorption is more exothermic than physisorption, however it is very slow due to higher ENERGY of activation Solution :Adsorption is exothermic at high temp physisorption transfer to chemical adsorption `DetlaH` is more for chemisorption [40 - 400] Activation energy in more

Discussion

31293.	The correct statements (s) regarding, (i) HClO, (ii) HClO_(2) ,(iii) HClO_(3)and (iv) HClO_(4) is are
Answer» The number of Cl=O bonds in (ii) and (III) together is two The number of lone PAIRS of electrons on Cl in (ii) and (iii) together is three The hybridization of Cl in (IV) is `sp^(3)` AMONGST(i) to (iv), the strongest acid is (i) Solution : `` Number of lonepair on Cl in (ii) & (iii) together is 3 `` Hybridisation of Cl in (iv) is `sp^(3)` `**` Strongest acid is `HClO_(4)` (iv)

Discussion

31294.	The correct statements (s) about Cr^(2+) and Mn^(3)is(are) [Atomic numbers of Cr= 24 and Mn= 25]
Answer» `Cr^(2+)` is a reducing agent `Mn^(3+0` is an oxidizing agent Both `Cr^(2+)` and `Mn^(3+)` exhibit `d^(4)`electronic CONFIGURATION When `Cr^(2+)` is used as a reducing agent, the CHROMIUM ion attains `d^(5)` configuration Solution :(a) `Cr^(2+)` is a reducing agent as it gets oxidizd to `Cr^(3+) ( 3d^(3)` or `t_(2g)^(3)`which is a stable half-filled configuration) (b) `Mn^(3+)` is an oxidizing agent asitgets reduced to `Mn^(2+)( 3d^(5)`which is more stablehalf-filledconfiguration ). (c )`Cr( 24) = 3d^(4) 4s^(2):. Cr^(2+ ) = 3d^(4)` `Mn(25) = 3d^(5) 4s^(2):.Mn^(3+) = 3d^(4)` Thus, both `Cr^(2+)` and `Mn^(3+)` have `d^(4)` electronic configuration . (d) When `Cr^(2+)`is usedas a REDUCINGAGENT, it is OXIDIZED to `Cr^(3+)` which has `d^(3)` and not `d^(5)` configuration.

Discussion

31295.	The correct statements regarding Mg(ClO_(4))_(2) ?
Answer» is a SALT of hypochlorous acid is a salt of PERCHLORIC acid is called ANHYDRONE is "used in dry BATTERY" Solution :`Mg(ClO_(4))_(2) ` is a salt of perchloric acid `Mg(ClO_(4))_(2)` is called Anhydrone `Mg(ClO_(4))_(2)` is used an the electrolyte in dry batter.

Discussion

31296.	The correct statement(s) regarding (i) HClO, (ii) HClO_(2), (iii) HClO_(3) and (iv) HClO_(4), is (are)
Answer» The number of CL = O bonds in (II) and (iii) TOGETHER is TWO The total number of lone pairs of electrons on Cl in (ii) and (iii) together is three The hybridization of Cl in (IV) as `sp^(3)` Amongst (i) to (iv), the strongest acid is (i) Solution :(a) Statement (a) is wrong because the number of Cl = O bonds in (ii) and (iii) is 1 + 2 = 3. (b) Statement (b) is correct because the lone pairs of electrons on Cl in (ii) and (iii) is 2 + 1 = 3. (c) Statement (c) is also correct since hybridization of Cl in (iv) is `sp^(3)`. In fact, it is `sp^(3)` in all the four acids. (d) Statement (d) is wrong because strongest acid is (iv) and not (i).

Discussion

31297.	The correct statements regarding defects in solids are
Answer» FRENKEL defect is usually favoured by a very small difference in the sizes of CATION an anion Frenkel defect is a dislocation defect trapping of an electron in the lattice leads to the FORMATION of F-center Schottly DEFECTS have no effect on the physical properties of solids. Solution :When an ion is missing from its normal position and occupies an interstitaial SITE between the lattice points, Frenkel defect arises, hence it is a dislocation defect. The electrons trapped in anion vacancies are referred to as F-centers. Schottky defects arise when some atoms or ions are missing from their normal lattice points. Due to the presence of large number of vacancies in crystals, its density (i.e. physical property) is lowered.

Discussion

31298.	The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.
Answer» (i) and (IV) only (II) and (III) only (i),(ii) and (iv) only All of these. Answer :C

Discussion

31299.	The correct statement(s) pertiaining to the adsorption of a gas on a solid surface is (are)
Answer» Adsorption is always exothermic Physisorption may transform into chemisorption at high TEMPERATURE Physisorption increases with INCREASING temperature but chemisorption DECREASES with increasing temperature Chemisorption is more exothermic than physisorption, however it is very SLOW DUE to higher energy of activation. Answer :A::B::D

Discussion

31300.	The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)
Answer» Adsorption is always oxothermic PHYSISORPTION may transform into chemisorption at HIGH TEMPERATURE Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature Chemisorption is more exothermic than physisorption, howerver it is very SLOW due to higher energy of activation Solution :Only (C ) is incorrect because physisorption decreases with increasing temperature and chemisorption increase initially with increasing temperture.

Discussion

Explore topic-wise InterviewSolutions in .

The cost of electricity required to deposit 1 g of Mg is Rs.3.00. The cost of deposit 8 g of Al is (al.mass Al = 27 , Mg = 24)

The cost of electricity required to deposit 1 g of Mg is Rs 3.00. The cost to deposit 8 g of Al is __________. )At. Mass Al = 27 , Mg = 24)

The cost at 5 paise/KWH of operating an electric motor for 8 hours which takes 15 amp at 110V is

The corrrect relationship between K_c and K_p is gaseous equilibrium is:

The corrosion of iron object is not favoured by

The corrosion of iron object is favoured by

The corrosion of iron object is favoured by:

The correctr statement regarding electrophile is-

The correct values of ionisation energies of Si, P, Cl and S are respectivey:

The correct values of ionization enthalpies (in kJ "mol"^(-1)) of Si, P, Cl and S respectively are :-

The correct three dimensional presentation of ethane is

The correct thermodynamic conditions for a non-spontaneous reaction at all temperature is

The correct thermodynamic conditions for the spontaneous reaction at all temperature is

The correct stucture of ethylenediaminetetraacetic acid (EDTA) is

The correct structure of the product of the following reaction will be (AAK_MCP_37_NEET_CHE_E37_009_Q01)

The correct structure of trans-2-hexenal is :

The correct structure representation of carboxylate ion is

The correct structure of the product 'A' formed in the reaction

The correct structure of the product 'A' formed in the reaction A is ……..

The correct structure of the drug paracetamol is

The correct structure of the drug paracetamol is ...............

The correct structure of the drug paracetamol is :

The correct structure of the dipeptide gly-ala is

The correct structureof thedipeptide gly - ala is .

The correct structure of product, D formed in the following sequence of reactions is

The correct structure of product B, formed in the reaction sequence is (AAK_MCP_35_NEET_CHE_E35_020_Q01)

The correct structure of o-dihalobenzne is …….

The correct structure of hydroquinone or quinol is

The correct structure of glycine at given pH are :

The correct structure of Fe(CO)_(5) is

The correct structure of ethylenediamineteraacetic acid (EDTA) is

The correct structure of Fe(CO)_5 is

The CORRECT structure of ethyldiaminetetraacetic acid (EDTA) is ____________.

The correct structure of drug paracetamol is

The correct structure of 4-bromo-3-methyl but-1 ene is:

The CORRECT structure of dipeptide gly-ala is _________.

The correct structure for compound B will be:

The correct structural formula of pyridinium chlorochromate is ……

The correct structural formula of potassium tri oxalate aluminate (III) is

The correct statements with respect to Ellingham's diagram among the following are I) Magnesium reduces aluminium oxide below 1700 K II) Aluminium reduces magnesium oxide above 1700 KIII)Aluminium reduces magnesium oxide below 1700 K IV) Magnesium reduces aluminium oxide above 1700 K

The correct statemet is

The correct statement(s) to the adsorption of a gas on a solid surface is (are)

The correct statements (s) regarding, (i) HClO, (ii) HClO_(2) ,(iii) HClO_(3)and (iv) HClO_(4) is are

The correct statements (s) about Cr^(2+) and Mn^(3)is(are) [Atomic numbers of Cr= 24 and Mn= 25]

The correct statements regarding Mg(ClO_(4))_(2) ?

The correct statement(s) regarding (i) HClO, (ii) HClO_(2), (iii) HClO_(3) and (iv) HClO_(4), is (are)

The correct statements regarding defects in solids are

The correct statement(s) pertiaining to the adsorption of a gas on a solid surface is (are)

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)