94420 + Interview Questions in Chemistry in Class 12 Page 596 InterviewSolution

29751.	The incorrect statement regarding molecular orbital (s) is :
Answer» If there is a nodal plane perpendicular to the intermoleculear axis and lying between the nuclei of bonded ATOMS then corresponding orbitals is antibonding M.O. If a nodal plane lies in the inter-nuclear axis, then corresponing orbitals is (pi) bonding M.O. The `sigma`- bonding MOLECULAR orbital does not contain nodal PLANES containing the internuclear axis The `DELTA`-bonding molecular orbitals possesses three nodal planes containing the internuclear axis Answer :D

Discussion

29752.	The incorrect statement regarding froath floatation process is
Answer» It is BASED on the DIFFERENCE in gravities of the ore Uses Cresols as FROATH stabilizers Uses of PINE OIL as frothing agent Uses sodium ethyl xanthate,` C_2H_5OCS_2Na` as collector Answer :A

Discussion

29753.	The incorrect statement regarding chloral hydrate C Cl_(3)CH(OH)_(2) is :-
Answer» It exhibits intramolecular hydrogen bonding It has 9 LONE PAIR and 9 bond pair It is stable inspite of COEXISTENCE of two-OH groups on a carbon atom Compound is non-planar and polar Answer :B

Discussion

29754.	The incorrect statement regarding forth floatation process is
Answer» It is BASED on the difference in gravities of ORE and gangue Uses cresols as forth stabilizers Uses PINE oil as forthing agent Uses SODIUM ETHYL xanthate, `C_2H_5OCS_2` Na as collector Answer :A

Discussion

29755.	The incorrect statement is:
Answer» The SECOND ionisation ENERGY of Se is greater than that of second ionisation energy of As The FIRST ionisation energy of `C^(2+)` ion is greater than that of rist ionisation energy of `N^(2+)` ion The THIRD ionisation energy of, F is greater than that of third ionisation energy of O Helogens have highest I.E. in respectively period. Solution :

Discussion

29756.	The incorrect statement in the following is
Answer» To ACCOMODATE messenger, shape of the receptor site CHANGES The chemical messenger gives message to the cell by entering into the cell Antagonists inhibit the natural function of receptor The drugs that imitate the natural MESSENGERS are called agonists Solution :No need to ENTER the cell

Discussion

29757.	The incorrectstatement in respect of chromyl chloride test is
Answer» formation of lead chromate formation fo CHROMYL chloride liberation of chlorine formation of red vapours Solution :Chromyl chloride test is used to confirm the presence of `Cl^(-)` in qualitative inorganic anaylis. When a small amount of the substance (salt) is heated with conc. `H_(2)SO_(4)` in presence of `K_(2)Cr_(2)O_(7)`, deep red vapours of chromyl chloride are EVOLVED. `NaCl+H_(2)SO_(4)toNaHSO_(4)+HCl` `K_(2)Cr_(2)IO_(7)+2H_(2)SO_(4)to2KHSO_(4)+2CrO_(3)+H_(2)O` `CrO_(3)+2HCl to underset("chromyl chloride")(CrO_(2)Cl_(2))+H_(2)O` These vapours are passed through NaOH solution and yellow coloured solution of `Na_(2)CrO_(4)` is obtained. `CrO_(2)Cl_(2)+4NaOHtounderset ("Yellow colour")(Na_(2)CrO_(4))+2NaCl+2H_(2)O` This yellow solution is NEUTRALISED with acetic acid and on addition of lead acetate gives a yellow ppt. of lead chromate `Na_(2)CrO_(4)+Pb(CH_(3)COO)_(2)tounderset("Yellow ppt.")(PbCrO_(4))+2CH_(3)COONa`

Discussion

29758.	The incorrect statement for rhombic sulphur is
Answer» It is INSOLUBLE in water It exist as `S_8` molecules, which is puckered crown ring structure It is white in colour Its MELTING POINT is lower than monoclinic sulphur Answer :C

Discussion

29759.	The incorrect statement for the long form of the periodic table is
Answer» it reflects the sequence of filling the electrons in the order of sub-energy leves s, p , d and f it helps to predict the stable VALENCY STATES of the elements it reflects TRENDS in physical and chemical properties of the elements it helps to predict the relative ionic character of the bond between any two elements. Solution :It does not help to predict the stable valency states of the elements.

Discussion

29760.	The incorrect statement for aldehydes and ketones is
Answer» Methanal, ethanal and propanone are MISCIBLE in water All ALDEHYDES and ketones are fairly soluble in organic solvents like BENZENE, chloroform, etc. Many NATURALLY occurring ALDEHYDE and ketones are used in the blending of perfumes All aldehydes and ketones are fragrant Answer :D

Discussion

29761.	The incorrect statement for 14 g of CO is
Answer» It OCCUPIES 2.24 litre at NTP It corresponds to `1/2` mole of `CO` It corresponds to same mole of `CO` and `N_(2)` It corresponds to `3.01xx10^(23)` molecules of `CO` Solution :14 G of `CO=14/28=0.5` mole 0.5 mole `=3.01xx10^(23)` molecules The molecular WEIGHT of `CO=(15+16)=28` The molecular weight of `N_(2)=14+14=28` Therefore, the incorrect STATEMENT is that it occupies 2.24 litre at NTP.

Discussion

29762.	The incorrect statement for 14 g CO is:
Answer» It OCCUPIES 2.24L at NTP It corresponds to `(1)/(2)` mole of CO It corresponds to same mole of CO and `N_(2)`. It corresponds to `3.01xx10^(23)` molecules of CO Answer :A

Discussion

29763.	The incorrect statement among the following is ________
Answer» Reducing CHARACTER of hydrides of GROUP 15 INCREASES down the group Basicity of hydrides of group 15 increases down the group `NCl_(5)` does not exist Phosphorus and arseniccan FORM `P pi - d pi` bond but not nitrogen Answer :A::B::C::D

Discussion

29764.	The INCORRECT statement among the following is ________.
Answer» in calcination , ore decomposes to form metal oxide zinconium is REFINED by van Arkel method the sulphide ore galena is CONCENTRATED by froth floatation in the metallurgy of IRON, the flux used is `SiO_(2)` ANSWER :D

Discussion

29765.	The incorrect statement among the following
Answer» A CATALYST does not initiate the reaction The ACTION of catalyst in many instances is selective Catalyst MAY LOOSE its catalytic activity at high temperature The composition of catalyst changes at the end of reaction Answer :D

Discussion

29766.	The incorrect statement about the structure of H_2O_2 is
Answer» It is non-linear and non-planar molecule It has an OPEN BOOK TYPE structure Dihedral angle in both gas PHASE and solid phase is 111.5deg Dihedral angle in gas phase is 111.5deg and in solid phase is 90.2deg Answer :C

Discussion

29767.	The incorrect statement about interstitial compounds is :
Answer» They are CHEMICALLY reactive. They are very hard. They RETAIN metallic conductivity. They have HIGH MELTING point. ANSWER :A

Discussion

29768.	The incorrect statement about LDP is :
Answer» It is obtained through the free RADICAL ADDITION of ethene . It consists of liner MOLECULES . It is obtained by the H-atom abstraction Peroxide is used as an initialtor. ANSWER :B

Discussion

29769.	The incorrect set of the formal charge on different atoms in the Lewis structure of N_(3) are :
Answer» `-1, +1, -1` `-1, +1, 0` `-2, +1, 0` `0, +1, -2` SOLUTION :In case of `N_(3)^(-)` formal CHARGE can not be `-1, +1, 0`, because total charge BECOMES ZERO.

Discussion

29770.	The correct order of the thermal stability of hydrogen halides (H-X) is
Answer» `HI GT HBR gt HCl gt HF` `HF gt HCl gt HBr gt HI` `HCl gt HF gt HBr gt HI` `HI gt HCl gt HF gt HBr` ANSWER :B

Discussion

29771.	The Incorrect order of property of the following is : (a) (Basic nature) Na_(2)O gt MgO gt Al_(2)O_(3)gt SiO_(2) (b) (2^(nd)I.P.)Na gt S gt P gt Si (c ) (Electron affinity) O gt S gt Se (d) (Size l^(-) lt l lt l^(+)
Answer» a, C, d B, c, d c, d a, b, c Solution :`[H^(+)]_(HCl)=10^(-5)xx(1)/(1000)=10^(-8)` `THEREFORE 10^(-7)M H^(+)` (of water) cannot be neglected `[H^(+)]_("total")=10^(-8)+10^(-7)=1.1xx10^(-7)` `pH=7-log 1.1 ~~ 6.98`

Discussion

29772.	The incorrect order of lattice energy is :
Answer» `AlF_(3) gt MgF_(2)` `Li_(3)N gt Li_(2)O` `NaCl gt LIF` `TiC gt SCN` Answer :C

Discussion

29773.	The incorrect order of first ionization energy is:
Answer» `Au gt Cu gt Ag` `PT gt NI gt Pd` `C gt Pb gt SN` `B gt Ga gt Al` Answer :B

Discussion

29774.	The incorrect order of acidic strength is (DCE 2009)
Answer» `HI gt HBr gt HCl` `HIO_(4) gt HBrO_(4) gt HClO_(4)` `HClO_(4) gt HClO_(3) gt HClO_(2)` `HFgt H_(2)O gt NH_(3)` Solution :The acidic strength of oxy0acids decreases DOWNWARDS in a group. The correct order of acidic strength of oxyacids of HALOGENS is `HClO_(4) gt HBrO_(4) gt HIO_(4)`.

Discussion

29775.	The incorrect order of bond angle :-
Answer» `CO_(2) gt CO_(3)^(2-) gt CF_(2)Cl_(2)` `NO_(2)^(+) gt NO_(3)^(-) gt NO_(2)^(-)` `XeF_(2) gt XeO_(3) gt XeO_(4)` `PH_(3) gt AsH_(3) gt SbH_(3)` ANSWER :C

Discussion

29776.	The incorrect order is:
Answer» `N gt P gt As`: strength of `pi`-bond with oxygen atom `SiF_(4) gt SiCl_(4) gt SiBr_(4) gt SiI_(4)`: Thermal stability `H_(2)S gt H_(2)Se gt H_(2)TE`: Arrhenious acid character `CaBr_(2) gt MgBr_(2) gt BeBr_(2)` Melting point Solution :Correct ORDER of Arrhenious acid character `H_(2)S LT H_(2)Se lt H_(2) Te` the vlaue of `K_(a)` is maximum for `H_(2)Te`, due to least bond enegy among givenn hydrides.

Discussion

29777.	The incorrect order is :
Answer» Covalent character : `PbCl_(2)gtCaCl_(2)gtSrCl_(2)gtBaCl_(2)` Thermal stability : `PbF_(4)gtPbCl_(4)gtPbBr_(4)gtPbI_(4)` Melting point : `KFgtKClgtKBrgtKI` BOILING point : `CHCl_(3)gtCH_(3)ClgtC Cl_(4)` Answer :D

Discussion

29778.	The incorrect order indicated against the rate of reaction , aA+bBoverset(h) to C then
Answer» `-(d[A])/(DT)=a/b xx (d[B])/(dt) ` `-(d[A])/(dt)=b/a xx (d[B])/(dt) ` `-(d[A])/(dt)=-1/2(d[B])/(dt)=+(d[C])/(dt)` `-(d[A])/(dt)= -b/a xx (d[B])/( dt)=- b/a xx (d[B])/(dt)` SOLUTION :According to the EXPRESSION `- (1)/(a) xx (d[A])/(dt) = - (1)/(b) (d[B])/(dt) therefore -(d[A])/(dt) = - (a)/(b) (d[B])/(dt)`

Discussion

29779.	The incorrect IUPAC name of a compounds is 3,3-diethyl butane. The correct name is :
Answer» 3,3-Dimethyl haxzne 1,1-Diethylmethyl pentane 3-Ethyl-3-methylpentane 3-Ethymethypentane. Solution :`{:(""OVERSET(2)CH_(2)overset(1)(CH_(3))),(H_(3)overset(1)-H_(2)overset2(C)-""^(3)C-CH_(3)),(""overset(4)(CH_(2))overset(5)(CH_(3))):}` 3-Ethyl-3-methylpentane

Discussion

29780.	The incorrect expression among the following is -
Answer» In isothermal process, `w_("reversible")=-NRT"ln"V_(f)/V_(i)` `lnK=(DeltaH^(@)-TDELTAS^(@))/(RT)` `K=e^(-DeltaG^(@)//RT)` `(DeltaG_("SYSTEM"))/(DeltaS_("total"))=-T` ANSWER :B

Discussion

29781.	The incorrect example is
Answer» Keratin and Myosin - FIBROUS PROTEINS Insulin and Albumin- Globular proteins GLYCYLALANINE - Dipeptide HAEMOGLOBIN - Derived protein Solution :Haemoglobin - Derived protein

Discussion

29782.	The incorrect combination is
Answer» I,III,R II,III,S IV,I,R IV,I,P Answer :C

Discussion

29783.	The incorrect among the following is:
Answer» The FIRST IONIZATION potential of Al is less than the first ionization potential of Mg The second ionizaztion potential of Mg is GREATER than the second ionization potential of Na The first ionization potential of Na is less than the first ionization potential of Mg The THIRD ionization potential of Mg is greater than the third ionization potential of Al Answer :B

Discussion

29784.	The impurties associated with minerals used in metallurgy are collectively called
Answer» Slag Flux Gangue Ore Answer :C

Discussion

29785.	The impurity of which element is present in Ruby and Sapphire respectively.
Answer» Cd, Cr <BR>Cr, Cd Sr, Br NI, CU Answer :B

Discussion

29786.	The impurity of sulphur makes the iron:
Answer» FIBROUS RED short Cold short Malleable Answer :B

Discussion

29787.	The impurities like As_(2)O_3 result in the poisoning of catalyst. In contact process, the impurities of arsenic are removed by
Answer» gelantinuous `FE(OH)_(3)` `Al(OH)_(3)` `CR(OH)_(3)` `Fe_(2)O_(3)` ANSWER :A

Discussion

29788.	The impurities associated with ores is……
Answer» Flux Slag Gangue Metal Answer :C

Discussion

29789.	The impurities associated with minerals are called :
Answer» SLAG Flux Gangue ORE. ANSWER :C

Discussion

29790.	The important use of Kohlrausch's law is deducing the
Answer» `lambda_(INFTY)` value of weak ELECTROLYTE. `lambda_(infty)` value of strong electrolyte. `lambda_(C)` value of weak electrolyte. `lambda_(C)` value of weak electrolyte. Answer :A

Discussion

29791.	The important step in Cannizzaro.s reaction is the intermolecular shift of:
Answer» Proton H-atom Hydride ion Hydronium ion Answer :C

Discussion

29792.	The important ore of iron is :
Answer» Siderite Haematite Pyrites Bauxite Answer :B

Discussion

29793.	The important monosaccharides are :
Answer» Aldoses Ketoses Aldoses and ketoses None Answer :C

Discussion

29794.	The important method for the fixation of nitrogen is
Answer» HABER Solvay Deacon Fischer method Solution :Haber's PROCESS `to` industrial process `N_(2)3H_(2) overset(Fe-Mo)UNDERSET({:(650-800K),("200-350 atm"):})HARR 2NH_(3)`

Discussion

29795.	The important features of genetic code are a) It is universal b) It is commaless c) It is not degenerate d) Third base is not always specific.
Answer» a only b, C only b, c and d only a, BAND d only Answer :D

Discussion

29796.	The important component in our cell membrane is
Answer» RETINOL PHENOL CHOLESTEROL METHANOL SOLUTION :Cholesterol

Discussion

29797.	The important by product in the purification of bauxite by Serpeck's process is
Answer» HCI `N_(2)` `NH_(3)` `NO_(2)` Answer :C

Discussion

29798.	The imperfection in crystal increases with increases in temperature.
Answer» If both Statement- I and Statement- II are true, and Statement - II is the correctexplanation of Statement– I. If both Statement - I and Statement - II are true but Statement - II is not thecorrect EXPLANATION of Statement – I. If Statement - I is true but Statement - II is FALSE. If Statement - I is false but Statement - II is true. ANSWER :A

Discussion

29799.	The important advantage(s) of Lintz and Donawitz (L.D.) process for the manufacture of steel is (are)
Answer» The PROCESS is very quick Operation costs are low Better quality steel is obtained Scrap IRON can be used Answer :A::C::D

Discussion

29800.	The immiscible liquid system aniline-water boils at 98^@Cunder a pressure of760 mm. At this temperature the vapour pressure of water is 707 mm. If this system is distilled in steam, what fraction of total weight of the distillate will be aniline?
Answer» ANSWER :0.28

Discussion

Explore topic-wise InterviewSolutions in .

The incorrect statement regarding molecular orbital (s) is :

The incorrect statement regarding froath floatation process is

The incorrect statement regarding chloral hydrate C Cl_(3)CH(OH)_(2) is :-

The incorrect statement regarding forth floatation process is

The incorrect statement is:

The incorrect statement in the following is

The incorrectstatement in respect of chromyl chloride test is

The incorrect statement for rhombic sulphur is

The incorrect statement for the long form of the periodic table is

The incorrect statement for aldehydes and ketones is

The incorrect statement for 14 g of CO is

The incorrect statement for 14 g CO is:

The incorrect statement among the following is ________

The INCORRECT statement among the following is ________.

The incorrect statement among the following

The incorrect statement about the structure of H_2O_2 is

The incorrect statement about interstitial compounds is :

The incorrect statement about LDP is :

The incorrect set of the formal charge on different atoms in the Lewis structure of N_(3) are :

The correct order of the thermal stability of hydrogen halides (H-X) is

The Incorrect order of property of the following is : (a) (Basic nature) Na_(2)O gt MgO gt Al_(2)O_(3)gt SiO_(2) (b) (2^(nd)I.P.)Na gt S gt P gt Si (c ) (Electron affinity) O gt S gt Se (d) (Size l^(-) lt l lt l^(+)

The incorrect order of lattice energy is :

The incorrect order of first ionization energy is:

The incorrect order of acidic strength is (DCE 2009)

The incorrect order of bond angle :-

The incorrect order is:

The incorrect order is :

The incorrect order indicated against the rate of reaction , aA+bBoverset(h) to C then

The incorrect IUPAC name of a compounds is 3,3-diethyl butane. The correct name is :

The incorrect expression among the following is -

The incorrect example is

The incorrect combination is

The incorrect among the following is:

The impurties associated with minerals used in metallurgy are collectively called

The impurity of which element is present in Ruby and Sapphire respectively.

The impurity of sulphur makes the iron:

The impurities like As_(2)O_3 result in the poisoning of catalyst. In contact process, the impurities of arsenic are removed by

The impurities associated with ores is……

The impurities associated with minerals are called :

The important use of Kohlrausch's law is deducing the

The important step in Cannizzaro.s reaction is the intermolecular shift of:

The important ore of iron is :

The important monosaccharides are :

The important method for the fixation of nitrogen is

The important features of genetic code are a) It is universal b) It is commaless c) It is not degenerate d) Third base is not always specific.

The important component in our cell membrane is

The important by product in the purification of bauxite by Serpeck's process is

The imperfection in crystal increases with increases in temperature.

The important advantage(s) of Lintz and Donawitz (L.D.) process for the manufacture of steel is (are)

The immiscible liquid system aniline-water boils at 98^@Cunder a pressure of760 mm. At this temperature the vapour pressure of water is 707 mm. If this system is distilled in steam, what fraction of total weight of the distillate will be aniline?