94420 + Interview Questions in Chemistry in Class 12 Page 542 InterviewSolution

27051.	The octane numbers of 2,2,4-trimethylpentane (isooctane) and n-pentane are respectively-
Answer» 50,50 100,0 0,100 50,0 Answer :B

Discussion

27052.	The octet rule is not valid for which one of the following molecules ?
Answer» `CO_(2)` `H_(2)S` `NH_(3)` `BF_(3)` SOLUTION :Octate rule is INVALID for `BF_(3)`

Discussion

27053.	Theodourofamineis
Answer» ODOURLESS PUNGENT fishy garlic LIKE ANSWER :C

Discussion

27054.	The number of ions formed when cupra ammonium sulphate is dissolved in water
Answer» 1 2 4 zero Answer :B

Discussion

27055.	The octahedral complex of a metal ion M^(3+) with four monodentate ligands L_(1),L_(2),L_(3) and L_(4) absorb wavelength in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is :
Answer» `L_(4) lt L_(3) lt L_(2) lt L_(1)` `L_(1) lt L_(3) lt L_(2) lt L_(4)` `L_(3) lt L_(2) lt L_(4) lt L_(1)` `L_(1) lt L_(2) lt L_(4) lt L_(3)` ANSWER :B

Discussion

27056.	The number of ions formed when copper ammonium sulphate, is dissolved in water is:
Answer» 1 2 4 Zero Answer :B

Discussion

27057.	The octahedral complex of a metal ion M^(3+)with four monodentate ligands L_(1), L_(2), L_(3) and L_(4) absorb wavelengthin the region of red, green, yellow and blue respectively. The increasing order of ligand strengths of the four ligands is :
Answer» `L_(4) lt L_(3) lt L_(2) lt L_(1)` `L_(1) lt L_(3) lt L_(2) lt L_(4)` `L_(3) lt L_(2) lt L_(4) lt L_(1)` `L_(1) lt L_(2) lt L_(4) lt L_(3)` Solution :The ENERGY increases in the order (VIBGYOR) RED < yellow < green < BLUE The complex absorbing LOWER energy will be of lower strength of ligand and therefore, the correct order of ligand strength is `L_(1) lt L_(3) lt L_(2) lt L_(4)`

Discussion

27058.	The number of ions formed on dissolving one molecule of FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O is
Answer» 4 5 3 6 Answer :B

Discussion

27059.	The octahedral shape is associated with :
Answer» `PF_(5)` `SF_(4)` `TeF_(6)` `ClF_(3)` ANSWER :C

Discussion

27060.	The number of octahedral voids in a unit cell of cubic close packed structure is
Answer» SOLUTION :`[FE(CN)_(6)]^(4-)` (after REARRANGEMENT)

Discussion

27061.	The number of ions formed on dissolving one molecule of FeSO_4(NH_4)_2SO_46H_2O in water is:
Answer» 4 5 3 6 Answer :B

Discussion

27062.	The occurrence of reaction is impossible if
Answer» `DELTAH" is"+"ve",DELTAS" is"+"ve"` `DeltaH" is"-"ve",DeltaS" is"-"ve"` `DeltaH" is"-"ve",DeltaS" is"+"ve"` `DeltaH" is"+"ve",DeltaS" is"-"ve"` ANSWER :D

Discussion

27063.	The obsrved osmotic pressure foe a 0.10 M solution of Fe (NH_(4))_(2) (SO_(4)) _(2) at 25^(@)C is 10.8 atm. The expected and experimental (observed) values of van't Hoff factor (i) will be respectively .
Answer» 5 and `4.42` `4 and 4.00` 5 and `3.42` `3 and 5.42` Solution :GIVEN `PI _(AB)= 10.8` atm `pi _(nw) =CST =0.10 xx0.0821 xx298 =2.446` now experimental value of (i) `= ("Observed osmotic pressure")/("Normal osmotic pressure") = (10.8)/(2.445) =4.42`

Discussion

27064.	The number of ions formed in aqueous solution by the compound [Co(NH_3)_4CI_2]CI is:
Answer» 2 3 4 7 Answer :A

Discussion

27065.	The occurrence of a reaction is impossible if
Answer» `DeltaH" is "+ve, DeltaS " is ALSO + ve but "DELTAHLT TDeltaS` `DeltaH" is- ve , "DeltaS " is also - ve but "DeltaH GT TDeltaS` `DeltaH" is - ve ,"DeltaS " is "+ve` `DeltaH" is + ve ,"DeltaS " is "- ve` SOLUTION :`+ ve DeltaH and - ve DeltaS` both oppose the reaction.

Discussion

27066.	The number of iodine atoms (N) present in 1 "cm"^(3) of its 0.1 M solution is
Answer» `6.02 xx 10^(23)` `6.02 xx 10^(2)` `6.02 xx 10^(19)` `1.204 xx 10^(20)` Solution :1 cc of 0.1 M `I_(2)` SOL. `=0.1/1000=10^(-4)` mol `N = n xx N_(A)` `=10^(-4) xx 6.02 xx 10^(23)` molecules `=6.02 xx 10^(19)` molecules `=2 xx 6.02 xx 10^(19)` atoms `=1.204 xx 10^(20)`

Discussion

27067.	The observed rat of acemical reaction is substantially lower than the collision frequecy. One or more of the following statements is/are true to account for this fact. A. The reactants to do not have the required energy B. The partnes do not collide in the proper orientation (C) Collision complex eists for a very short time. D. Collision frequecny over estimates the number of effective collisions.
Answer» A,B and C A,B and D B,C and D A,C and D ANSWER :A

Discussion

27068.	The number of iodine atoms present in 1cm^(3) of its 0.1 M solutions is :
Answer» `6.02 xx 10^(23)` `6.02xx10^(22)` `6.02xx10^(19)` `1.204xx10^(20)` Solution :`1000cm^(3)` of 0.1 M solution CONTAIN `=0.1` MOLE `1cm^(3)` of 0.1 M solution contain `=(0.1)/(1000)` `=1XX10^(-4)`mole `1xx10^(-4)` mole of `I_(2)=6.02xx10^(23)xx2xx1xx10^(-4)` `=1.204xx10^(20)` atoms

Discussion

27069.	The observed osmotic pressure of a solution of benzoic acid in benzene is less than its expected value because
Answer» Benzene is a non-polar SOLVENT Benzoic acid MOLECULES are assocuated in benzene Benzoic acid molecules are dissociated in benzene Benzoic acid is an organic COMPOUND Answer :B

Discussion

27070.	Theobserveddepressionin thefreezingpointof waterfor aperticularsolutionis 0.087 K . Calculatethe molalityof thesolutionif molaldepressionconstantfor wateris 1.86 K kg mol^(-1)
Answer» SOLUTION :0.0467 MOL `KG^(-1)`

Discussion

27071.	The number of intermediates + transition states passible during the following reaction is ________
Answer» ANSWER :9

Discussion

27072.	The observed angle of rotation of 2.0 gm sucrose containing 20 ml of aqueous solution in a polarimeter tube of 15 cm length is +15.3^(@). What is the specific rotation of this solution of sucrose ?
Answer» `104^(@)` `102^(@)` `96.5^(@)` `102.9^(@)` SOLUTION :`102^(@)`

Discussion

27073.	The number of incomplete orbitals in inner transition elements is:
Answer» 3 4 2 1 Answer :A

Discussion

27074.	The observed and calculated E^0 values for M^(+2)/M are same for
Answer» Fe Co Ni Cu Answer :A

Discussion

27075.	The no.of hydroxyl ions produced by one molecule of Na_(2)CO_(3) on hydrolysis is
Answer» 2 1 3 4 Solution :`Na_(2)CO_(3)+2H_(2)Oto2NaOH+H_(2)CO_(3) and 2NAOH underset(("IONISATION"))hArr2Na^(+)+2OH^(-)` Hence, it is clear that `2OH^(-)` ions will be formed on hydrolysis of ONE molecule of sodium CARBONATE.

Discussion

27076.	The observed angle of rotation of 0.2 gm of Sucrose in 1 ml of aqueous solution in a Polarimeter tube 1 dm long is + 13.3^(@). What is the specific rotation of the solution of Sucrose ?
Answer» `- 66.5^(@)` `+66.5^(@)` `+ 6.65^(@)` 1 Solution :`+ 66.5^(@)`

Discussion

27077.	The observed and calculated E' values for M^(+2)//M are same for
Answer» Fe Co Ni Cu Answer :A

Discussion

27078.	The number of hydroxyl groups in pyrophosphoric acid is
Answer» 3 4 5 7 Answer :B

Discussion

27079.	The observation by Louis Pasteur that crystals of certain compounds exist in the form of mirror images laid the foundation of modern stereochemistry.
Answer» ANSWER :1

Discussion

27080.	The O-O -H bond angle in H_(2)O_(2) is
Answer» `106^(@)` `109^(@),28` `120^(@)` NONE of these Answer :D

Discussion

27081.	The number of hydrogen bonds present in the sequence of a stretch of a double helical DNA 51 ATGCCTAA 3' is
Answer» 16 19 24 20 Answer :B

Discussion

27082.	The number of hydrogen atoms required to convert 1 mole of nitrobenzene to hydrazobenzene is
Answer» 5 10 4 8 Answer :A

Discussion

27083.	The O-O bond length in O_(3) is equal to that of
Answer» SINGLE bond DOUBLE bond between single and double bond between double and TRIPLE bond Answer :C

Discussion

27084.	The number of hydrogen atoms present in 25.6 g of sucrose (C_(12)H_(22)O_(11)) which has a molar mass of 342.3 g is:
Answer» `22xx10^(23)` `9.91xx10^(23)` `11xx10^(23)` `44xx10^(23)` SOLUTION :Number of moles of SUCROSE `=("MASS")/("Molar mass")=(25.6)/(342.3)` Number of moles of hydrogen ATOM `=0.075xx22` Number of atoms of hydrogen `=0.075xx22xx6.023xx10^(23)` `=9.9xx10^(23)`.

Discussion

27085.	The number of hydrogen atoms attached to phsophorus atom in hypophosphorus acid is :
Answer» ZERO TWO one THREE ANSWER :C

Discussion

27086.	The number of H^(+) ions present in 1 ml of a solution whose pH is 13 is :
Answer» `6.022xx10^(10)` `6.022xx10^(7)` `6.022xx10^(20)` `6.022xx10^(23)` ANSWER :B

Discussion

27087.	The number of [H] required to reduce with Sn-HCl to give aniline.
Answer» SOLUTION :

Discussion

27088.	The O-O bond length in Ozone is
Answer» `1.33 A ^(0)` `1.28A ^(0)` `1.48A ^(0)` `1.39A ^(0)` ANSWER :B

Discussion

27089.	The number of gram molecules of a substance present in unit volume is termed as
Answer» Activity NORMAL SOLUTION MOLAR CONCENTRATION Active mass

Discussion

27090.	The O - O bond length in H_2O_2 is :
Answer» `1.54 OVERSET@A` `1.48overset@A` `1.34 overset@A` `1.01overset@A` ANSWER :B

Discussion

27091.	The number of grams of H_(2)SO_(4) present in 0.25 mole of H_(2)SO_(4) is:
Answer» 0.245 2.45 24.5 `49.0` ANSWER :C

Discussion

27092.	The nylon salt (Hexamethylenediammonium adipate) is
Answer» `OVERSET(+)(N)H_3(CH_2)_4overset(+)(N)H_3overset(-)(O)OC(CH_2)_4 COO^(-)` `overset(+)(N)H_3(CH_2)_6overset(+)(N)H_3overset(-)(O)OC (CH_2)_4COO^(-)` `""^(-)OOC(CH_2)_6COO^(-)overset(+)(N)H_3(CH_2)_4 overset(+)(N)H_3` `H_2N (CH_2)_6 NH_2 overset(-)(O)OC(CH_2)_4COO^(-)` Solution :`overset(+)(N)H_3(CH_2)_6overset(+)(N)H_3overset(-)(O)OC (CH_2)_4COO^(-)`

Discussion

27093.	The number of gram molecules of oxygen in6.02 xx 10^24 CO molecules is :
Answer» 10 gram molecules 5 gram molecules 1 gram molecule 0.5 gram molecule Solution :No. of ATOMS of OXYGEN in`6.02 xx 10^24` CO molecules ` = 6.02 xx 10^24` (each CO contains 1 oxygen ATOM) No. of oxygen molecules ` = (6.02 xx 10^24)/(2) = 3.01 xx 10^24` Gram molecules of oxygen ` = (3.01 xx 10^24)/(6.02 xx 10^23) = 5`

Discussion

27094.	The nutrient used in the body as a source of energy as a raw material for growthand repair is
Answer» Fat Carbohydrates Proteins Vitamins Answer :C

Discussion

27095.	The number of gram molecules of chlorine in6.02 xx 10^(25) hydrogen chloride molecules is
Answer» 10 100 50 5 Solution :Number of HCI MOLECULES = `6.02 xx 10^(25)` molecules Number of moles of HCI = `(6.02 xx 10^(25))/(6.02 xx 10^(23)) = 100` moles. `therefore` Gram MOLECULAR mass of chlorine in ` 6.023 xx 10^(25)` molecules of HCI = 100/2 = 50.

Discussion

27096.	The number of gram atoms of oxygen in 0.2xx10^(24)CO molecules is
Answer» `1` `0.5` `5` `9` Solution :`6.02xx10^(23)` molecules of CO = 1 mole of CO `6.02xx10^(24)` MOLES of CO = 10 moles of CO 1 mole of CO CONTAIN 1 g atom of oxygen 10 moles of CO contain 10 g ATOMS of oxygen

Discussion

27097.	The number of protons, electrons and neutrons in ""_(17)^(35)Cl^(-) are respectively
Answer» 17,18,18 17,17,18 17,18,17 17,18,38 Answer :A

Discussion

27098.	The numerical value RT/PV for a gas at critical conditions is ………. Times of RT/PV at normal conditions:
Answer» 4 3/8 8/3 1/4 Answer :C

Discussion

27099.	The numerical value of N/n( where N is the number of molecules in a given sample of the gas and n is the number of moles of the gas ) is
Answer» 8.314 `6.02xx10^(23)` `0.0821` `1.66xx10^(-19)` SOLUTION :N/n represents the number of molecules per MILE of the gas i.e. Avogadro.s number.

Discussion

27100.	The number of gram atoms of oxygen present in 0.25 g mole of (COOH)_2 2H_2Ois :
Answer» 0.125 0.5 1 1.5 Solution :1 MOLE of `(COOH)_2 . 2H_2O` CONTAINS = 6 gatom of oxygen 0.25 mole of `(COOH)_2 . 2H_2O` contains ` = 6 XX 0.25 = 1.5 ` grams atoms

Discussion

Explore topic-wise InterviewSolutions in .

The octane numbers of 2,2,4-trimethylpentane (isooctane) and n-pentane are respectively-

The octet rule is not valid for which one of the following molecules ?

Theodourofamineis

The number of ions formed when cupra ammonium sulphate is dissolved in water

The octahedral complex of a metal ion M^(3+) with four monodentate ligands L_(1),L_(2),L_(3) and L_(4) absorb wavelength in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is :

The number of ions formed when copper ammonium sulphate, is dissolved in water is:

The octahedral complex of a metal ion M^(3+)with four monodentate ligands L_(1), L_(2), L_(3) and L_(4) absorb wavelengthin the region of red, green, yellow and blue respectively. The increasing order of ligand strengths of the four ligands is :

The number of ions formed on dissolving one molecule of FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O is

The octahedral shape is associated with :

The number of octahedral voids in a unit cell of cubic close packed structure is

The number of ions formed on dissolving one molecule of FeSO_4(NH_4)_2SO_46H_2O in water is:

The occurrence of reaction is impossible if

The obsrved osmotic pressure foe a 0.10 M solution of Fe (NH_(4))_(2) (SO_(4)) _(2) at 25^(@)C is 10.8 atm. The expected and experimental (observed) values of van't Hoff factor (i) will be respectively .

The number of ions formed in aqueous solution by the compound [Co(NH_3)_4CI_2]CI is:

The occurrence of a reaction is impossible if

The number of iodine atoms (N) present in 1 "cm"^(3) of its 0.1 M solution is

The number of iodine atoms present in 1cm^(3) of its 0.1 M solutions is :

The observed osmotic pressure of a solution of benzoic acid in benzene is less than its expected value because

Theobserveddepressionin thefreezingpointof waterfor aperticularsolutionis 0.087 K . Calculatethe molalityof thesolutionif molaldepressionconstantfor wateris 1.86 K kg mol^(-1)

The number of intermediates + transition states passible during the following reaction is ________

The observed angle of rotation of 2.0 gm sucrose containing 20 ml of aqueous solution in a polarimeter tube of 15 cm length is +15.3^(@). What is the specific rotation of this solution of sucrose ?

The number of incomplete orbitals in inner transition elements is:

The observed and calculated E^0 values for M^(+2)/M are same for

The no.of hydroxyl ions produced by one molecule of Na_(2)CO_(3) on hydrolysis is

The observed angle of rotation of 0.2 gm of Sucrose in 1 ml of aqueous solution in a Polarimeter tube 1 dm long is + 13.3^(@). What is the specific rotation of the solution of Sucrose ?

The observed and calculated E' values for M^(+2)//M are same for

The number of hydroxyl groups in pyrophosphoric acid is

The observation by Louis Pasteur that crystals of certain compounds exist in the form of mirror images laid the foundation of modern stereochemistry.

The O-O -H bond angle in H_(2)O_(2) is

The number of hydrogen bonds present in the sequence of a stretch of a double helical DNA 51 ATGCCTAA 3' is

The number of hydrogen atoms required to convert 1 mole of nitrobenzene to hydrazobenzene is

The O-O bond length in O_(3) is equal to that of

The number of hydrogen atoms present in 25.6 g of sucrose (C_(12)H_(22)O_(11)) which has a molar mass of 342.3 g is:

The number of hydrogen atoms attached to phsophorus atom in hypophosphorus acid is :

The number of H^(+) ions present in 1 ml of a solution whose pH is 13 is :

The number of [H] required to reduce with Sn-HCl to give aniline.

The O-O bond length in Ozone is

The number of gram molecules of a substance present in unit volume is termed as

The O - O bond length in H_2O_2 is :

The number of grams of H_(2)SO_(4) present in 0.25 mole of H_(2)SO_(4) is:

The nylon salt (Hexamethylenediammonium adipate) is

The number of gram molecules of oxygen in6.02 xx 10^24 CO molecules is :

The nutrient used in the body as a source of energy as a raw material for growthand repair is

The number of gram molecules of chlorine in6.02 xx 10^(25) hydrogen chloride molecules is

The number of gram atoms of oxygen in 0.2xx10^(24)CO molecules is

The number of protons, electrons and neutrons in ""_(17)^(35)Cl^(-) are respectively

The numerical value RT/PV for a gas at critical conditions is ………. Times of RT/PV at normal conditions:

The numerical value of N/n( where N is the number of molecules in a given sample of the gas and n is the number of moles of the gas ) is

The number of gram atoms of oxygen present in 0.25 g mole of (COOH)_2 2H_2Ois :