94420 + Interview Questions in Chemistry in Class 12

1.	If a certain oxide of nitrogen weighing 0.11 g gives 56 mL of nitrogen and another oxide of nitrogen weighing 0.15 g gives the same volume of nitrogen (both at sTP), show that these results support the law of multiple proportions.
Answer» Solution :22400 mL of `N_(2)` at STP weigh = 28 G. CALCULATE the mass of nitrogen. Then SUBSTRACT from the mass of oxide of nitrogen to calculate the mass of oxygen.

Discussion

2.	If a certain buffer solution contains equal concentration of X^- and HX. Then the pH of buffer will be (K_b for X^- is 10^-10)
Answer» 10 4 5 11 Answer :B

Discussion

3.	If a centi normal solution of NH_4OH has molar conductivity equal to 9.6 Omega^(-1) cm^(2) mol^(-1). what will be the per cent dissociation of NH_4OH at this dilution.
Answer» ANSWER :0.04

Discussion

4.	If a carbanion is bonded to hydrogen or an alkyl group then, the shape of methyl carbainon is likely to be
Answer» tetrahedral planar PYRAMIDAL linear Solution :They are formed by heterolytic fission. Due to presence of one LONE pair of electron on carbn atomis one of tetrahedral oriented, four `sp^(3)` HYBRIDE orbitals,the geometry of carbanion BECOME pyramidal.

Discussion

5.	If a be the edge length of the unit cell and r be the radius of an atom, then for fcc arrangement, the correct relation is
Answer» `4A = sqrt( 3) R` `4r = sqrt( 3) . a ` `4r = sqrt( 2) a ` ` 4 r = ( a)/( sqrt( 2))` ANSWER :C

Discussion

6.	If A, B, C and D are element's of 3^(rd) period of p-block in modern Periodic Table. Among these 'A' is a metal, 'B' is metalloid and 'C', 'D' are non metals and their order of electronegativity is given as rarr A lt B lt C lt D Which element is expected to form Amphoteric Oxide?
Answer» A B C D Solution :`._(25)Mn-1s^(2), 2s^(2),2p^(6),3S^(2),3p^(6),3d^(5),4s^(2)` `l+m=0implies""i.e "s-subshell"` `l=1, m=-1 ""i.e. "ONE orbital of p."` `l=2, m=-2 ""i.e. "one of d-orbitals."` Hence there are total of `13 e^(-)` having `l+m=0`

Discussion

7.	If a 6.84% (wt/vol.) solution of cane sugar (mol.wt.=342) is isotonic with 1.52%(wt/vol.) solution of thiocarbamide, then the molecular weight of thiocarbamide is:
Answer» 152 76 60 180 Answer :B

Discussion

8.	If a 0.1 M solution of HCN is 0.01 % ionised , the K_(a) for HCN is :
Answer» `10^(-9)` `10^(-7)` `10^(-5)` `10^(-3)` Answer :A

Discussion

9.	If a 0.1 M solution of glucose ( mol.wt. 180 ) and 0.1molarsolution of urea ( mol. wt. 60 ) are placedon the two sides of a semipermeable membrane to equal heights, then itwill be correct to say
Answer» There will be on net MOVEMENT across the MEMBRANE Glucose will FLOW across the membrane into urea SOLUTION Urea will flow across the membrane into glucose solution Water will flow from urea solution two flucose solution. Solution :Equimolar solution are isotonic.

Discussion

10.	If ._(92)U^(235) nucleus absorbs a neutron and disintegrates in ._(54)Xe^(139), ._(38)Sr^(94) and X, then what will be the product X
Answer» `alpha`-particle `beta-`particle `2-`neutrons `3-`neutrons Solution :`.^(92)U^(235) + ._(0)N^(1) rarr ._(54)Xe^(139) + ._(38)Sr^(94) + 3 ._(0)n^(1)`

Discussion

11.	If 9650 coulombs of electricity is passed through a copper sulphate solution, the number of moles of copper deposited will be
Answer» 3.15 2 0.05 0.01 Solution :`CU^(2+) + 2e^(-) to Cu THEREFORE 2F =2 XX 96500= 1` mole of Cu `therefore N= (1xx9650)/(2xx96500) =0.05` mole

Discussion

12.	If 965 coulombs of electricity is passed through a metal cup dipped in silver(l) salt solution, in order to plate it with silver. Then the amount of silver deposited on its surface is (Given : the molar mass of Ag = 108 g mol^(-1), 1F = 96500 coulombs)
Answer» `1.08 G` `1.002 g` `108 g` `9.89 g` ANSWER :A

Discussion

13.	If 9650 coulombs of electricity is passed through a copper sulphate solution , the number of moles of copper deposited will be _________.
Answer» 0.05 0.01 2 3.15 Answer :A

Discussion

14.	If ._(92)U^(236) nucleus emits one alpha-particles, the remaining nucleus will have
Answer» 119 neutrons and 119 protons 142 neutrons and 90 protons 144 neutrons and 92 protons 146 neutrons and 90 protons Solution :`._(92)U^(236) rarr ._(90)X^(232) + ._(2)He^(4)` `._(90)X^(232)` have 90 protons and 142 neutrons

Discussion

15.	If 900 J/g of heat is exchanged at boiling point of water, then what is increase in entropy
Answer» `43.4 J//mol` `87.2 J//"mole"` `900 J//"mole"` Zero Solution :`DeltaS_("vap")=((900xx18))/(373)=43.4 JK^(-1) mol^(-1)`.

Discussion

16.	If 90 g of water is electrolysed completely with 50% current efficiency 10 faraday of electricity will be consumed 20 faraday of electricity will be consumed c) 168 L (STP) of gases will be produced d) 84 L (STP) of gases will be produced. Correct statements are
Answer» B, C a, b, c a, c, d All ANSWER :A

Discussion

17.	IF 900 J/g of heat is exchanged at boiling point of water then increase in entropy is
Answer» 43.4 J/MOL K 87.2 J/mol K 900 J/mol K zero Solution :`DeltaS_(VAP)=((900xx18))/(373)=43.4JK^(-1)mol^(-1)`

Discussion

18.	If 8.3mL of a sample of H_(2)SO_(4) (36 N) is diluted by 991.7 mL of water required 19.8 mL of 0.1 N HCl .The value of x is
Answer» `0.4` `0.2` `0.1` `0.3` ANSWER :d

Discussion

19.	If 772 mL of SO_(2) gas at STP is adsorbed on 2 g of charcoal at an equlibrium pressure of 16 atmospheres and the value of the constant 'k' in the Freundlich equation is 0.48. the value of the constant 'n' will be
Answer» Solution :Molar mass of `SO_(2)=64 G mol^(-1)` Moar volume at `STP=22400mL` `THEREFORE` ML of `SO_(2)` at STP well have mass `=(64)/(22400)xx772=1.92g` `therefore x/m=(1.92)/(2)=0.96` But `x/m=kP^(1//n)` `therefore 0.96 =0.48 xx(16)^(1//n) or 2=(16)^(1//n)` `therefore n=4.`

Discussion

20.	If 8.2g of anhydrous sodium acetate is added to 11 of 0.l(M) acetic acid solution, then what will be the change in degree of ionisation of the acid? [Given: K_1(CH_3COOH)=1.8xx10^(-5)]
Answer» SOLUTION :If the degree of dissociation of monobasic acid, HA in its aqueous solution `=prop`, MOLAR concentration=c(M) and dissociation constant of the acid`=K_a`, then `K_a=(prop^2c)/(1-prop)` Let the solution is x times diluted. Hence, `c=(0.1)/(x)(M)` As given, degree of ionisation of HA in the dilute solution`=2prop` `:.2prop=sqrt((K_a)/((0.1//x)))=sqrt((x xxK_a)/(0.1))` From [1] & [2], `2xxsqrt((K-a)/(0.1))=sqrt((x xxK-a)/(0.1))` or `sqrtx=2` `:.x=4` Therefore, if the solution is diluted 4 times, then degree of dissociation of HA in the diluted solution will be 2 times that of the initial solution.

Discussion

21.	If 720 litres of a gas were collected over water at 25^(@)C and 720 mm then the volume of the dry gas at the same temperature and pressure is (aq. Tension of water at 25^(@)C = 23.8 mm)
Answer» 696.2 litres 360 litres 743.8 litres 1440 litres Answer :A

Discussion

22.	If 75% quantity of a radioactive isotope disintegrates in 2 hour , its half-life would be :
Answer» 1 hour 45 MINUTES 30 minutes 15 minutes SOLUTION :`100% overset(1hr) (to) 50% overset(1 hr) 25% , t = 2` HRS

Discussion

23.	If 7% of a first order reaction was completed in 60% of the same reaction under the same conditions would be completed in.........
Answer» 20 minutes 30 minutes 35 minutes 75 minutes Solution :`t_(75%)=2t_(50%)` `t_(50%=((t_(75%))/2))=(60/2)= 30` MIN

Discussion

24.	If 6gm of CH_(3)COOH is dissoved in benzene to make 1 litre at 300K. Osmotic pressure of solution is found to be 1.64 atm. If it is known that CH_(3)COOH in benzene forms a dimer. Calculate degree of association of acetic acid in benzene?
Answer» SOLUTION : `i=1+((1)/(n)-1)beta` `1.64=0.0821xx300xx[1+((1)/(n)-1)beta]xx0.1` `RARR 1.64=0.0821xx300[1-(beta)/(2)]0.1` `(1.64)/(00.821xx30)=(2-beta)/(2)` `(1.64)/(2.46)=(2-beta)/(2) 4=6.3beta` `beta=(2)/(3)`

Discussion

25.	If 6.3 g of NaHCO_(3) are added to 15.0 g of CH_(3)COOH solution, the residue is found to weigh 18.0 g. The mass of CO_(2) released in the reaction is
Answer» 9.3 g 39.3 g 3.3 g None of these Solution :`CH_(3)COOH+NaHCO_(3) to CH_(3)COONa+H_(2)O+CO_(2) UARR` Mass of reactants = Mass of PRODUCTS `6.3 g + 15.0 g= 18.0 g+` Mass of `CO_(2)` Mass of `CO_(2) = 6.3g + 15.0g - 18.0 g = 3.3 g`

Discussion

26.	If 61.25 gm of K ClO_(3) reacts with excess of red phosphorus, what mass of tetraphosphorous dioxide (P_(4) O_(10)) would be produced. K ClO_(3) (s) + P_(4) (s) rarr P_(4) O_(10) (s) + K Cl (s)
Answer» `142 gm` `426 gm` `14.2 gm` `32.6 gm` Solution :`10 KClO_(3) (s) + 3P_(4) (s) rarr 3 P_(4)O_(10) (s) + 10 KCl (s)` `61.25 gm` `N = (61.25)/(122.5)` `{:(n = (1)/(2) " mole" ,n = (3)/(10) xx (1)/(2),),(,n = (3)/(20) " mole",):}` mass of `P_(4)O_(10) = (3)/(20) (3 1 xx 4 + 10 xx 16)` `= (3)/(20) (284)` `= 14.2 xx 3` `= 32.6 gm`

Discussion

27.	If 6.3 g of NaHCO_(3) are added to 15.0 g of CH_(3)COOH solution, the residue is found to weigh 18.0 g. What is the mass of CO_(2) released in the reaction?
Answer» ANSWER :3.3 G

Discussion

28.	If 6.022xx10^(23) atoms are present in 100 mL of urea solution then find out the molarity of urea solution.
Answer» ANSWER :0.01 M

Discussion

29.	If 6.022xx10^(20) molecules are present in 100 mL urea solution, then find out the concentration of urea solution.
Answer» 0.01 M 0.001 M 0.2 M 0.1 M Solution :Mole `= 10^(-3)` `6.022xx10^(23)` molecule urea = 1 mole urea `6.022xx10^(20)` molecule urea = (?) `THEREFORE M=(10^(-3))/(0.1("liter"))=0.01M`

Discussion

30.	If 60% of a first order reaction was completed in 60 minutes 50% of the same reaction would be completed in approximately :
Answer» 45 minutes 60 minutes 40 minutes 50 minutes . Solution :(A) `k = (2.303)/(t) "log"([A]_(0))/([A])` `:. K = (2.303)/(60) "log" ([A]_(0))/(0.4[A]_(0))` `= (2.303)/(60) "log" (10)/(4)` `= (2.303)/(60) ` (log 10 -log 4) Now `t_(1//2) = (0.693)/(k) = (0.693xx60)/(2.303xx0.4)` `= 45.14 ~~45 ` min .

Discussion

31.	If 6 litre of H_(2) of Cl_(2) are mixed and exploded in an eudiometer, the volume of HCl formed is:
Answer» 6.0 litre 5.6litre 11.2 litre 11.6 litre Answer :C

Discussion

32.	If 60% of a first order reaction was completed in 60 minutes , 50% of the same reaction would be completed in approximately
Answer» 50 MINUTES 45 minutes 60 minutes 40 minutes Solution :`K = (2.303)/(60) "LOG" (100)/(40) implies 0.152` `k = (0.693)/(T_(1//2)) T_(1//2) = (0.693)/(0.152) = 45.37` min .

Discussion

33.	If 60 cm^(3) of ethyl alcohol is mixed in water to form 360 cm^(3) of dilute ethyl alcohol solution, then the percentage by volume of ethyl alcohol in water is _________.
Answer» `16.67%` `17.05%` `17.86%` `18.96%` ANSWER :A

Discussion

34.	If 60% of a first order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately
Answer» `45` MIN `60` min `40` min `50` min Answer :A

Discussion

35.	If 5g of a radioactive substance has a t_((1)/(2))=14h, 20g of the same substance will have a t_((1)/(2)) equal to
Answer» 56h 3.5h 14h 28h Answer :C

Discussion

36.	If 5.85 gms of NaCl are dissolved in 90 gms of water, the mole fraction of NaCl is
Answer» `0.1` `0.2` `0.3` `0.0196` Solution :`5.85 G NaCl=(5.85)/(58.5)` mole = 0.1 mol `90 g H_(2)O=(90)/(18)` MOLES = 5 moles mole fraction of NaCl = `(0.1)/(5+0.1)~~0.0196`.

Discussion

37.	If 5.85 gm of NaCl is dissolved in 90 gm of water, then find out the mole fraction of NaCl.
Answer» ANSWER :`0.0196`

Discussion

38.	If 54 g of silver is deposited during an electrolysis reaction, how much aluminium will be deposited by the same amount of electric current?
Answer» (a) 2.7 G (b) 4.5 g (C) 27 g (d) 5.4 g Solution :1 F DEPOSITS 108 g of Ag `(Ag^(+) + e^(-) to Ag )` 54 g of Ag will be deposited by `1/108xx54=1/2F` 3 F deposite 27 g of Al (`Al^(3+) + 3E^(-) to Al`) `1/2F` will deposit `27/3xx1/2`=4.5 g of Al

Discussion

39.	If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity the solution obtained?
Answer» `1.5M` `1.66M` `0.017M` `1.59M` Solution :`{:(""M_(1)V_(1),=,""M_(2)V_(2),therefore5xx500=M_(2)xx1500orM_(2)=(5)/(3)=1.66M),("(Before DILUTION)",,"(After dilution)",):}`

Discussion

40.	If 50% of a radioactive substance has t_(1//2) = 14 hr , 2 g of the same substance will have a t_(1//2) equal to
Answer» 56 HR 3.5 hr 14 hr 28 hr SOLUTION :`t_((1)/(2))` = contain for a NUCLEIDE

Discussion

41.	If 50 % of the reactant is converted into a product in first order reaction in 25 minutes how much of it would react in 100 minutes ?
Answer» 93. 75 % `87.5%` `75%` `100 % ` Solution :`t_(1//2) = 25` MIN Number of half - lives in 100 min =`(100)/(25)=4` `:.` FRACTION of substance remaining after 100 min `= (1)/(2^(4)) = (1)/(16)` Thefraction of substance REACTED in 100 min . `= 1- (1)/(16)=(15)/(16)=0.9375` % of substance reacted = 93.75 %

Discussion

42.	If 50 ml of A_(2)B_(3) reacts completely with 200 ml of C_(2) in closed vessel according to the equation , 2A_(2)B_(3)(g)+5C_(2)(g) to 3C_(3)B_2(g)+CA_(4)(g) . The composition of the mixtureof gasesis :
Answer» 10 ml ` C_(2)` , 25 ml `C_(3)B_(2)`, 100 ml `CA_(4)` 25 ml `C_(2)`, 75 ml ` C_(3),B_2,` 25 ml ` CA_(4)` 75 ml ` C_(2)`, 75 ml ` C_(3)B_(2)`, 25 ml ` CA_(4)` 100 ml `C_(2)`, 50 ml `C_(3)B_(2)`, 50 ml `CA_(4)` SOLUTION :The MOLE ratio is`UNDERSET("Reaction")(2:5)::underset("Product")(3:1)`

Discussion

43.	If 50 ml of each 1 M NaOH are mixed then correct option is
Answer» I,I, R l,ii,R IV,iii,S I,ii,Q Solution :`pH=(pK_(a_1)+pK_(a_2))/2=(5+7)/2=6`

Discussion

44.	If 50 of 1 M H_3X mixed with 150 mL of 1 M NaOH then correct option is
Answer» II, I,P IV,ii,S IV,III,S II,I,P Solution :`[Na_3X]=50/200=0.25 M` `pH=7+1/2pK_(a_3)+1/2logC` =11.2

Discussion

45.	If 50% of the reactant is converted into a product in a first order reaction in 25 minutes, how much of it would react in 100 minutes?
Answer» 0.9375 0.875 0.75 1 Solution :Half-life is 25 mins `100 OVERSET(25"min")RARR 50 overset(25"min")rarr 25 overset(25"min")rarr 12.5 overset(25 "min")rarr 6.25` 6.25% remaining i.e., 93.75% REACTED.

Discussion

46.	If 50 ml of 1 M H_3X and 25 mL of 1 M NaOH mixed then correct option is-
Answer» I,IV,Q II,ii,P IV,iii,S I,iii,Q Solution :`pH=5+log(25/25)=5`

Discussion

47.	If 50 ml of 0.2 M KOH is added to 40 ml of 0.5 M HCOOH, the pH of the resulting solution is (K_(a) = 1.8 xx 10^(-4))
Answer» 3.4 7.5 5.6 3.75 Answer :A

Discussion

48.	If 50 mL of 0.2 M KOH is added to 40 mL of 0.5 M HCOOH. Find the resulting solution. (K_c = 1.8 xx 10^-4) :
Answer» 3.75 5.6 7.5 3.4 Answer :A

Discussion

49.	If 50 milli ampere of current is passed through copper coulometer for 60 min, calculate the amount of copper deposited.
Answer» Solution :ELECTRICAL charge input `=Ixx"t coulombs"` `=50xx10^(-3)Axx60xx60sec` `="180 coulombs."` The chemical reaction is, `Cu^(2+)+2E rarr Cu_((s))` 1 gm atom of COPPER requires 2F CURRENT `therefore" AMOUNT of copper deposted "=(63.5g.mol^(-1)xx180C)/(2xx96500C)` `=0.0592gm.`

Discussion

50.	If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option is
Answer» The resulting solution contains 18 gm of water and 118 gm `H_(2)SO_(4)` The resulting solution contains 9 gm water and 59 gm `H_(2)SO_(4)` The resulting solution contains only 118 gm pure `H_(2)SO_(4)` The resulting solution contains 68 gm of pure `H_(2)SO_(4)` Answer :B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If a certain oxide of nitrogen weighing 0.11 g gives 56 mL of nitrogen and another oxide of nitrogen weighing 0.15 g gives the same volume of nitrogen (both at sTP), show that these results support the law of multiple proportions.

If a certain buffer solution contains equal concentration of X^- and HX. Then the pH of buffer will be (K_b for X^- is 10^-10)

If a centi normal solution of NH_4OH has molar conductivity equal to 9.6 Omega^(-1) cm^(2) mol^(-1). what will be the per cent dissociation of NH_4OH at this dilution.

If a carbanion is bonded to hydrogen or an alkyl group then, the shape of methyl carbainon is likely to be

If a be the edge length of the unit cell and r be the radius of an atom, then for fcc arrangement, the correct relation is

If A, B, C and D are element's of 3^(rd) period of p-block in modern Periodic Table. Among these 'A' is a metal, 'B' is metalloid and 'C', 'D' are non metals and their order of electronegativity is given as rarr A lt B lt C lt D Which element is expected to form Amphoteric Oxide?

If a 6.84% (wt/vol.) solution of cane sugar (mol.wt.=342) is isotonic with 1.52%(wt/vol.) solution of thiocarbamide, then the molecular weight of thiocarbamide is:

If a 0.1 M solution of HCN is 0.01 % ionised , the K_(a) for HCN is :

If a 0.1 M solution of glucose ( mol.wt. 180 ) and 0.1molarsolution of urea ( mol. wt. 60 ) are placedon the two sides of a semipermeable membrane to equal heights, then itwill be correct to say

If ._(92)U^(235) nucleus absorbs a neutron and disintegrates in ._(54)Xe^(139), ._(38)Sr^(94) and X, then what will be the product X

If 9650 coulombs of electricity is passed through a copper sulphate solution, the number of moles of copper deposited will be

If 965 coulombs of electricity is passed through a metal cup dipped in silver(l) salt solution, in order to plate it with silver. Then the amount of silver deposited on its surface is (Given : the molar mass of Ag = 108 g mol^(-1), 1F = 96500 coulombs)

If 9650 coulombs of electricity is passed through a copper sulphate solution , the number of moles of copper deposited will be _________.

If ._(92)U^(236) nucleus emits one alpha-particles, the remaining nucleus will have

If 900 J/g of heat is exchanged at boiling point of water, then what is increase in entropy

If 90 g of water is electrolysed completely with 50% current efficiency 10 faraday of electricity will be consumed 20 faraday of electricity will be consumed c) 168 L (STP) of gases will be produced d) 84 L (STP) of gases will be produced. Correct statements are

IF 900 J/g of heat is exchanged at boiling point of water then increase in entropy is

If 8.3mL of a sample of H_(2)SO_(4) (36 N) is diluted by 991.7 mL of water required 19.8 mL of 0.1 N HCl .The value of x is

If 772 mL of SO_(2) gas at STP is adsorbed on 2 g of charcoal at an equlibrium pressure of 16 atmospheres and the value of the constant 'k' in the Freundlich equation is 0.48. the value of the constant 'n' will be

If 8.2g of anhydrous sodium acetate is added to 11 of 0.l(M) acetic acid solution, then what will be the change in degree of ionisation of the acid? [Given: K_1(CH_3COOH)=1.8xx10^(-5)]

If 720 litres of a gas were collected over water at 25^(@)C and 720 mm then the volume of the dry gas at the same temperature and pressure is (aq. Tension of water at 25^(@)C = 23.8 mm)

If 75% quantity of a radioactive isotope disintegrates in 2 hour , its half-life would be :

If 7% of a first order reaction was completed in 60% of the same reaction under the same conditions would be completed in.........

If 6gm of CH_(3)COOH is dissoved in benzene to make 1 litre at 300K. Osmotic pressure of solution is found to be 1.64 atm. If it is known that CH_(3)COOH in benzene forms a dimer. Calculate degree of association of acetic acid in benzene?

If 6.3 g of NaHCO_(3) are added to 15.0 g of CH_(3)COOH solution, the residue is found to weigh 18.0 g. The mass of CO_(2) released in the reaction is

If 61.25 gm of K ClO_(3) reacts with excess of red phosphorus, what mass of tetraphosphorous dioxide (P_(4) O_(10)) would be produced. K ClO_(3) (s) + P_(4) (s) rarr P_(4) O_(10) (s) + K Cl (s)

If 6.3 g of NaHCO_(3) are added to 15.0 g of CH_(3)COOH solution, the residue is found to weigh 18.0 g. What is the mass of CO_(2) released in the reaction?

If 6.022xx10^(23) atoms are present in 100 mL of urea solution then find out the molarity of urea solution.

If 6.022xx10^(20) molecules are present in 100 mL urea solution, then find out the concentration of urea solution.

If 60% of a first order reaction was completed in 60 minutes 50% of the same reaction would be completed in approximately :

If 6 litre of H_(2) of Cl_(2) are mixed and exploded in an eudiometer, the volume of HCl formed is:

If 60% of a first order reaction was completed in 60 minutes , 50% of the same reaction would be completed in approximately

If 60 cm^(3) of ethyl alcohol is mixed in water to form 360 cm^(3) of dilute ethyl alcohol solution, then the percentage by volume of ethyl alcohol in water is _________.

If 60% of a first order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately

If 5g of a radioactive substance has a t_((1)/(2))=14h, 20g of the same substance will have a t_((1)/(2)) equal to

If 5.85 gms of NaCl are dissolved in 90 gms of water, the mole fraction of NaCl is

If 5.85 gm of NaCl is dissolved in 90 gm of water, then find out the mole fraction of NaCl.

If 54 g of silver is deposited during an electrolysis reaction, how much aluminium will be deposited by the same amount of electric current?

If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity the solution obtained?

If 50% of a radioactive substance has t_(1//2) = 14 hr , 2 g of the same substance will have a t_(1//2) equal to

If 50 % of the reactant is converted into a product in first order reaction in 25 minutes how much of it would react in 100 minutes ?

If 50 ml of A_(2)B_(3) reacts completely with 200 ml of C_(2) in closed vessel according to the equation , 2A_(2)B_(3)(g)+5C_(2)(g) to 3C_(3)B_2(g)+CA_(4)(g) . The composition of the mixtureof gasesis :

If 50 ml of each 1 M NaOH are mixed then correct option is

If 50 of 1 M H_3X mixed with 150 mL of 1 M NaOH then correct option is

If 50% of the reactant is converted into a product in a first order reaction in 25 minutes, how much of it would react in 100 minutes?

If 50 ml of 1 M H_3X and 25 mL of 1 M NaOH mixed then correct option is-

If 50 ml of 0.2 M KOH is added to 40 ml of 0.5 M HCOOH, the pH of the resulting solution is (K_(a) = 1.8 xx 10^(-4))

If 50 mL of 0.2 M KOH is added to 40 mL of 0.5 M HCOOH. Find the resulting solution. (K_c = 1.8 xx 10^-4) :

If 50 milli ampere of current is passed through copper coulometer for 60 min, calculate the amount of copper deposited.

If 50 gm oleum sample rated as 118% is mixed with 18 gm water, then the correct option is