94420 + Interview Questions in Chemistry in Class 12

1.	How much water should be added to 100 ml of1MH_(2)SO_(4) solution to make it exactly 0.1 N ?
Answer» 1200 ml 400 ml 1800 ml 1900 ml Solution :100 ml of 1M `H_(2)SO_(4)=100` ml of `2N H_(2)SO_(4)` Applying `N_(1)V_(1)=N_(2)V_(2)` `2xx200=0.1xxV_(2)` or `V_(2)=(1xx200)/(0.1)=2000` ml Amt. of water to be ADDED `=2000-100` `=1900` ml.

Discussion

2.	How much volume of oxygen will be required for complete combustion of 40 mL of acetylene (C_(2)H_(2)) and how much volume of carbon dioxide will be formed? All volumes are measrued at NTP.
Answer» Solution :`{:(2C_(2)H_(2),+,5O_(2),=,4CO_(2),+,2H_(2)O),("2vol",,"3vol",,"4vol",,),(40mL,,(5)/(2)xx40mL,,(4)/(2)xx40mL,,),(40mL,,100mL,,80,,):}` So, for complete combustion of 40mL of acetylene, 100 mL of OXYGEN are required and 80mL of CARBON dioxide is formed.

Discussion

3.	How much urea must be dissolved in 10^(-2)m^(3) water to yield a pressure is 2.03xx10^(5)Nm^(-2) at 300K?
Answer» 48.30 g 60.0 g 24.15 g 48.03 g Solution :OSMOTIC PRESSURE `=2.03xx10^(5)NM^(-2)` `pi=CRT` `2xx10^(5)=m/60xx1000=80.186xx60xx0.01g` in `0.01m^(3)=48.3gimplies1J=1Nm`

Discussion

4.	How much urea (molar mass = "60 g mol"^(-1)) should be dissolved in 50 g of water so that its vapour pressure at room temperature is reduced by 25%. Calculate molality of the solution obtained.
Answer» Solution :If `p^(@)=100mm, p_(s)=75MM`. Hence, `=(100-75)/(100)=(w_(2)//60)/(50//18+w_(2)//60).` This gives `w_(2)=55.556g` `"Molality of the solution "=(55.556//"60 mol")/(50 g)xx1000g KG^(-1)=18.52m`

Discussion

5.	How much time would it take in minutes to deposit 1.18 g of metallic copper on a metal object when a current of 2.0 A is passed through the electrolytic cell containing Cu^(2+) ions? [Molar mass of Cu = 63.5 g mol^(-1), 1F = 96,500 Cmol^(-1)]
Answer» SOLUTION :`m = Z xx I xx t` `1.18 = (63.5)/(2 xx 96500) xx 2 xx t` `t = (1.18 xx 2 xx96500)/(2 xx 63.5)` `= 1793.23` SEC `= (1793.23)/(60) = 29.88` min.

Discussion

6.	How much type of colloidal systems can be formed on the basis of physical state of dispersion medium and dispersion phase ?
Answer» Two Three Nine EIGHT SOLUTION :Eight

Discussion

7.	How much time would be needed to deposit 0.25 g of metallic nickel. (Atomic mass = 58.5) on a metal object using a current of 1A during electroplating?
Answer» Solution :`Ni^(++) + 2e^(-) to Ni` 2F or `2 xx 96500` C of electricity is required to deposit 58.5 g of Ni. 58.5 g of Ni REQUIRES `2 xx 96500` C 0.25 g Ni requires `=(2 xx 96500 xx 0.25)/58.5 = 824.8` C Amount of electricity = CURRENT in amperes `xx` time in SECONDS Time in seconds `=("Amount of electricity")/("Current in amperes")` `=824.8/1 = 824.8 sec = 13.74` MINUTES.

Discussion

8.	How much time in minutes passes between 99% to 99.9% completion of a first order reaction with half life 0.3010"min"^(-1)?
Answer» SOLUTION :`(0.693/0.3010)xxt_(1)=2.303xxlog(100/1)t_(1)=2,0.693/0.310xxt_(2)=2.303xxlog(100/0.1)t_(2)=3` `DELTA=(t_(2)-t_(1))=(3-2)=1,Deltat=1`

Discussion

9.	How much time (in hours ) would it take to distribute one avogardo number of wheat grains if 10^20 grains are distributed each second ?
Answer» 0.1673 1.673 16.73 167.3 Solution :Time TAKEN to DISTRIBUTE `10^20` GRAINS = 1 second Time taken to distribute `6.022 XX 10^23`grains ` = (1)/(10^20) xx 6.022 xx 10^23 ` seconds ` = (6.022 xx 10^23)/(10^20 xx 60 xx 60) ` hours = 1.673 hours

Discussion

10.	How much time (in hours) is required for a current of 2 amp to decompose electrolytically 18g of water.
Answer» ANSWER :26.8

Discussion

11.	How much time is required for completion of a zero order reaction?
Answer» `(2[R_(o)])/(K)` `[R_(o)]/(2K)` `([R_(o)])/(K)` `(K)/([R_(0)])` ANSWER :C

Discussion

12.	How much sulphur is present in organic compoundif on analysis 0.53 gmof thiscompound gives 1.158 gm of BaSO_(4).
Answer» `10%` `15%` `20%` `30%` Solution :Percentage of sulphur `= (32)/(233) xx (" MASS of" BaSO_(4))/(" mass of ORGANIC compound") xx 100` `= (32)/(233) xx (1.158)/(0.53) xx 100 = 30%`.

Discussion

13.	How much sulpher is present in the rubber used for tyres ?
Answer» `5 %` `10 %` `20 %` `30 %` SOLUTION :`5 %`

Discussion

14.	How much sulphur is added during vulcanization to get rubber for tyre ?
Answer» `30 %` `5%` `55%` `3 %` SOLUTION :`5 %`

Discussion

15.	How much sulpher is present in the rubber used for bettery case ?
Answer» `5%` `30 %` `20 %` `50 %` SOLUTION :`30 %`

Discussion

16.	How much sugar (C_(12)H_(22)O_(11)) will be required if each person on the earth is given 100 molecules of sugar? The population of the earth is 3xx10^(10).
Answer» ANSWER :`170.43xx10^(-11)G`

Discussion

17.	How much sodium chloride be dissolved in water to make 1 litre of 0.1 F solution ?
Answer» Solution :Gram formula MASS NaCI=23+35.5=58.5 G `("Formula mass")^(-1)` VOLUME OS solution = L Formality of solution = 0.1 F=0.1 (Formula mass)/LITRE `"Formality (F)"=("Mass os NaCI/Gram formula mass")/("Volume of solution in litres")` `"0.1 (Formula mass/litre)"=W/(58.5 "g (Formula mass)"^(-1)xx1L)` `W=0.1 ("Formula mass/L")xx58.5 g("Formula mass")^(-1)xx1L` ` W=0.1xx58.8 g= 5.85 g`.

Discussion

18.	How much sodium acetate should be added to a 0.1 M solution of CH_(3)COOH to give a solution of pH = 5.5 (pK_(a) of CH_(3)COOH = 4.5)
Answer» 0.1 M 0.2 M `1.0 M` `10.0 M` SOLUTION :`pH = pK_(a) + log.(["Salt"])/("Acid") , 5.5 = 4.5 + log.(["Salt"])/("Acid")` `log.(["Salt"])/("Acid") = 5.5 - 4.5 = 1` `(["Salt"])/(0.1) = "antilog 1" = 10, ["Salt"] = 1` .

Discussion

19.	How much should the pressure be increased in order to decrease the volume of a gas 5% at a constant temperature ?
Answer» <P>0.05 `5.26 %` 0.1 `4.26 %` Solution :PV = a constant New volume =0.95 V `therefore P_(1)V=P_(2)xx0.95 V` `P_(2)=(P_(1))/(0.95)=1.0526P_(1)` `therefore` INCREASE in pressure `=1.0526P_(1)-P_(1)` `=0.0526P_(1)` `=5.26%" of "P_(1)` HENCE, (B) is the correct answer.

Discussion

20.	How much quantity of electricity present on 1 electron in coulomb ?
Answer» `6.02xx10^(23)` `6.02xx10^(19)` `1.602xx10^(-19)` `0.1602xx10^(-20)` SOLUTION :`0.1602xx10^(-20)`

Discussion

21.	How much quantity of electricity is required to liberated 1 g equivalent weight of an element ?
Answer» 96,500 Faradays 96,500 Coulombs 96,500 AMPERES 96,500 gram Answer :B

Discussion

22.	How much quantity of electricity has to be passed through 200 mL of 0.5 M CuSO_(4) solution to completely deposite copper ?
Answer» 96500 C `2 XX 9650 C` `2 xx 96500 C ` `4 xx 96500 C` Solution :200 ml of 0.5 M `CuSO_(4)` CONTAINS `CuSO_(4)` = 0.1 mole . `Cu^(2+) + 2E^(-) to Cu` To deposit 0.1 mole of `Cu^(2+)` , electricity required = `2XX 9650` C

Discussion

23.	How much Pt is deposited on cathode when 0.80F current is pass through 1.0 M solution of Pt^(4+) ?
Answer» 1.0 MOLE 0.20 mole 0.40 mole 0.80 mole Solution :`PT^(4+) +4E^(-) to Pt` `4F=1` mole Pt `THEREFORE 0.80F=(?)` `=(1xx0.80)/(4)=0.20` mole.

Discussion

24.	How much propanol is required for dehydration to get 2.24 litre of propene at N.T.P. If yield is 100%
Answer» Solution :`C_(3)H_(8)O+H_(2)SO_(4)rarrC_(3)H_(6)+H_(2)O+H_(2)SO_(4)` Molecular weight of propanol `=60` from the equation given above we can see that from dehydration of `1` mole or `60` GRAM of propanol we get `1` mole (`22.4`lit) of PROPENE as PRODUCT. `because 22.4` litre of `C_(3)H_(6)` can be get from dehydration of `60g` of propanol. `therefore 1` litre of propene can be get from dehydration of `(60)/(22.4)g` of propanol

Discussion

25.	How much PCl_(5) must be added to one litre volume reaction vessel at 250^(@)C in order to obtain a concentration of 0.1 mole of Cl_(2),K_(c) for PCl_(5)hArrPCl_(3)+Cl_(2) is 0.0414" mol dm"^(-3) at 250^(@)C.
Answer» ANSWER :`0.341` MOLES `PCl_(5)`

Discussion

26.	How much PCl_(5) must be added to one litre volume reaction vessel at 250^(@)C in order to obtain a concentration of 0.1 mole of Cl_(2),K_(c) for PCl_(5)hArrPCl_(5)+Cl_(2) is 0.0414" mol dm"^(-3) at 250^(@)C.
Answer» ANSWER :`0.341` MOLES `PCl_(5)`

Discussion

27.	How much oxygen is required for complete combustion of 560 g of ethene (Mw = 28 g/mol) ?
Answer» 6.4 KG 1.92 kg 2.8 kg 9.6 kg SOLUTION :C2H4(G) + 3O2(g) `hArr` 2CO2(g) + 2H2O(ℓ) `(560)/(28) mol `

Discussion

28.	How much of sulphur is present in an organic compound, if 0.53g compound gave 1.158g of BaSO_(4) analysis?
Answer» 0.1 0.15 0.2 0.25 Answer :C

Discussion

29.	How much of NaOH is required to neutralise 1500cm^(3) of 0.1 N HCl ? (Na = 23)
Answer» 40 G 4 g 6 g 60 g Solution :`1500cm^(3)" of of 0.1 N HCl"-=(0.1)/(1000)xx1500="0.15 g eq."` It will neutralise `NaOH=0.15" g eq."=0.15xx40g=6g`

Discussion

30.	How much of NaOH is required to neutralise 1500 cm^(3)of 0.1 N HCI? (Na = 23)
Answer» 40 G 4 g 6 g 60 g Solution :`1500 cm^(3)` of 0.1 N HCL `=0.1/1000 xx 1500 = 0.15` g eq. It will NEUTRALISE `NaOH = 0.15 g eq. = 0.15 xx 40 g = 6 g`

Discussion

31.	How much of NaOH is required to neutralise 1500 cm^(3) of 0.1N HCl? (Na= 23)
Answer» 4g 40g 60g 6g Solution :As, `(W)/(E.W) = (V XX N)/(1000)` E.W (NaOH) = 40M V= 1500 `cm^(3)`, N= 0.1 N, W= ? `rArr W= (1500 xx 0.1 xx 40)/(1000) rArr W= 6gm`

Discussion

32.	How much of Fe can be theoretically obtained by the reaction of 1 kg of Fe_(2)O_(3)?
Answer» SOLUTION :`underset(2xx56+3xx16=160g)(Fe_(2)O_(3))-=underset(2xx56=112g)(2Fe)`

Discussion

33.	How much moles of oxidizing agents are reduced by complete reaction of 63.5 gm of Cu with concentrated HNO_(3) solution ? (Atomic weight of Cu=63.5 gm mol^(-1))
Answer» 8 4 2 1 Answer :C

Discussion

34.	How much minimum volume (in ml) of ((5)/(51)) M aluminium sulphate solution should be added to excess calcium nitrate to obtain atleast 1 gm of each salt in the reaction Al_(2) (SO_(4))_(3) + 2Ca(NO_(3))_(2) rarr 2Al(NO_(3))_(3) + 3CaSO_(4)
Answer» ANSWER :25 ML

Discussion

35.	How much NaOH is required to prepare 10% w/w 500 gram solution of NaOH ?
Answer» 0.5 GRAM 100 gram 5.0 gram 50 gram Solution :`%(W)/(w)=(100xx"mass of solute")/("mass of solution")` `THEREFORE 10=(100xx"mass of solute")/(500)` `therefore` Mass of solute `= (10xx500)/(100)=50` gram.

Discussion

36.	How much molecular mass of NaCl is obtained experimentally using colligative properties?
Answer» SOLUTION :As CONCENTRATION of particles in the solution is doubled, value of COLLIGATIVE property is double than expected value and hence molecular mass is HALVED, i.e. OBSERVED molecular mass = 58.5/2 = 29.25

Discussion

37.	How much methanol should be added to water, to make 150 mL. 2 M solution of CH_(3)OH ?
Answer» 9.6 gram 2.4 gram `9.6xx10^(3)` gram `4.3xx10^(2)` gram Solution :1000 mL 1 M `CH_(3)OH=32` gram `therefore 150 mL 2M CH_(3)OH= ?` `= (32xx150xx2)/(1000)=9.6` gram.

Discussion

38.	How much marble of 96.5% purity would be required to prepare 10 litres of carbon dioxide at STP when the marble is acted upon by dilute hydrochloric acid?
Answer» Solution :`underset(100g)(CaCO_(3))+2HCL rarrCaCl_(2)+H_(2)O+underset("22.4 at STP")(CO_(2))` 10 L of `CO_(2)` at STP will be obtained from pure `CaCO_(3)=(100)/(22.4)xx10=44.64g` `"Impure marble required "=(100)/(96.5)xx44.64=46.26g`

Discussion

39.	How much marble mainly [CaCO_(3)] " of " 96 . 5%purity would be required to prepare 10 litres of CO_(2) at STP when the marble is acted upon by dilute HCl ?
Answer» SOLUTION :N/A

Discussion

40.	How much litres of dihydrogen gas will be produced at STP in the reaction of ethanol with 12 gram of Mg ? (Mg = 24 gram//mol)
Answer» 11.2 LITER 2.24 liter 22.4 liter 5.6 liter Solution :11.2 liter

Discussion

41.	How much is the oxidising power of the MnO_4^(-) (1M)\|Mn^(2+) (1M) couple decreased if the H^+ concentration is decreased from 1M to 10^-4 M at 25^@C
Answer» Solution :The HALF cell REACTION is `MnO_4^(-) +8H^+ +5e=Mn^(2+)+4H_2O` Let us suppose that only the `H^+` concentration deviates from 1mole`//` litre `E_(MnO overline4. Mn^(2+))=E_(MnO_4^-,Mn^(2+))- 0.0591/2 log""([Mn^(2+)])/([MnO_4^-][H^+]^8)` `E-E^@=-0.0118 log""((1))/((1)(10^-4)^8)=-0.38` volt The couple `MnO_4^-//Mn^(2+)` has thus moved down by 0.38 volt from its standard value i.e to a position of less oxidising POWER.

Discussion

42.	How much ice will separate if a solution containing 25g of ethylene glycol [C_(2)H_(4)(OH)_(2)] in 100g of water is cooled to -10^(@)C, ? K_(f)(H_(2)O)=1.86
Answer» ANSWER :`25.05g`

Discussion

43.	How much heat will be required at constant pressurent to form 1.28 kg of CaC_(2) from CaO(s) & C(s)? {:("Given :",Delta_(f)H^(@) (CaO","s),=,-152 kcal//mol),(,Delta_(f)H^(@) (CaC_(2)","s),=,-14 kcal//mol),(,Delta_(f)H^(@) (CO","g),=,-26 kcal//mol):}
Answer» `+112` KCAL `224` kcal `3840` kcal `2240` kcal Answer :D

Discussion

44.	How much heat is produced in buring a mole of CH_(4) under standard conditions if reactants and products are brought to 298 K and H_(2)O(l) is formed ? What is the maximum amount of useful work thatcan be accomplished under standard conditions by this system ? CH_(4)(g)+2O_(2)(g) to CO_(2)(g)+2H_(2)O(l) {:(DeltaHf^(0):-74.8,0,-393.5,-285.85kJ),(DeltaGf^(0):-50.8,0,-394.4,-236.8kJ):}
Answer» Solution :`DeltaH^(@)=(-393.5)+(2xx-285.85)-(-74.8)-2xx0` `=-890.4kJ`/MOLE Now the free ENERGY CHANGE for a process `DeltaG` equals the maximum useful work that can be done by the system at constant TEMPERATURE and pressure. `:. W_(max)=DeltaG=(2xx-236.8)+(-394.4)-(50.8)-2xx0` `=-817.2kJ`/mole `CH_(4)`.

Discussion

45.	How much heat is required to change 5 gram ice (0^@C) to steam at 100^@C ? Latent heat of fusion and vaporization for water are 80 cal/g and540 cal/g respectively . Specific heat of water is 1 cal/ g/k.
Answer» 7200 cal 3600 cal 1800 cal 900 cal ANSWER :B

Discussion

46.	How much heat is required to change 10 g of ice at 0^@Cto steam at 100^@C?
Answer» SOLUTION :`Delta H("total") = Delta H_("FUSION") + Delta H_("heating") + Delta H_(vap)` ` = 10(80) + 1 XX 100 + 540 ) ` CAL

Discussion

47.	How much gram of acid should be present in 100 mL volume of solution to obtain decimolar solution having 200 gm/mole molecular mass of diabasic acid ?
Answer» 20 gm 1 gm 2 gm 10 gm SOLUTION :Decimolar means 0.1 M `M=("MOLE")/("Liter")=(w)/(200)xx(1)/(100)xx1000 =0.1` `therefore 0.1=(w)/(20) therefore 2=2` gm.

Discussion

48.	How much H_(2)SO_(4) is required to prepare 0.1 M 1 liter H_(2)SO_(4) solution ? The density of 98% W/W H_(2)SO_(4) is 1.80 gm/mL.
Answer» 22.20 mL 5.55 mL 11.10 mL 16.65 mL SOLUTION :`M=("% of solute"xx10xx"density")/("molecular WEIGHT")` `M=(98xx1.80xx10)/(98)=18M` `M_(1)V_(1)=M_(2)V_(2)` `18xx V_(1)=0.1xx1000` `V_(1)=(0.1xx1000)/(18)=5.55 mL`

Discussion

49.	How much glucose, C_(6)H_(12)O_(6) must be dissolved per litre of the solution that yields osmotic pressure os 2.72 atmospheres at 298 K ? R=0.0821 L atm K^(-1).
Answer» Solution :`"Molar mass of GLUCOSE "C_(6)H_(12)O_(6), M_(B)=6xx12+12+6xx16=180" G mol"^(-1)` `V=1.0L, pi=2.72 ATM, R=0.0821" L atm K"^(-1)mol^(-1), T=298K, W_(B)=?` `piV=n_(B)RT or n_(B)=(piV)/(RT),W_(B)/M_(B)=(piV)/(RT)` `W_(B)=(M_(B)xxpixxV)/(RT)=((180" g mol"^(-1))xx(2.72" atm")xx(1L))/((0.0821"L atm K"^(-1)mol^(-1))xx(298 K))=20.0116 g.`

Discussion

50.	How much faster would a reaction proceed at 25^@ than at 0^@C if the activation energy is 65 kJ:
Answer» 2 times 16 times 11 times 6 times Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How much water should be added to 100 ml of1MH_(2)SO_(4) solution to make it exactly 0.1 N ?

How much volume of oxygen will be required for complete combustion of 40 mL of acetylene (C_(2)H_(2)) and how much volume of carbon dioxide will be formed? All volumes are measrued at NTP.

How much urea must be dissolved in 10^(-2)m^(3) water to yield a pressure is 2.03xx10^(5)Nm^(-2) at 300K?

How much urea (molar mass = "60 g mol"^(-1)) should be dissolved in 50 g of water so that its vapour pressure at room temperature is reduced by 25%. Calculate molality of the solution obtained.

How much time would it take in minutes to deposit 1.18 g of metallic copper on a metal object when a current of 2.0 A is passed through the electrolytic cell containing Cu^(2+) ions? [Molar mass of Cu = 63.5 g mol^(-1), 1F = 96,500 Cmol^(-1)]

How much type of colloidal systems can be formed on the basis of physical state of dispersion medium and dispersion phase ?

How much time would be needed to deposit 0.25 g of metallic nickel. (Atomic mass = 58.5) on a metal object using a current of 1A during electroplating?

How much time in minutes passes between 99% to 99.9% completion of a first order reaction with half life 0.3010"min"^(-1)?

How much time (in hours ) would it take to distribute one avogardo number of wheat grains if 10^20 grains are distributed each second ?

How much time (in hours) is required for a current of 2 amp to decompose electrolytically 18g of water.

How much time is required for completion of a zero order reaction?

How much sulphur is present in organic compoundif on analysis 0.53 gmof thiscompound gives 1.158 gm of BaSO_(4).

How much sulpher is present in the rubber used for tyres ?

How much sulphur is added during vulcanization to get rubber for tyre ?

How much sulpher is present in the rubber used for bettery case ?

How much sugar (C_(12)H_(22)O_(11)) will be required if each person on the earth is given 100 molecules of sugar? The population of the earth is 3xx10^(10).

How much sodium chloride be dissolved in water to make 1 litre of 0.1 F solution ?

How much sodium acetate should be added to a 0.1 M solution of CH_(3)COOH to give a solution of pH = 5.5 (pK_(a) of CH_(3)COOH = 4.5)

How much should the pressure be increased in order to decrease the volume of a gas 5% at a constant temperature ?

How much quantity of electricity present on 1 electron in coulomb ?

How much quantity of electricity is required to liberated 1 g equivalent weight of an element ?

How much quantity of electricity has to be passed through 200 mL of 0.5 M CuSO_(4) solution to completely deposite copper ?

How much Pt is deposited on cathode when 0.80F current is pass through 1.0 M solution of Pt^(4+) ?

How much propanol is required for dehydration to get 2.24 litre of propene at N.T.P. If yield is 100%

How much PCl_(5) must be added to one litre volume reaction vessel at 250^(@)C in order to obtain a concentration of 0.1 mole of Cl_(2),K_(c) for PCl_(5)hArrPCl_(3)+Cl_(2) is 0.0414" mol dm"^(-3) at 250^(@)C.

How much PCl_(5) must be added to one litre volume reaction vessel at 250^(@)C in order to obtain a concentration of 0.1 mole of Cl_(2),K_(c) for PCl_(5)hArrPCl_(5)+Cl_(2) is 0.0414" mol dm"^(-3) at 250^(@)C.

How much oxygen is required for complete combustion of 560 g of ethene (Mw = 28 g/mol) ?

How much of sulphur is present in an organic compound, if 0.53g compound gave 1.158g of BaSO_(4) analysis?

How much of NaOH is required to neutralise 1500cm^(3) of 0.1 N HCl ? (Na = 23)

How much of NaOH is required to neutralise 1500 cm^(3)of 0.1 N HCI? (Na = 23)

How much of NaOH is required to neutralise 1500 cm^(3) of 0.1N HCl? (Na= 23)

How much of Fe can be theoretically obtained by the reaction of 1 kg of Fe_(2)O_(3)?

How much moles of oxidizing agents are reduced by complete reaction of 63.5 gm of Cu with concentrated HNO_(3) solution ? (Atomic weight of Cu=63.5 gm mol^(-1))

How much minimum volume (in ml) of ((5)/(51)) M aluminium sulphate solution should be added to excess calcium nitrate to obtain atleast 1 gm of each salt in the reaction Al_(2) (SO_(4))_(3) + 2Ca(NO_(3))_(2) rarr 2Al(NO_(3))_(3) + 3CaSO_(4)

How much NaOH is required to prepare 10% w/w 500 gram solution of NaOH ?

How much molecular mass of NaCl is obtained experimentally using colligative properties?

How much methanol should be added to water, to make 150 mL. 2 M solution of CH_(3)OH ?

How much marble of 96.5% purity would be required to prepare 10 litres of carbon dioxide at STP when the marble is acted upon by dilute hydrochloric acid?

How much marble mainly [CaCO_(3)] " of " 96 . 5%purity would be required to prepare 10 litres of CO_(2) at STP when the marble is acted upon by dilute HCl ?

How much litres of dihydrogen gas will be produced at STP in the reaction of ethanol with 12 gram of Mg ? (Mg = 24 gram//mol)

How much is the oxidising power of the MnO_4^(-) (1M)|Mn^(2+) (1M) couple decreased if the H^+ concentration is decreased from 1M to 10^-4 M at 25^@C

How much ice will separate if a solution containing 25g of ethylene glycol [C_(2)H_(4)(OH)_(2)] in 100g of water is cooled to -10^(@)C, ? K_(f)(H_(2)O)=1.86

How much heat will be required at constant pressurent to form 1.28 kg of CaC_(2) from CaO(s) & C(s)? {:("Given :",Delta_(f)H^(@) (CaO","s),=,-152 kcal//mol),(,Delta_(f)H^(@) (CaC_(2)","s),=,-14 kcal//mol),(,Delta_(f)H^(@) (CO","g),=,-26 kcal//mol):}

How much heat is required to change 5 gram ice (0^@C) to steam at 100^@C ? Latent heat of fusion and vaporization for water are 80 cal/g and540 cal/g respectively . Specific heat of water is 1 cal/ g/k.

How much heat is required to change 10 g of ice at 0^@Cto steam at 100^@C?

How much gram of acid should be present in 100 mL volume of solution to obtain decimolar solution having 200 gm/mole molecular mass of diabasic acid ?

How much H_(2)SO_(4) is required to prepare 0.1 M 1 liter H_(2)SO_(4) solution ? The density of 98% W/W H_(2)SO_(4) is 1.80 gm/mL.

How much glucose, C_(6)H_(12)O_(6) must be dissolved per litre of the solution that yields osmotic pressure os 2.72 atmospheres at 298 K ? R=0.0821 L atm K^(-1).

How much faster would a reaction proceed at 25^@ than at 0^@C if the activation energy is 65 kJ: