94420 + Interview Questions in Chemistry in Class 12

1.	Aqueous solutions of two compounds M - O - H and M' - O - H have been prepared in two different beakers. If the electronegativity of M = 3.5, M' = 1.72, O = 3.0 and H = 2.1, then the solution respectively are
Answer» acidic , acidic acidic , basic basic , basic basic , acidic SOLUTION :In the compound M - O - H, if IE or E.N. of M is low, the compound will act as a base and if the IE or E. N. of M is high, the compound will behave as an ACID. Therefore, M - O - H will act as an acid E.N. of M is high (3.5) and M. - O - H will act as a base as E.N. of M. is low (1.72).

Discussion

2.	Aqueous solution of an acetate salt, when heated with FeCl_3 solution gives a blood red solution due to the formation of :
Answer» `FE(CNS)_3` `(CH_3COO)_3Fe` `Fe(OH)_3` `FeCl_3.CH_3COOH`. Solution :`3CH_3COOM + FeCl_3to UNDERSET("RED colour")((CH_3COO)_3 Fe) + 3MCl`

Discussion

3.	Aqueous solutions of Na_(2)S_(2)O_(3) on reaction with Cl_(2) gives
Answer» `Na_(2)S_(4)O_(6)` `NaHSO_(4)` NaCl NaOH Solution :`Na_(2)S_(2)O_(3)+4Cl_(2)+5H_(2)Oto2NaHSO_(4)+8HCl` HENCE,(B) is the correct ANSWER.

Discussion

4.	Aqueous solution of aluminium sulphate would show
Answer» `H^(+)` IONS `H_(2)^(+)` ions `H_(3)O^(+)` ions `H_(4)O^(+)` ions Solution :`UNDERSET(aq.)(H_(2)O) + underset("acid")(HA) hArr H_(3)O^(+) + A^(-)`.

Discussion

5.	Aqueous solution of alpha-amino acid is slightly acidic, which is due to
Answer» ACIDIC CHARACTER of `NH_3^(+)` BASIC character of `COO^-` Acidic character of `COO^-` basic character of `NH_3^(+)` ANSWER :A

Discussion

6.	Aqueous solutions of hydrogen suphide and sulphur dioxide when mixed together , yeild _________.
Answer» SULPHUR and water sulphur TRIOXIDE and sulphur hydrogen PEROXIDE and sulphur hydrogen and SULPHUROUS acid Answer :A

Discussion

7.	Aqueous solutions of HNO_(3), KOH, CH_(3)COOH and CH_(3)COONa of identical concentrations are provided. The pair (s) of solutions which form a buffer upon mixing is (are)
Answer» `HNO_(3)` and `CH_(3)COOH` KOH and `CH_(3)COONa` `HNO_(3)` and `CH_(3)COONa` `CH_(3)COOH` and `CH_(3)COONa` SOLUTION :`HNO_(3) + CH_(3)COONa` mixture can ACT as buffer solutions if volume of `HNO_(3)` solution taken is LESSER than volume of `CH_(3)COONa` solution because of following reaction `CH_(3)COONa+HNO_(3)RARR CH_(3)COOH + NaNO_(3)` (d) `CH_(3)COOH + CH_(3)COONa`-mixture will act as buffer.

Discussion

8.	Aqueous solution of AgNO_3 is electrolysed using inert electrodes. At the end of electrolysis
Answer» pH of the SOLUTION INCREASES pH of the solution decreases pH of the solution remains unchanged pH of the solution becomes14 Solution :at cathode `: AG^(+) + e^(-) to Ag ` , at anode `: 2H_2O to O_2 + 4H^(+) + 4e^(-)` `[H^(+)]uarr [pH]^DARR pH = log""(1)/([H^(+)])`

Discussion

9.	Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield
Answer» SULPHUR and water Sulphur TRIOXIDE and water Hydrogen PEROXIDE and sulphur Hydrogen and sulphurous acid Solution :`SO_(2) +2H_(2)S to 3S +2H_(2)O`

Discussion

10.	Aqueous solution of a salt (V) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. H_(2)SO_(4) is added to a hot concentrated solution of (V), white crystals of a weak acid separates out. Hence, the compound (Y) is
Answer» `Na_(2)SO_(4)10H_(2)O` `Ca_(2)B_(2)O_(11).10H_(2)O` `Na_(2)B_(2)O_(11)` `Na_(2)Ba_(4)O_(7).10H_(2)O` Solution :`(Y) is borax `Na_(2)B_(4)O_(7).10H_(2)O` `Na_(2)B_(4)O_(7)+7H_(2)Otounderset(ubrace("Strong base WEAK acid")_("Alkaline"))(2NaOH+4H_(2)BO_(3))` `Na_(2)B_(4)O_(7)overset(Delta)toubrace(2NaBO_(2)+B_(2)O_(3))_("Glassy-bead")` `Na_(2)B_(4)O_(7)+H_(2)SO_(4)+5H_(2)OtoNa_(2)SO_(4)+4H_(2)BO_(3)` Hence,(D) is the correct answer.

Discussion

11.	Aqueous solution of which salt has the lowest pH :
Answer» NAOH `NH_4CL` `Na_2CO_3` Nacl Answer :B

Discussion

12.	Aqueous solution of a salt 'A', when mixed with NaoH solution and warmed, a black precipitate is formed. Black ppt. is filtered and dissolved in dil. H_(2)SO_(4) solution. The resulting solution gives a chocolate coloured precipitate with potassium ferrocyanide solution. the filtrate obtained after filtering off the black precipitate, upon warming with Zn and NaOH evolves a pungent smelling gas. the resulting solution also responds to the ring test. the filtrate does not evolve any gas when it is boiled with urea in the presence of H_(2)SO_(4). Q. The chocolate coloured precipitate is:
Answer» `Fe_(2)[Fe(CN)_(6)]` `Cu_(2)[Fe(CN)_(6)]` `HgSO_(4)` `[Fe(H_(2)O)_(5)(NO)]SO_(4)` SOLUTION :`CuO+H_(2)SO_(4) to CuSO_(4)+H_(2)S` `2CuSO_(4)+K_(4)[Fe(CN)_(6)] to underset("chocolate ppt.")(Cu_(2)[Fe(CN)_(6)]darr)+2K_(2)SO_(4)`

Discussion

13.	Aqueous solution of which salt will not be hydrolysed?
Answer» POTASSIUM nitrate Potassium cyanide Potassium formate Potassium acetate Answer :A

Discussion

14.	Aqueous solution of a salt 'A', when mixed with NaoH solution and warmed, a black precipitate is formed. Black ppt. is filtered and dissolved in dil. H_(2)SO_(4) solution. The resulting solution gives a chocolate coloured precipitate with potassium ferrocyanide solution. the filtrate obtained after filtering off the black precipitate, upon warming with Zn and NaOH evolves a pungent smelling gas. the resulting solution also responds to the ring test. the filtrate does not evolve any gas when it is boiled with urea in the presence of H_(2)SO_(4). Q. The filtrate obtained after filtering off the black precipitate consists of:
Answer» `NO_(2)^(-)` `NO_(3)^(-)` `CO_(3)^(2-)` `Cl^(-)` SOLUTION :`4Zn+NaNO_(3)+7NaOH to 4Na_(2)ZnO_(2)+2H_(2)O+underset("PUNGENT smell")(NH_(3)uarr)`

Discussion

15.	Aqueous solution of a salt 'A', when mixed with NaoH solution and warmed, a black precipitate is formed. Black ppt. is filtered and dissolved in dil. H_(2)SO_(4) solution. The resulting solution gives a chocolate coloured precipitate with potassium ferrocyanide solution. the filtrate obtained after filtering off the black precipitate, upon warming with Zn and NaOH evolves a pungent smelling gas. the resulting solution also responds to the ring test. the filtrate does not evolve any gas when it is boiled with urea in the presence of H_(2)SO_(4). Q. Salt 'A' consists of:
Answer» `Cu^(2+)` `HG^(2+)` SALT `Cu^(+)` `Pb^(2+)` SOLUTION :

Discussion

16.	Aqueous solution of which of the following compounds is the best conductor ofelectric current ?
Answer» Ammonia, `NH_(3)` Fructose, `C_(6)H_(12)O_(6)` Acetic acid , `C_(2)H_(4)O_(2)` HYDROCHLORIC acid , HCl Answer :D

Discussion

17.	Aqueous solution of 3% non-volatile solute exerts a pressure of 1 bar at the boiling point of the solvent. Calculate the molar mass of solute.
Answer» Solution :DATA: (i) Vapour pressure of water at its [BOILING point temperature]`=P^(@)=1.013` bar (ii) Vapour pressure of solution at normal boiling point P=1bar 3% solution=3g of solute in 100G of solution. (iii) Mass of solute=3g(iv) Mass of solvent=100-3=97g (v) RELATIVE lowering of vapoure pressure`=(P^(@)-P)/(P)=(1.013-1)/(1.013)=0.0128` (vi) Molar mass of water=18g `mol^(-1)` Formula, `M_(2)=(W_(2))/(W_(1))xx(M_(1))/([(P^(@)-P)/(P^(@))])` Substitution: `M_(2)=(3)/(97)xx(18)/(0.0128)` ANSWER `M_(2)=43.49g//mol`.

Discussion

18.	Aqueous solution having highest pH is
Answer» `0.1 M NH_4CL` `0.1 M NACL` `0.1 M (NH_4)_2 SO_4` `0.1 M CH_3COONa` ANSWER :1

Discussion

19.	Aqueous solution contains Zn(CH_(2)COO)_(2),Cd(CH_(3)COO)_(2) and Cu(CH_(3)COO)_(2) on passing H_(2)S gas, therte is a precipitate of ……. As sulphide
Answer» `ZN^(2+)` `Cd^(2+)` `Cu^(2+)` NONE of these Answer :a,B,c

Discussion

20.	Aqueous sol. Of two compound M_(1)-O-H & M_(2)-O-H are prepared in two different beakers. If EN of M_(1) =3.4, M_(2)+1.2,O=3.5& M=2.1. Then nature of sol. Will be respectively
Answer» ACIDIC, Basic Acidic, Basic Basic, Acidic Basic, Basic. Answer :A

Discussion

21.	Aqueous sodium cyanide is used as a reagent in the metal extraction. This process is called
Answer» PYROMETALLURGY ELECTROMETALLURGY Hydrometallurgy None of these Answer :C

Discussion

22.	Aqueous silver nitrate is subjected to electrolysis, using platinum electrodes. What will be the nature of the solution after some time?
Answer» Solution :At platinum cathode reduction takes place, `Ag_((aq))^(+)+E^(-) rarr Ag_((s))`At platinum anode oxidation takes place, `2H_(2)O_((l)) rarr 4e^(-) +O_(2)+4H_((aq))^(+)`.As a result of the conversion of WATER to proton, the solution becomes ACIDIC (nitric ACID ) The pH of the solution decreases.

Discussion

23.	Aqueous NaOH reacts with white Phospho rous to form Phosphine and
Answer» `NaH_(2)PO_(2)` `P_(2)O_(5)` `Na_(3)PO_(3)` `P_(2)O_(3)` Answer :1

Discussion

24.	Aqueous NaCl solution is electrolyzed using platinum electrodes. What is the product formed at cathode?
Answer» NA `H_2` `O_2` `Cl_2` ANSWER :B

Discussion

25.	Aqueous HCL is an acidic solution whereas aqueous NH_3is a basic solution. Justify this statement.
Answer» Solution :`HCl+H_2O leftrightarrow H_3O^(+)+ Cl^-` In this CASE, in ADDITION to auto ionisation of water. HCl molecule also produces `H_3O^+` ion by donating a proton to water and hence `[H_3O^+] gt [OH^-]` . It means that the AQUEOUS HCl solution is acidic. Similarly in BASIC solution such as aqueous `NH_3,[OH^-] gt [H_3O^+]` and it is basic.

Discussion

26.	Aqueous ethanolic solution of 2-3% Iodine is
Answer» ANTISEPTIC Tincture of iodine Antihistamine Antifertility drug SOLUTION :low CONC phenol act as antiseptic and in high conc act as disinfectant

Discussion

27.	Aqueous copper sulphate solution (blue in colour) gives : (i) a green precipitate with aqueous potassium fluoride and (ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.
Answer» Solution :Aqueous `CuSO_(4)` solution EXISTS as `[Cu(H_(2)O)_(4)]SO_(4)` which has blue colour. (i) When KF is added, weak `H_(2)O` ligands are replaced by F ligands forming `[CuF_(4)]^(2-)` ions which is a green precipitate. `[Cu(H_(2)O)_(4)]^(2+)+4F^(-)tounderset("Tetrafluorocuprate(II)(Green ppt.)")([CuF_(4)]^(2-))+4H_(2)O` (ii) When KCl is added, weak `H_(2)O` ligands are replaced by `CL^(-)` ligands forming `[CuCl_(4)]^(2-)` ion which has bright green colour. `[Cu(H_(2)O)_(4)]^(2+)+4Cl^(-)tounderset("Tetrachlorocuprate(II)(Bright Green solution)")([CuCl_(4)]^(2-))+4H_(2)O`

Discussion

28.	Aqueous copper sulphate solution (blue in colour) gives (i) a green precipitate with aqueous potassium fluoride, and (ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.
Answer» Solution :Aqueous `CuSO_(4)` solution exists as `[Cu(H_(2)O)_(4)]SO_(4)` which has blue COLOUR due to `[Cu(H_(2)O)_(4)]^(2+)` ions. (i) When KF is added, the weak `H_(2)O` LIGANDS are replaced by `F^(-)` ligands FORMING `[CuF_(4)]^(2-)` ions which is a green precipitate. `[Cu(H_(2)O)_(4)]^(2+)+4F^(-)rarrunderset(("Green ppt."))underset("Tetrafluorocuprate(II)")([CuF_(4)]^(2-))+4H_(2)O` (ii) When KCl is added, `Cl^(-)` ligands replace the weak `H_(2)O` ligands forming `[CuCl_(4)]^(2-)` ION which has bright green colour. `[Cu(H_(2)O)_(4)]^(2+)+4Cl^(-)rarrunderset(("Green solution"))underset("Tetrachlorocuprate(II)")([CuCl_(4)]^(2-))+4H_(2)O` Alternatively, directly we can write the REACTION as : `CuSO_(4)(aq)+4KF(aq)rarrK_(2)[CuF_(4)]+K_(2)SO_(4)` `CuSO_(4)(aq)+4KCl(aq)rarrK_(2)[CuCl_(4)]+K_(2)SO_(4)`

Discussion

29.	Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed separated electrolytic cells. Will the mass of copper and silver deposited on the cathode be same different ? Explain your answer.
Answer» Solution :* It will be different. ACCORDING to Faraday.s second law, the amounts of different substances liberated by the same quantity of electricity passing through the electrolytic solution are Proportional `("Atomic mass of meta")/("No. of electrons")` to their chemical EQUIVALENT weights electrons required to reduce the cation. Here, for the electrode reactions: `Ag^(+)+e^(-) to Ag and Cu^(2+) +2e^(-) to Cu` * Hence, one mole of `Cu^(2+) and Ag^(3+)` REQUIRE 2 mol of electron (2F) and 1 mol of electrons `(F_(1))` respectively.

Discussion

30.	Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed by 1 ampere current for 10 minutes in separate electrolytic cells. Will the mass of copper and silver deposited on the cathode be same or different ? Explain your answer.
Answer» Solution :Different. ACCORDING to Faraday.s second law, amounts of different substances liberated by the same quantity of electricity PASSING through the electrolytic solutions are proportional to their chemical equivalent weights. SINCE the equivalent weights of copper and SILVER are different, we shall obtain different masses of copper and silver.

Discussion

31.	Aqueous 10% NaHCO_3 solution is used as a reagent for identifying X'. Which one of the following compounds yields 'X' on hydrolysis?
Answer» `CH_(3) CO_(2) C_(2) H_(5)` `C_(2) H_(5) - O - C_(2) H_(5)` `CH_(3) CHO` `CH_(3) - CH_(2) - OH` Answer :A

Discussion

32.	Aquatic animals are more comfortable in cold water rather in warm water. Give reason.
Answer» SOLUTION :Because solubility of oxygen in more in COLD WATER than in WARM water.

Discussion

33.	Aquaregia is
Answer» 1:3 conc. `HNO_(3)` and conc. HCI 1:2 conc. `HNO_(3)` and conc. HCI 3:1conc. `HNO_(3)` and conc. HCI 2:1 conc. `HNO_(3)` and conc. HCI Solution :ONE PART of CONCENTRATED `HNO_3 and 3` parts concentrated HCL form AQUAREGIA.

Discussion

34.	Aqua regia is used for dissolving which metals
Answer» Alkali Alkaline earth Noble Transition Answer :C

Discussion

35.	Aqua regia reacts with Pt to yield:
Answer» `PT(NO_3)_4` `H_2PtCI_6` `PtCI_4` `PtCI_2` ANSWER :B

Discussion

36.	Aqua regia is a mixture of ________ and _______ in the ratio of 3:1.
Answer» SOLUTION :CONC. HCL. Conc. `HNO_3.`

Discussion

37.	Aqua regia is a mixture of .......... and ............ in the ratio 3:1 .
Answer» SOLUTION :CONC. HCL. Conc. `HNO_3.`

Discussion

38.	Aqua-regia is a mixture of:
Answer» `3HCL + HNO_3` `3HNO_3 + HCL` `H_3PO_4 + H_2SO_4` `HCl + CH_3COOH` ANSWER :A

Discussion

39.	Aquaregia is a mixture of
Answer» `HCl +CH_(3)COOH` `3HNO_3+HCl` `H_(3)PO_(4)+H_(2)SO_(4)` `3HCl + HNO_3` Solution :Aqua-regia : 3 moles of CON. HCI + 1 mol of con. HNO,

Discussion

40.	Aqua regia is a mixture of .......... .
Answer» SOLUTION :CONC. `HNO_(3)` (1 part) + conc. HCL(3 parts)

Discussion

41.	Aqua regia is
Answer» `conc. HC + conc. HNO_3 in 1: 3 ratio` `DIL. HCI and di.HNO_3 in 3:1 ratio` `dil. HCT and dil. HNO_3 in 3:1 ratio` `conc. HCl and conc. HNO_3 in 3 : 1 ratio` Answer :D

Discussion

42.	Aqua regia has the composition :
Answer» 1 PART CONC. `HNO_3 + 2` PARTS conc. HCI 1 part conc. `HNO_3 + 3` parts conc. HCI 1 part conc. `HNO_3` + 1 part conc. HCl 2 parts conc. `HNO_3 + 3` parts conc. HCI Solution : 1 part conc. `HNO_3 + 3` parts conc. HCI

Discussion

43.	Aqua regia a mixture of?
Answer» `3:` ratio of conc HCl and Conc. `HNO_(3)` `3:1` ratio of conc `HNO_(3)` and Conc. HCl `1:3` ratio of conc HCl and CON. `HNO_(3)` `1:3` ratio of conce HCl and conc .`H_(2)SO_(4)` SOLUTION :Conceptual

Discussion

44.	Aqua fortis is :
Answer» `HNO_3` `HNO_2` `H_2NO_2` `H_2N_2O_2` ANSWER :A

Discussion

45.	Aqueous solution of HCI conducts electricity because :
Answer» It UNDERGOES ionisation It associates Forms HYDROGEN bonds None Answer :A

Discussion

46.	Aq. Solutionof CH_3CH_2COONa on electrolysis gives propane. Is it true or false?
Answer» SOLUTION :n-butane

Discussion

47.	Aq solution contains Zn(CH_(3)COO)_(2) Cd(CH_(3)COO)_(2) and Cu(CH_(2)COO)_(2) on passing H_(2)Sgas there is precipitateof …….. As sulphide.
Answer» `ZN^(2+),CD^(2+)` `CU^(2+),Cd^(2+)` `Zn^(2+),Cu^(2+)` `Zn^(2+),Cu^(2+),Cd^(2+)` ANSWER :d

Discussion

48.	Aprotic solvent is :
Answer» `CCl_4` `C_6H_6` `SO_2` All of these Answer :D

Discussion

49.	Approximately what percentage of air by volume gets used in a process of combustion:
Answer» `20%` `10%` `35%` `55%` ANSWER :A

Discussion

50.	Approximately linearrelationship between the square roots of the frequencies of the X-raysemitted by a number of different elements and the atomic numbers was discovered by:
Answer» Newland Moseley Dobereiner Memdeleev Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Aqueous solutions of two compounds M - O - H and M' - O - H have been prepared in two different beakers. If the electronegativity of M = 3.5, M' = 1.72, O = 3.0 and H = 2.1, then the solution respectively are

Aqueous solution of an acetate salt, when heated with FeCl_3 solution gives a blood red solution due to the formation of :

Aqueous solutions of Na_(2)S_(2)O_(3) on reaction with Cl_(2) gives

Aqueous solution of aluminium sulphate would show

Aqueous solution of alpha-amino acid is slightly acidic, which is due to

Aqueous solutions of hydrogen suphide and sulphur dioxide when mixed together , yeild _________.

Aqueous solutions of HNO_(3), KOH, CH_(3)COOH and CH_(3)COONa of identical concentrations are provided. The pair (s) of solutions which form a buffer upon mixing is (are)

Aqueous solution of AgNO_3 is electrolysed using inert electrodes. At the end of electrolysis

Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield

Aqueous solution of a salt (V) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. H_(2)SO_(4) is added to a hot concentrated solution of (V), white crystals of a weak acid separates out. Hence, the compound (Y) is

Aqueous solution of which salt has the lowest pH :

Aqueous solution of which salt will not be hydrolysed?

Aqueous solution of which of the following compounds is the best conductor ofelectric current ?

Aqueous solution of 3% non-volatile solute exerts a pressure of 1 bar at the boiling point of the solvent. Calculate the molar mass of solute.

Aqueous solution having highest pH is

Aqueous solution contains Zn(CH_(2)COO)_(2),Cd(CH_(3)COO)_(2) and Cu(CH_(3)COO)_(2) on passing H_(2)S gas, therte is a precipitate of ……. As sulphide

Aqueous sol. Of two compound M_(1)-O-H & M_(2)-O-H are prepared in two different beakers. If EN of M_(1) =3.4, M_(2)+1.2,O=3.5& M=2.1. Then nature of sol. Will be respectively

Aqueous sodium cyanide is used as a reagent in the metal extraction. This process is called

Aqueous silver nitrate is subjected to electrolysis, using platinum electrodes. What will be the nature of the solution after some time?

Aqueous NaOH reacts with white Phospho rous to form Phosphine and

Aqueous NaCl solution is electrolyzed using platinum electrodes. What is the product formed at cathode?

Aqueous HCL is an acidic solution whereas aqueous NH_3is a basic solution. Justify this statement.

Aqueous ethanolic solution of 2-3% Iodine is

Aqueous copper sulphate solution (blue in colour) gives : (i) a green precipitate with aqueous potassium fluoride and (ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.

Aqueous copper sulphate solution (blue in colour) gives (i) a green precipitate with aqueous potassium fluoride, and (ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.

Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed separated electrolytic cells. Will the mass of copper and silver deposited on the cathode be same different ? Explain your answer.

Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed by 1 ampere current for 10 minutes in separate electrolytic cells. Will the mass of copper and silver deposited on the cathode be same or different ? Explain your answer.

Aqueous 10% NaHCO_3 solution is used as a reagent for identifying X'. Which one of the following compounds yields 'X' on hydrolysis?

Aquatic animals are more comfortable in cold water rather in warm water. Give reason.

Aquaregia is

Aqua regia is used for dissolving which metals

Aqua regia reacts with Pt to yield:

Aqua regia is a mixture of ________ and _______ in the ratio of 3:1.

Aqua regia is a mixture of .......... and ............ in the ratio 3:1 .

Aqua-regia is a mixture of:

Aquaregia is a mixture of

Aqua regia is a mixture of .......... .

Aqua regia is

Aqua regia has the composition :

Aqua regia a mixture of?

Aqua fortis is :

Aqueous solution of HCI conducts electricity because :

Aq. Solutionof CH_3CH_2COONa on electrolysis gives propane. Is it true or false?

Aq solution contains Zn(CH_(3)COO)_(2) Cd(CH_(3)COO)_(2) and Cu(CH_(2)COO)_(2) on passing H_(2)Sgas there is precipitateof …….. As sulphide.

Aprotic solvent is :

Approximately what percentage of air by volume gets used in a process of combustion:

Approximately linearrelationship between the square roots of the frequencies of the X-raysemitted by a number of different elements and the atomic numbers was discovered by:

Aqua regia is a mixture of __ and _ in the ratio of 3:1.