94420 + Interview Questions in Chemistry in Class 12

1.	Potassium permanganate and potassium dichromate are two transition metal compounds. Write any two uses of potassium permanganate.
Answer» SOLUTION :`KMnO_4` is USED as an OXIDISING agent in the laboratory. It is used as a DISINFECTANT for water.

Discussion

2.	Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are resectively
Answer» `MnO_(4)^(2-),MN^(3+) and Mn^(2+)` `MnO_(2), MnO_(2) and Mn^(2+)` `MnO_(2), MnO_(2)^(+) and Mn^(3+)` `MNO,MnO_2 and Mn^(2+)` ANSWER :B

Discussion

3.	Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final product obtained from it in three condition are respectively:
Answer» `MnO_(2),NnO_(2),MN^(2+)` `MnO_(4)^(2-),Mn^(3+),Mn^(2+)` `MnO_(2),MnO_(4)^(2-),Mn^(3+)` `MnO,MnO_(4),Mn^(2+)` Solution :`MnO_(2),MnO_(2), Mn^(2+)` In neutral medium, `2KMnO_(4)+3MnSO_(4)+2H_(2)OrarrK_(2)SO_(4)+2H_(2)SO_(4)+5MnO_(2)` In alkaline medium, `2KMnO_(4)+H_(2)Orarr 2MnO_(2)+2KOH+3O` In acidic medium, `2KMnO_(4)+3H_(2)SO_(4)rarrK_(2)SO_(4)+2overset(+2)MnSO_(4)+5H_(2)O+5O`

Discussion

4.	Potassium nitrate on thermal decomposition gives
Answer» `N_2` `O_(2)` `H_(2)` `O_(3)` ANSWER :B

Discussion

5.	Potassium occurs mainly in nature as :
Answer» KBr `KHCO_(3)` `KNO_(3)` `K_(2)SO_(4)` ANSWER :C

Discussion

6.	Potassium nitrate is called
Answer» MOHR's SALT Gypsum INDIAN salt petre Chile salt petre Answer :C

Discussion

7.	Potassium metal crystallizes in a face-centred arrangement of atoms where the edge of the unit cell is 0.574 ran, What is the shortest separation of any two potassium nuclei? [Hint: Calculate diameter of K]
Answer» ANSWER :0.406 NM

Discussion

8.	Potassium manganite (K_(2)MnO _(3)) is formed when
Answer» chlorine is passe dinto aqueous `KMnO_(4)` solution manganes dioxide is fused with potassium hydroxide in air `MnSO_(4)` is reacted WHTI AQ. `KMnO_(4)` `K_(2)MnO_(4)` on red heat Answer :D

Discussion

9.	Potassium meta bisulphite is used as_____.
Answer» FOOD PRESERVATIVE sweetening agent a cosmetic an ANTIOXIDANT ANSWER :A

Discussion

10.	Potassium manganate (K_(2)MnO_(4))is formed when
Answer» chlorine is passed into aqueous `KMnO_(4)`solution manganesedioxide isfused with potassium hydroxide in air formaldehyde reacts with potassium permanganate in PRESENCE of a STRONG alkali potassium permanganate reacts with concentrated sulphuric acid. Solution :`2MnO_(2)+4KOH+O_(2)RARR underset("Pot. MANGANATE")(2K_(2)MnO_(4))+2H_(2)O`

Discussion

11.	Potassium manganate (K_2MnO_4) is formed . When:
Answer» Cuprous oxide reacts with alkaline `KMnO_4` solution Manganese dioxide is fused with `K_2CO_3` in PRESENCE of `KNO_3` Formaldehyde reacts with POTASSIUM permanganate in presence of concentrated potassium hydroxide solution Potassium permanganate is heated with potassium hydroxide Solution :(A)`KMnO_4 +Cu_2O + KOH to 2CU(OH)_2 + K_2MnO_4` (B)`2MnO_2 + 2K_2CO_3 + O_2 ("from" KNO_3) to 2K_2MnO_4 + 2CO_2` (C )`HCHO + 2KMnO_4 + 2K_2MnO_4 + H_2O +HCOOH` (D)`4KMnO_4+4KOH oversetDeltato4K_2MnO_4 +2H_2O + O_2`

Discussion

12.	Potassium manganate (K_2MnO_4) is formed when:
Answer» Chlorine is passed into AQUEOUS `KMnO_4` solution Manganese DIOXIDE is fused with potassium hydroxide in air Potassium permanganate reacts with CONC. Sulphuric acid None Answer :B

Discussion

13.	Potassium manganate (K_2MnO_4) is formed when :
Answer» `Cl_2` is passed into an aqueous `KMnO_4` solution `MnO_2` is fused with KOH in air Formaldehyde REACTS with `KMnO_4` in presence of storng ALKALI `KMnO_4` reacts with concentrated `H_2SO_4` Answer :B

Discussion

14.	Potassium is kept in :
Answer» kerosene water ammonia alcohol Answer :D

Discussion

15.	Potassium hexacyanoferrate (II) is:
Answer» `K_4[FE(CN)_6]` `K_3[Fe(CN)_6]` `K_3[Fe(SCN)_4` `KFE(SCN)_4` Answer :A

Discussion

16.	Potassium hexachloroplatinate, K_(2)[PtCl_(6)] adopts anti-fluorite crystal structure. The correct informations about ideal K_(2)[PtCl_(6)] crystal is/ are:
Answer» `K^(+)` ions occupy all the tetrahedral voids. The unit cell is FCC with respect to `PtCl_(6)^(2-)` ions. The coordination NUMBER of `PtCl_(6)^(2-)` ions is 4. The coordination number of `PtCl_(6)^(2-)`ions is 8. Solution :Theory based.

Discussion

17.	Potassium having atomic mass = 39.1 u contains 93.10 mass % ""^(39)K, having atomic mass 38.96371 u, 0.0118 mass % ""^(40)K, which has mass of 40.0 u and is radioactive witht_(1//2) = 1.3 xx 10^(9) y and 6.88 mass % ""^(41)K having a mass of 40.96184 u. Calculate the specific activity of naturally occurring potassium.
Answer» ANSWER :SPECIFIC ACTIVITY `= 30.69` DIS. `G^(–1) s^(–1)`

Discussion

18.	Potassium has a bcc structure with nearest neighbor distance 4.52Å. Its atomic weight is 39. its density will be ……………… .
Answer» `"915 kg m"^(-3)` `"2142 kg m"^(-3)` `"452 kg m"^(-3)` `"390 kg m"^(-3)` Solution :`(rho)=(nM)/(a^(3)N_(A))" For bcc n = 2 M = 39."` NEAREST distance `2r=4.52` `a=(4r)/(SQRT3)=(2xx4.52xx10^(-10))/(sqrt3)=5.21xx10^(-10)` `rho=(2xx39)/((5.21xx10^(-10))^(3)XX(6.023xx10^(23)))""rho="915 kg m"^(-3)N_(A)`

Discussion

19.	Potassium hexachloroplatinate (IV) is given with the chemical formula
Answer» `PT[K(Cl)_6]` `K[Pt(Cl)_6]` `K_2[Pt(Cl)_6]` `K_4[Pt(Cl_6)]` Answer :C

Discussion

20.	Potassium ferrocyanide is used for testing
Answer» `Cu^(2+)` and `ZN^(2+)` `Fe^(3+)` and `CA^(2+)` `Ag^(+)` and `Zn^(2+)` `Th^(4+)` and `Cu^(2+)` Solution :(A)`Cu_(2)[Fe(CN)_(6)],K_(2)Zn_(3)[Fe(CN)_(6)]_(2)`, (B)`Fe_(4)[Fe(CN)_(6)]_(3),K_(2)Ca[Fe(CN)_(6)]` (C )`Ag_(4)[Fe(CN)_(6)],K_(2)Zn_(3)[Fe(CN)_(6)]`, (D)`Th[Fe(CN)_(6)],Cu_(2)[Fe(CN)_(6)]`

Discussion

21.	Potassium ferrocyanide is used in the detection of
Answer» `Cu^(2+)` ions `Fe^(3+)` ions both none Solution :Both `Cu^(2+)` and `Fe^(3+)` are detected with potassium FERROCYANIDE. `2CuSO_(4)+K_(4)[Fe(CN)_(6)] to underset("Chocolate ppt.")(Cu_(2)[Fe(CN)_(6)]+2K_(2)SO_(4)` `4FeCl_(3)+3K_(4)[Fe(CN)_(6)] to underset("(Prussian BLUE)")underset("ferriferro cyanide")(Fe_(4)[Fe(CN)_(6)])+12KCl`

Discussion

22.	Potassium dicharomate solution is used to test drunker driver? Discuss.
Answer» Solution :Aqueous solution of potassium dichromate is ORANGE. The driver is ASKED to breath into the solution. If the solution changes to green, the driver is in DRUNKEN state. This is because dichromate oxidises ethanol to acetic ACID and itself is reduced to green chromic SALT in solution.

Discussion

23.	Potassium dichromate on heating with conc. H_2SO_4 andNaCl gives yellow coloured gas known as ........... which is used for the detection of ............. ions.
Answer» SOLUTION :CHROMYL CHLORIDE ,`CL^(-)`

Discussion

24.	Potassium dichromate is used in quantitative analysis for the estimation of …….. And ……….
Answer» SOLUTION : IRON COMPOUNDS, IODIDES

Discussion

25.	Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis.(1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V WhenH_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cationsQ0.1 M Cr_(2),O_(7)^(2-) will be a better oxidizing agent in which of the following solution
Answer» `10 ml of 1 M CH_(3)COOH + 10 ml of 1 M NH_(4) OH` `100 ml of 0.1 M NAOH + 100 ml of 0.1 M HCI` `50 ml of 0.1 M HCI` `100 ml of 10^(7-)' M HCI` Solution :`E=E^(@)-(0.0591)/(N)log(Cr^(3+))/9Cr_(2)O_(7)^(2-))^(1//2)(H^(+))^(7)`

Discussion

26.	Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis.(1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V WhenH_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cationsQWhich of the following cations can be identified by using Na_(2) CrO_(4) solution? Ba^(2+)Pb^(2+) Ag^(+)(IV) Sr^(2+)
Answer» (I), (II) (I) (I)(III) (I), (III) (I), (II), (III), (IV) SOLUTION :`BaCrO_(4)-yellow precitate` PbCrO_(4)-yellow precitate` Ag_(2)CrO_(4)-red precitate

Discussion

27.	Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis.(1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V WhenH_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cationsQThe shape of compound (Z) is
Answer» butterfly shape PENTAGONAL pyramidal pentagonal bipyramidal tetrahedral Solution :`X is CrO_(5)Z=(NH_(3))_(3)CrO_(4)`

Discussion

28.	Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis.(1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V WhenH_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cationsQThe number of moles of Cr_(2))O_(7)^(2-)required in acidic medium to oxidize 1 mol of ferric oxalate is
Answer» `10 MOL` `0.5 mol` `1.0 mol` `0.1 mol` ANSWER :C

Discussion

29.	Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis.(1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V WhenH_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cationsQWhat is the oxidation state of Cr in red-brown compound Y
Answer» `+6` `+4` `+5` `+13` Answer :C

Discussion

30.	Potassium dichromate is an orange colour crystal and is an important compound used as an oxidant in many reactions How will you account for the colour of potassium dichromate crystals?
Answer» Solution :Orange colour of dichromate ion and potassium dichromate is DUE to charge transfer (i.e., momentary transfer of charge from oxygen to metal). It is not,due to d-d transition because `CR^(+6)` does not CONTAIN any ELECTRON in tZ-orbital.

Discussion

31.	Potassium dichromate is a powerful ………. agent in acidic medium.
Answer» SOLUTION :OXIDISING

Discussion

32.	Potassium dichromate is a good oxidizing agent, in acidic medium the oxidation state of chromium changes by
Answer» 2 3 4 5 Solution :It acts as oxidising agent in acidic MEDIUM by gain of six ELECTRONS and oxidation state of CR `Cr_(2)O_(7)^(2-) + 14H^(+) +6E^(-) to 2Cr^(3+) + 7H_(2)O`

Discussion

33.	Potassium dichromate belongs to which crystal system
Answer» ANSWER :TRICLINIC

Discussion

34.	Potassium dichromate.
Answer» Solution :The uses of potassium dichromate, `K_(2)Cr_(2)O_(7)` are as follows : (1) As a strong oxidising agent. (2) In the preparation of CHROMIUM compounds LIKE lead chromate `PbCrO_(4)`, chromate alum, etc. (3) In tanning leather. (4) In dyeing (5) In the manufacture of inks and pigments. (6) In the volumetric analysis to determine FERROUS ammonium sulphate (Mohr's salt) and iodine. (7) In the DETECTION of `C^(-)` ions by chromly choride test in the qualitative analysis.

Discussion

35.	Potassium cyanide is a deadly poison. Acidified solution of KCN is carefully heated after adding MnO_(2). The product(s) obtained is (are):
Answer» cyanogens, `(CN)_(2)` `Mn(CN)_(2)` `Mn(CN)_(6)^(2-)` `K_(2)MnO_(4)` Answer :A::B

Discussion

36.	Potassium crystallizes with b.c.c. lattice and has a density of 0.856 xx 10^3 kg m^(-3). What is the length of the side of the unit cell, a, and what is the distance between (2 0 0), (1 1 0), and (2 2 2) planes? What is the closest distance between atoms, and what is the potassium atom radius, r?
Answer» ANSWER :533.3 PM; 266.7, 377.1 and 154.0 pm; 462.0, 231.0 pm

Discussion

37.	Potassium cyanide is used for separating
Answer» `Co^(2+)` and `Ni^(2+)` `Cu^(2+)` and `Cd^(2+)` `MN^(2+)` and `ZN^(2+)` `Ba^(2+)` and `CA^(2+)` Answer :a,B

Discussion

38.	Potassium crystallizes in a body-centred cubic unit cell. What is the unit-cell content (Z) for potassium?
Answer» Solution :One-eighth of each corner atom and the ENTIRE body-centred atom are contained within the UNIT cell of K. Thus, `Z =8(1/8) + f(1) =2`

Discussion

39.	Potassium crystallizes in "body centred cubic" arrangement and the surfaces of adjacent atom along the edges of unit cells are 71.4 picometre apart. Determine the density of metal. Atomic weight of K = 39.
Answer» Solution :In BCC, the relationship between edge LENGTH and radius of atom is `4r=SQRT(3)a` Also,gicen `a-2r=71.4xx10^(-10) cm` `IMPLIES`"" a-(sqrt(3))/(2)a=a[(2-sqrt(3))/(2)]` `=71.4xx10^(-10)cm` `implies ""a=5.329xx10^(-10) cm` `impliesDensity (rho)=(2xx39)/(6.023xx10^(23)(5.329xx10^(-8))^(3))` `=0.855 g/cm^(3)`

Discussion

40.	Potassium crystallizes in a body centred cubic lattice. Calculate the number of unit cells in 1 g potassium. Atomic mass of potassium=39 u.
Answer» SOLUTION :Gram atomic mass of potassium = 39 G `:.` 39G of potassium contains atoms = `6.023 xx 10^(23)` 1g of potassium contains atoms = `(6.023 xx 10^(23))/(39) = 1.54 xx 10^(22)` NUMBER of atoms in a body-centred unit cell = 2 `:.` Number of unit cells in 1 g of potassium = `(1.54 xx 10^(22))/(2) = 7.7 xx 10^(21)`

Discussion

41.	Potassium crystallizes in a body-centered cubic lattice with edge length, a = 5.2 Å (a) What is the distance between nearest neighbours? (b) What is the distance between next-nearest neighbours? (c) How many nearest neighbours does each K atom have ? (d) How many next-nearest neighbours does each K atom have ? (e) What is the calculated density of crystalline potassium ?
Answer» ANSWER :4.5 Å ,5.2Å,c8,D6 e0.92 G/`CM^(3)`

Discussion

42.	Potassium combines with two isotopes of chlorine (.^(35)Cl "and" .^(37)Cl) respectivel to form two samples of KCl. Their formation follows the law of:
Answer» CONSTANT PROPORTIONS MULTIPLE proportions RECIPROCAL proportions NONE of these. Answer :D

Discussion

43.	Potassium crystallises in a body centred cubic unit cell. The mass of one unit cell is
Answer» `1.29 xx10^(-23)` GM `1.29 xx10^(-22)` gm `6.29 xx10^(-23)` gm `1.29 xx10^(-24)` gm ANSWER :B

Discussion

44.	Potassium chromate is isomorphous to potassium sulphate (K_(2)SO_(4)). It is found to contain 2678 % chromium. Calculate the atomic mass of chromium (K = 3910).
Answer» `58` `52` `48` `49` Solution :Since the forumula of potassium sulphate is `K_(2)SO_(4)` so the FORMULA of potassium chromate is `K_(2)CrO_(4)`(`:'` it is isomorphous to `K_(2)SO_(4)`). Let atomic MASS of chromium be A, then formula mass of potassium chromate should be `= 2xx39.1+A+64 = 142.2 +A` Percentage of`Cr = (A)/(142.2+A)xx100` `26.78 = (A)/(142.2+A)xx100` On solving, A = 52.00

Discussion

45.	Potassium chromate solutionis added to an aqueoiussolution of a metal chloride.Theprecipitatethusobatainareinsoluble in acetic acid .These are subjectedto flame test , the colour of the flame is
Answer» Lilac Apple GREEN CRIMSON RED Goldenyellow Answer :B

Discussion

46.	Potassium chromate is isomorphous to potassium sulphate (K_(2)SO_(4)) and is found to contain 26.78% chromium. Calculate the atomic mass of chromium (K=39.10)
Answer» Solution :Since, the formula of potassium SULPHATE is `K_(2)SO_(4)`, so the formula of potassium chromate should be `K_(2)CrO_(4)` as it is isomorphous to `K_(2)SO_(4)`. If the atomic mass of chromium is A, then formula mass of potassium chromate should be `=2xx39.1+A+64=(142.2+A)` % of chromium `=(A)/((142.2+A))xx100` So, `(100A)/((142.2+A))=26.78` `100A=26.78(142.2+A)` or `A=(26.78xx142.2)/(73.22)=52.00`

Discussion

47.	Potassium chlorate on heating with conc H_2SO_4 gives:
Answer» CHLORINE DIOXIDE `HClO_4` `KHSO_4` All Answer :D

Discussion

48.	Potassium carbonate cannot be prepared by Solvay process, Why?
Answer» SOLUTION :Potassium carbonate cannot be prepared by Solvay process because potassium BICARBONATE being more soluble than SODIUM bicarbonate does not get precipitated when CO, is passed through a concentrated solution of KCl saturated with ammonia. KCI+ `CO_(2) + NH_(3) + H_(2)O rarrKHCO_(3) + NH_(4)CI`

Discussion

49.	Potassium bromide solution.
Answer» Solution :`2KBr_((aq))+Cl_(2_((G))) to 2KCl_((aq))+Br_(2_((L)))`

Discussion

50.	Potassium acid oxalate K_(2)C_(2)O_(4).3H_(2)C_(2)O_(4).4H_(2)O can be oxidized by MnO_(4)^(-) in acid medium. Calculate the volume of (in mL) 1 M KMnO_(4) reacting in acid solution with 5.08 gram of the acid oxalate.
Answer» ANSWER :16

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Potassium permanganate and potassium dichromate are two transition metal compounds. Write any two uses of potassium permanganate.

Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are resectively

Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final product obtained from it in three condition are respectively:

Potassium nitrate on thermal decomposition gives

Potassium occurs mainly in nature as :

Potassium nitrate is called

Potassium metal crystallizes in a face-centred arrangement of atoms where the edge of the unit cell is 0.574 ran, What is the shortest separation of any two potassium nuclei? [Hint: Calculate diameter of K]

Potassium manganite (K_(2)MnO _(3)) is formed when

Potassium meta bisulphite is used as_____.

Potassium manganate (K_(2)MnO_(4))is formed when

Potassium manganate (K_2MnO_4) is formed . When:

Potassium manganate (K_2MnO_4) is formed when:

Potassium manganate (K_2MnO_4) is formed when :

Potassium is kept in :

Potassium hexacyanoferrate (II) is:

Potassium hexachloroplatinate, K_(2)[PtCl_(6)] adopts anti-fluorite crystal structure. The correct informations about ideal K_(2)[PtCl_(6)] crystal is/ are:

Potassium has a bcc structure with nearest neighbor distance 4.52Å. Its atomic weight is 39. its density will be ……………… .

Potassium hexachloroplatinate (IV) is given with the chemical formula

Potassium ferrocyanide is used for testing

Potassium ferrocyanide is used in the detection of

Potassium dicharomate solution is used to test drunker driver? Discuss.

Potassium dichromate on heating with conc. H_2SO_4 andNaCl gives yellow coloured gas known as ........... which is used for the detection of ............. ions.

Potassium dichromate is used in quantitative analysis for the estimation of …….. And ……….

Potassium dichromate is an orange colour crystal and is an important compound used as an oxidant in many reactions How will you account for the colour of potassium dichromate crystals?

Potassium dichromate is a powerful ………. agent in acidic medium.

Potassium dichromate is a good oxidizing agent, in acidic medium the oxidation state of chromium changes by

Potassium dichromate belongs to which crystal system

Potassium dichromate.

Potassium cyanide is a deadly poison. Acidified solution of KCN is carefully heated after adding MnO_(2). The product(s) obtained is (are):

Potassium crystallizes with b.c.c. lattice and has a density of 0.856 xx 10^3 kg m^(-3). What is the length of the side of the unit cell, a, and what is the distance between (2 0 0), (1 1 0), and (2 2 2) planes? What is the closest distance between atoms, and what is the potassium atom radius, r?

Potassium cyanide is used for separating

Potassium crystallizes in a body-centred cubic unit cell. What is the unit-cell content (Z) for potassium?

Potassium crystallizes in "body centred cubic" arrangement and the surfaces of adjacent atom along the edges of unit cells are 71.4 picometre apart. Determine the density of metal. Atomic weight of K = 39.

Potassium crystallizes in a body centred cubic lattice. Calculate the number of unit cells in 1 g potassium. Atomic mass of potassium=39 u.

Potassium combines with two isotopes of chlorine (.^(35)Cl "and" .^(37)Cl) respectivel to form two samples of KCl. Their formation follows the law of:

Potassium crystallises in a body centred cubic unit cell. The mass of one unit cell is

Potassium chromate is isomorphous to potassium sulphate (K_(2)SO_(4)). It is found to contain 26*78 % chromium. Calculate the atomic mass of chromium (K = 39*10).

Potassium chromate solutionis added to an aqueoiussolution of a metal chloride.Theprecipitatethusobatainareinsoluble in acetic acid .These are subjectedto flame test , the colour of the flame is

Potassium chromate is isomorphous to potassium sulphate (K_(2)SO_(4)) and is found to contain 26.78% chromium. Calculate the atomic mass of chromium (K=39.10)

Potassium chlorate on heating with conc H_2SO_4 gives:

Potassium carbonate cannot be prepared by Solvay process, Why?

Potassium bromide solution.

Potassium acid oxalate K_(2)C_(2)O_(4).3H_(2)C_(2)O_(4).4H_(2)O can be oxidized by MnO_(4)^(-) in acid medium. Calculate the volume of (in mL) 1 M KMnO_(4) reacting in acid solution with 5.08 gram of the acid oxalate.

Potassium chromate is isomorphous to potassium sulphate (K_(2)SO_(4)). It is found to contain 2678 % chromium. Calculate the atomic mass of chromium (K = 3910).