94420 + Interview Questions in Chemistry in Class 12

1.	Excessive accumulation of organic matter in water bodies leads to
Answer» Decrease in species diversity Increase in species diversity Green house effect No effect on species diversity Solution :Organic matter (organic wastes) contains a NUMBER of pathogen, SECONDARY pollutant, pesticides etc. Biological oxygen DEMAND becomes high, and therefore the dissolved oxygen reduced. Hence, planktons Mollusca and fishes will be eliminated due to reduced dissolved oxygen and presence of secondary pollutants. Some species like annelid worm Tubifex and some insect larvae (Chironomus) tolerate POLLUTION

Discussion

2.	Excess of silver nitrate solution is added to 100 ml of 0.01 M pentaaqua chloro chromium (III) chloride solution .The mass of silver chloride obtained in grams is [Atomic mass of silver is 108]
Answer» `287xx10^(-3)` `143.5xx10^(-3)` `143.5xx10^(2)` `287xx10^(-2)` Solution :`[Cr(H_(2)O_(5))_(5)Cl]Cl_(2)underset(AgNO_(3))overset(Excess)to` `[Cr(H_(2)O)_(5)Cl]^(+)NO_(3)^(-)+2AgCldarr` Thus Meq. Of `Cl^(-)` ions outside=Meq. Of AGCL FORMED `THEREFORE` NUMBER of moles of `Cl^(-)` ions present `=(2xx100xx0.01)/(1000)=0.002 `moles `therefore` Mass of AgCl=`0.002xx143.5` =0.287 g=`287xx10^(-3)g`

Discussion

3.	Excess of NH_3 combine with sodium hypochlorite solution gives -
Answer» `NH_(4)` `NH_(2)NH_(2)` `NaNH_(2)` `NH_(3)NCl_(3)` Answer :B

Discussion

4.	Excess of PCl_(5) reacts with conc , H_(2)SO_(4) giving
Answer» sulphuryl CHLORIDE sulphurous ACID chlorosulphonic acid thionyl chloride Solution :Excessof `PCl_(5)` REACTS with conc. `H_(2)SO_(4)`to give sulphurly chloride. `underset("Sulphurice acid")(SO_(2)(OH)_(2)+2PCl_(5))tounderset("Sulphuryl chloride")(SO_(2)Cl_(2)+2POCl_(3)+2HCl`

Discussion

5.	Excess of Na^(+) ions in human system causes
Answer» diabetes anaemia HIGH PRESSURE low BLOOD pressure Solution :High Blood Pressure

Discussion

6.	Excess of isopropyl alcohol is heated with conc. H_2SO_4 at 413 K, gives
Answer» `(CH_3)_2CHOCH(CH_3)_2` `CH_3CH=CH_2` both 'a' and 'B' none of these Answer :B

Discussion

7.	Excess of KI reacts with CuSO_(4) solution and then Na_(2) S_(2) O_(3) solution is added to it . Which of the statements is incorrect for this reaction ?
Answer» `Na_(2) S_(2) O_(3)` is oxidised `CuI_(2)` is FORMED `Cu_(2) I_(2)` is formed Evolved `I_(2)` is reduced . ANSWER :B

Discussion

8.	Excess of glycol when dehydrated gives :
Answer» ETHYLENE oxide Ethanol Acrolein 1,4-dioxan Answer :D

Discussion

9.	Excess of ethanol is heated with conc. H_2SO_4 at 413 K. the compound that distills is
Answer» DIETHYL sulphate diethyl ether ethylene HYDROGEN sulphate ethylene Answer :B

Discussion

10.	Excess of copper and iron are removed mainly by which of the following chelating ligands via formation of coordination compounds?
Answer» DESFERRIOXIME-B and EDTA RESPECTIVELY EDTA and D-penicillamine respectively Desferrioxime-B and D-penicillamine respectively D-penicillamine and Desferrioxime B-respectively Answer :D

Discussion

11.	Excess of copper in toxic proportions in plants/animals can be
Answer» EDTA Ethane-1,2- diamine Oxalate ion D-penicillamine SOLUTION :D-penicillamine is used in treating wilson's disease, a RARE GENETIC disorder of copper metabolism, penicillaminetreatment relies on its binding to ACCUMULATED copper and ELIMINATION through urine.

Discussion

12.	Excess of copper and iron are removed by chelating ligands like ______
Answer» ANSWER :D-penicillamine

Discussion

13.	Excess of conc. H_(2)SO_(4) reacts with C_(2)H_(2)OH at 413 K to form.
Answer» `C_(2)H_(5)HSO_(4)` `(C_(2)H_(5))_(2)SO_(4)` `CH_(2)=CH_(2)` `C_(2)H_(6)OC_(2)H_(5)` Solution :Alcohol is dehydrated to give alkene. It is a `BETA-"elimination"` `CH_(3)-CH_(2)-OH underset(-H_(2)O)overset(H_(2)SO_(4).443K)to CH_(2)=CH_(2)` Note: At 413K, ethyl ether is obtained `C_(2_)H_(5)OH +HCO_(2)H_(5) underset(-H_(2)O) overset(H_(2)SO_(4).443K)to C_(2)H_(5)OC_(2)H_(5)`

Discussion

14.	Excess of concentrated sodium hydroxide can separate mixture of
Answer» `Al^(3+)` and `Cr^(3+)` `Cr^(3+)` and `Fe^(3+)` `Al^(3+)` and `Zn^(3+)` `Zn^(2+)` and `Pb^(2+)` Solution :`AI^(2+),Zn^(2+) and Cr^(2+)` form a soluble COMPLEX with excess of `NAOH` WHEREAS `Fe^(2+)` does not

Discussion

15.	CH_3MgI is made to react with acetone and the addition product formed is hydrolysed will give :
Answer» SEC- butanol n- butanol iso- butanol t- butanol Answer :D

Discussion

16.	When CH_3MgI is made to react with acetone and the addition product formed is hydrolysed we get :
Answer» ETHYL HYDROGEN sulphate Ethylene Diethyl sulphate Diethy ether Answer :D

Discussion

17.	Excess of carbon dioxide is passed through 50 ml of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is (At. mass of calcium=40)
Answer» `200cm^(3)` `500cm^(3)` `400cm^(3)` `300cm^(3)` Solution :According to the question, the REACTION occurs as `underset(74(=1mol))(Ca(OH)_(2))+underset(44(=1mol))(CO_(2))to underset(100(=1mol))(CaCO_(3))+underset(18(=1mol))(H_(2)O)` Given, 50 ml of 0.5 M `Ca(OH)_(2)` reacts with excess of `CO_(2)` `THEREFORE` No. of millimoles of `Ca(OH)_(2)` reacts with excess of `CO_(2)` `therefore` No. of millimoles of `Ca(HO)_(2)` reacted=25 `therefore` 1 MOLE of `Ca(OH)_(2)` gives 1 mole of `CaCO_(3)`, `therefore`No. of millieq. `=("WEIGHT in mg")/("eq. Wt")=(25xx100)/(50)=50` `implies`No. of milliequivalents of `CaCO_(3)=50` As, volume of `CaCO_(3)` solution=50 ml So, normality of `CaCO_(3)` solution=1N(millieq.=`NxxV` in ml) Normality of HCl=0.1N (given) Volume of HCl=? `N_(HCl)xxV_(HCl)=N_(CaCO_(3))xxV_(CaCO_(3))` `implies0.1xxV_(HCl)=1xx50impliesV_(HCl)=(50)/(0.1)=500cm^(3)`.

Discussion

18.	Excess of CH_(3)CO OH is reacted with CH-=CH in presence of Hg^(2+), the product is
Answer» `CH_(3)CH(OCOCH_(3))_(2)` `CH_(2)=CH(OCOCH_(3))` `(CH_(3)CO O)CH_(2)-CH_(2)(O OC CH_(3))` None of these Solution :`CH-=CH underset(Hg^(2+))OVERSET(CH_(3)CO OH)to CH_(2)=CHOCOCH_(3) overset(CH_(3)CO OH)to CH_(3)CH(OCOCH_(3))_(2)`

Discussion

19.	Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is (At. mass of carbon = 40)
Answer» 200 mL 500 mL 400 mL 300 mL Solution :`Ca(OH)_(2)+CO_(2)RARR CaCO_(3)+H_(2)O` 50 mL of 0.5 `Ca(OH)_(2)` contain `Ca(OH)_(2)` `=(0.5)/(1000)xx"50 mol"=0.025"mol"` 1 mol of `Ca(OH)_(2)` PRODUCES `CaCO_(3)` = 1 mol `therefore 0.25` mole of `Ca(OH)_(2)` will produce `CaO_(3)` = 0.025 mol `CaCO_(3)+2HClrarr CaCl_(2)+H_(2)O+CO_(2)` 1 mole of `CaCO_(3)` is NEUTRALISED by HCL = 2 mol `therefore 0.025` mol of `CaCO_(3)` will be neutralised by HCl `=2xx0.025" mol" = 0.05 " mol"` `" 1000 mL of 0.1 N HCl contain HCl = 0.1 g eq"` `"= 0.1 mol"` `"or 0.1 of HCl is present in HCl sol = 1000 mL"` `therefore" 0.05 mol of HCl will be present in HCl sol."` `=(1000)/(0.1)xx0.05mL="500 mL"`

Discussion

20.	Excess of calcium orthophosphate is reacted with magnesium to from calcium phosphide (Ca_(3)P_(2)) along with magnesium oxide. Calcium phosphide on reacting with excess of water liberate phosphine gas (PH_(3)) along with calcium hydroxide. Phosphine is burnt in excess of oxygen to from P_(2)O_(5) along with water. oxides of magnesium & phosphorous react to give magnesium metaphosphate. calculate grams of magnesium metaphosphate obtained if 1.92 gm of magnesium is taken .
Answer» SOLUTION :`Ca_(3)(PO_(4))_(2)+underset(0.08)(8 Mg) to underset("0.01 MOLE")(Ca_(3)P_(2))+underset(0.08)(8 MgO)` `underset(0.01)(Ca_(3)P_(2))+6H_(2)Oto underset(0.02) (2PH_(3))+3Ca(OH)_(2)` `underset(0.02)(2PH_(3))+4O_(2) to underset(0.01)(P_(2)O_(5))+3H_(2)O)` `underset(MgO)(0.08) +underset(0.01)(P_(2)O_(5))to underset("0.01 Mole" ~~ 1.82 GM ~~ 2gm)(MgP_(2)O_(6))`

Discussion

21.	Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is
Answer» `200 cm^(3)` `500 cm^(3)` `400 cm^(3)` `300 cm^(3)` Solution :According to the question the reaction occurs as `underset((=1"mol"))underset(74)(Ca(OH)_(2))+underset((=1"mol"))underset(44)(CO_(2))tounderset((=1"mol"))underset(100)(CaCO_(3))+underset((=1"mol"))underset(18)underset(H_(2)O` GIVEN 50 ml of 0.5 M `Ca(OH)_(2)` reacts with excess of `CO_(2)` `:.` no. of millimoles of `Ca(OH)_(2)` reacted =25 `:'` 1 mile of `Ca(OH)_(2)` gives 1 mile of `CaCO_(3)`, `:.` no. of millimoles of `CaCO_(3)` formed =25 `:.` no. of millieq `=("weight in mg")/("eq. wt")=(25xx100)/50=50` `implies` no. of MILLIEQUIVALENTS of `CaCO_(3)=50` As volume of `CaCO_(3)` solution =50 ml So, normality of `CaCO_(3)` solution =1N (millieq `=NxxV` in ml) Normality of HCl `=0.1N` (given) Volume of HCl=? `N_(HCl)xxV_(HCl)=N_(CaCO_(3))xxV_(CaCO_(3))` `implies0.1xxV_(HCl)=1xx50` `impliesV_(HCl)=50/0.1=00 cm^(3)`

Discussion

22.	Excess of ammonia with sodium hypochloride solution in the presence of glue or gelatine gives.
Answer» `NaNH_(2)` `NH_(2)NH_(2)` `N_(2)` `NH_(4)Cl` Solution :`NH_(3) + NAOCL to NH_(2)- NH_(2) + NaCl + H_(2)O`

Discussion

23.	Excess of bromo ethane reactswithalcholicammonia to give,
Answer» ETHYL AMINE DIETHYL amine TRIETHYL amine all of these ANSWER :D

Discussion

24.	Excess of ammonia with sodium hypochlorite solution in the presense of gule or gelatin gives
Answer» `NaBH_(2)` `NH_(2)NH_(2)` `N_(2)` `NH_(4)Cl` Solution :Excess of ammonia `(NH_(3))` when reacts with sodium HYPOCHLORITE solution (NaOCl) in PRESENCE of glue or GELATIN gives hydrazine `(NH_(2)*NH_(2))`. This process is known as Reschig process `2NH_(3)+NaOC l toN_(2)H_(4)+NaCl+H_(2)O` Addition of gelatin or glue suppress the side reaction by complexing with the metal ions and yield of hydrazine is increased.

Discussion

25.	Excess of AgNO_(3) solution was added to 2.2 g of commercial sample of common salt dissolved in water. The mass of dried precipitate of silver chloride was 2.11 g . Calculate the percent purity of common salt.
Answer» ANSWER :39.1

Discussion

26.	Excess of AgCl is added to 0.1 M solution of KBr at 298 K. Calculate the equilibrium concentrations of Br^(-) and Cl^(-) ions. E_(Cl^(-)//AgCl//Ag)^(@)=0.222" volt"E_(Br^(-)//AgBr//Ag)^(@)=0.095 volt
Answer» Solution :`{:(,AgCl,+,Br^(-),hArr,AGBR,+,Cl^(-)),("At equilibrium,",,,(0.1-X),,,,x):}` APPLY `log K =E_(cell)^(@)/0.0591` or `"log"x/((0.1-x))=E_(cell)^(@)/0.0591`

Discussion

27.	Excess nitratein drinkin watercan cause
Answer» methemoglobinemia liver DAMAGE kindey damage Solution :Excess NITRATE in drinking watercan causemethemoglobinemia(bluebabysyndrome)

Discussion

28.	Excess chlorine,when bubbled through aqueous ferrous bromide will yeild
Answer» `FeCl_(2)` `FeBr_(2)` `FeCl_(3)` `Br_(2)` Answer :C::D

Discussion

29.	Excess H^+ and Cl^+ ions from a colloidal solution of Fe(OH)_3 can be removed by
Answer» filtration DIALYSIS sublimation chromatography SOLUTION :Ionic IMPURITIES can be REMOVED from a colloidal solution by dialysis.

Discussion

30.	Excess chlorine is passed through boiling toluene, how many chloro deriatives would you get?
Answer» SOLUTION :THREE, i.e., benzyl CHLORIDE, BENZAL dichloride and benzotrichloride.

Discussion

31.	Except which alcohol, other alcohols are weaker acid than water?
Answer» ETHANOL PHENOL METHANOL PROPANOL SOLUTION :Methanol

Discussion

32.	Except ……………… other alkanes gives a mixture of nitro aklkanes due to C-C cleavage by nitration of alkanes.
Answer» ANSWER :METHANE

Discussion

33.	Except……….all other amino acids are optically active.
Answer» SOLUTION :GLYCINE

Discussion

34.	Except helium, all the noble gases crystallize with cubic close packed structures. Derive an equation relating atomic radius to the density of cubic close packed solid of given mass and apply it to deduce the relative size of Ar and Xe if their densities are 1.4 g/cm and 2.83 g/cm^(3) respectively.
Answer» Solution : For a CCP solid : `(rho)=(nM)/(n_(A)a^(3))` Where, `rho`=Density,n=No. of atoms/unit cell M = Molar MASS, `N_(A)` = Avogadro constant, and a=Edge LENGTH `implies rho=(4M)/(N_(A)(2sqrt(2R))^(3))=(M)/(4sqrt(2)N_(A)R^(3))` `implies(rho_(x_(e)))/(rho_(Ar))=(2.83)/(1.40)((r_(Ar))/(r_(Xe)))^(3)` `implies(r_(Xe))/(R_(Ar))=((131xx1.4)/(40xx2.83))^(1//3)=1.174`

Discussion

35.	Except glycine all other naturally occurring amino acids are optically active.
Answer» ANSWER :1

Discussion

36.	Except for vitamin B_(12) all other vitamins of group B should be regularly supplied in diet. Why?
Answer» Solution :All the vitamins of group B except `B_(12)` are water SOLUBLE. So they are READILY excreted in urine. Hence they NEED to be RESTORED in the body. `B_(12)` is water insoluble and is not much excreted through urine.

Discussion

37.	Except for vitamin B_12, all other vitamins of group B, shlould be supplied regularly in diet. Why ?
Answer» Solution :Vitamin- `B2` does not occur in plants but is exclusively synthesized by the microorganisms PRESENT in the body. THEREFORE, it may not be supplied REGULARLY in die , while all other vitamins of group B should be supplied regularly in DIET.

Discussion

38.	Which statement correctly the statement ? Except for glycine, which is achiral, all the amino acids present in proteins....
Answer» Are CHIRAL , but recemic Have the L CONFIGURATION at their `alpha` CARBON Have the R configuration at their `alpha` carbon Have the S configuration at their `alpha` carbon Answer :B

Discussion

39.	Except ............ elements, all transition metals are hard and have very high melting point
Answer» SOLUTION :group-11

Discussion

40.	Except ………………. all other alcohols are weaker acid than water.
Answer» SOLUTION :METHANOL

Discussion

41.	Except_________ all elementfrom Rfto Cnare syntheticallyprearedand have verylowhalflifeperiods .
Answer» CADMIUM ACTINIUM ytrium cadmium ANSWER :B

Discussion

42.	Examples of thermoplastic polymer is/are :
Answer» UREA FORMALDEHYDE resin polythene polystyrene bakelite Solution :N//A

Discussion

43.	Examples for natural polymers are
Answer» Cotton, Silk, Bakelite and WOOL CELLULOSE, Polystyrene and Neoprene Nylon, TERYLENE and PVC Silk, Cotton and Proteins Natural Rubber Answer :D

Discussion

44.	Example the function of H_(2)-O_(2) fuel cell.
Answer» Solution :In this case, hydrogen act as a fuel and oxygen as an oxidend and the electrolyte is aqueous KOH maintained at `200^(@)`C and 20 - 40 atm. Porous graphite electrode containinng NI and NiO serves as the inert electrodes. Hydrogen and oxygen gases are bubbled through the anode and cathade, respectively. Oxidation occurs at the anode: `2H_2(G) + 4OH_((AQ))^(-) to 4H_2O_((l)) + 4e^(-)` Reduction occurs at the cathode `O_2(g) + 2H2O(l) + 4e^(-) to 4OH^(-)(aq)` The overall reaction is `2H_(2(g)) + O_(2)(g) to 2H_2O(l)` The above reactio is the same as the hydrogen combustion reaction, however, they do not react directly ie. the oxidation and reduction reactions take place separately at the anode and cathode respectively like `H_2 - O_2` fuel CELL. Other fuel cell like propane `-O_2` and methane `O_2` have also been developed .

Discussion

45.	Examples of regional pollution are
Answer» Smog Acid rain Both (a) and (B) NONE of these Answer :C

Discussion

46.	Example of unit cell with crystallographic dimensions a!=b!=c, alpha=beta=gamma=90^(@) is :
Answer» Calcite GRAPHITE RHOMBIC SULPHUR MONOCLINIC sulphur ANSWER :B

Discussion

47.	Example showing ionisation isomerism
Answer» `[Co(NO_3)(NH_3)_5]SO_4` & `[Co(SO_4)(NH_3)_5]NO_3` `[Co(NH_3)_4Cl_2]CL` & `[Co(NH_3)_5Cl]Cl_2` `[Cr(H_2O)_5Cl]Cl_2. H_2O` & `[Cr(H_2O)_4Cl_2]Cl. 2H_2O` `[PT(NH_3)_4][Pt Cl_4]` & `[Pt(NH_3)_3 Cl]_2 [Pt Cl_4]` Answer :A

Discussion

48.	Example of Ring silicate is ………….
Answer» Olivine Beryl Spodumene Asbestos Answer :B

Discussion

49.	Example of neutral complex compound in the following list
Answer» `CoCl_3. 6NH_3` `CoCl_3. 5NH_3` `CoCl_3 . 4NH_3` `CoCl_3 . 3NH_3` ANSWER :D

Discussion

50.	Exampleof intrinsic colloid is
Answer» glue sulphur Fe `As_(2)S_(3)` Solution :On shaking with the DISPERSION medium, colloids directly form the colloidal sol. Hence, they are called INTRINSIC colloids. i.e., glue.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Excessive accumulation of organic matter in water bodies leads to

Excess of silver nitrate solution is added to 100 ml of 0.01 M pentaaqua chloro chromium (III) chloride solution .The mass of silver chloride obtained in grams is [Atomic mass of silver is 108]

Excess of NH_3 combine with sodium hypochlorite solution gives -

Excess of PCl_(5) reacts with conc , H_(2)SO_(4) giving

Excess of Na^(+) ions in human system causes

Excess of isopropyl alcohol is heated with conc. H_2SO_4 at 413 K, gives

Excess of KI reacts with CuSO_(4) solution and then Na_(2) S_(2) O_(3) solution is added to it . Which of the statements is incorrect for this reaction ?

Excess of glycol when dehydrated gives :

Excess of ethanol is heated with conc. H_2SO_4 at 413 K. the compound that distills is

Excess of copper and iron are removed mainly by which of the following chelating ligands via formation of coordination compounds?

Excess of copper in toxic proportions in plants/animals can be

Excess of copper and iron are removed by chelating ligands like ______

Excess of conc. H_(2)SO_(4) reacts with C_(2)H_(2)OH at 413 K to form.

Excess of concentrated sodium hydroxide can separate mixture of

CH_3MgI is made to react with acetone and the addition product formed is hydrolysed will give :

When CH_3MgI is made to react with acetone and the addition product formed is hydrolysed we get :

Excess of CH_(3)CO OH is reacted with CH-=CH in presence of Hg^(2+), the product is

Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N hydrochloric acid. The volume of hydrochloric acid required is

Excess of ammonia with sodium hypochloride solution in the presence of glue or gelatine gives.

Excess of bromo ethane reactswithalcholicammonia to give,

Excess of ammonia with sodium hypochlorite solution in the presense of gule or gelatin gives

Excess of AgNO_(3) solution was added to 2.2 g of commercial sample of common salt dissolved in water. The mass of dried precipitate of silver chloride was 2.11 g . Calculate the percent purity of common salt.

Excess of AgCl is added to 0.1 M solution of KBr at 298 K. Calculate the equilibrium concentrations of Br^(-) and Cl^(-) ions. E_(Cl^(-)//AgCl//Ag)^(@)=0.222" volt"E_(Br^(-)//AgBr//Ag)^(@)=0.095 volt

Excess nitratein drinkin watercan cause

Excess chlorine,when bubbled through aqueous ferrous bromide will yeild

Excess H^+ and Cl^+ ions from a colloidal solution of Fe(OH)_3 can be removed by

Excess chlorine is passed through boiling toluene, how many chloro deriatives would you get?

Except which alcohol, other alcohols are weaker acid than water?

Except ……………… other alkanes gives a mixture of nitro aklkanes due to C-C cleavage by nitration of alkanes.

Except……….all other amino acids are optically active.

Except helium, all the noble gases crystallize with cubic close packed structures. Derive an equation relating atomic radius to the density of cubic close packed solid of given mass and apply it to deduce the relative size of Ar and Xe if their densities are 1.4 g/cm and 2.83 g/cm^(3) respectively.

Except glycine all other naturally occurring amino acids are optically active.

Except for vitamin B_(12) all other vitamins of group B should be regularly supplied in diet. Why?

Except for vitamin B_12, all other vitamins of group B, shlould be supplied regularly in diet. Why ?

Which statement correctly the statement ? Except for glycine, which is achiral, all the amino acids present in proteins....

Except ............ elements, all transition metals are hard and have very high melting point

Except ………………. all other alcohols are weaker acid than water.

Except_________ all elementfrom Rfto Cnare syntheticallyprearedand have verylowhalflifeperiods .

Examples of thermoplastic polymer is/are :

Examples for natural polymers are

Example the function of H_(2)-O_(2) fuel cell.

Examples of regional pollution are

Example of unit cell with crystallographic dimensions a!=b!=c, alpha=beta=gamma=90^(@) is :

Example showing ionisation isomerism

Example of Ring silicate is ………….

Example of neutral complex compound in the following list

Exampleof intrinsic colloid is