94420 + Interview Questions in Chemistry in Class 12

1.	Milk is an aerosol.True /False.
Answer» SOLUTION :Imulsion

Discussion

2.	Milk is a colloid in which :
Answer» a LIQUID DISPERSED in liquid a SOLID dispersed in liquid a gas is dispersed in liquid some sugar is dispersed in water Answer :A

Discussion

3.	Milk is:
Answer» FAT DISPERSED in milk fat dispersed water water dispersed in fat water dispersed in oil Answer :B

Discussion

4.	Milk contains vitamins
Answer» A, D and E `A,B_(12) and D` `C, D and K` `A,B_(1) and D` ANSWER :D

Discussion

5.	Milk changes after digestion into :
Answer» CELLULOSE Fructose Glucose Lactose ANSWER :C

Discussion

6.	Milk change after digestion into
Answer» Cellulose Fructose GLUCOSE LACTOSE Solution :Milk contains lactose which is a disaccharide. Disaccharide on hydrolysis YIELDS two monosaccharides. `underset("(Milk)")("Lactose") overset(H_(2)O)underset(H^(+))to ` glucose + Glactose

Discussion

7.	Milk can be preserved by adding a few drops of ......
Answer» HCOOH HCHO `CH_3COOH` `CH_3CHO` SOLUTION : HCHO

Discussion

8.	Mild oxidation of carboxylic acids occurs at ………………..position :
Answer» `ALPHA` `BETA` `GAMMA` `DELTA` Answer :C

Discussion

9.	Mild oxidation of 2-propanol yields:
Answer» ACETIC acid Acetone 1-propanol Propanal Answer :B

Discussion

10.	Mifepristone is used as
Answer» antimicrobial antimalarial antifertility DRUG tranquillizer Answer :C

Discussion

11.	Microcosmic salt bent test in which Na(NH_(4))H. PO_(4). 4H_(2)O is first doydratedwhich forms sodium metaposphate (NaPO_(2)) as colourlessheadwhich reacts with metals oxide givingcolouredhead.Thistest is solable is soluble for Cu,Cr and Co .Theblueheated withCuO andCoO are due theformationof ____and ___white greenheadwith Cr_(2)O_(3) isdue to the formation of ____.
Answer» Answer :`NaCuPO_(4),NaCuPO_(4),NAPO_(3),Cr_(2)O_(3)`

Discussion

12.	microcosmic salt bead test of salt (X) yields semi - translucent mass. Therefore it contains
Answer» `CO(NO_3)_2` `CA(NO_3)_2` `CuSO_4` `MnSO_4` ANSWER :B

Discussion

13.	Microbial activity are minium at pH
Answer» 8 to 9 4 to 5 7 to 8 10 to 11 Answer :B

Discussion

14.	Micro-cosmic salt is
Answer» `Na_2 HPO_4.2H_2O` `(NH_4)_2HPO_4. 2H_2O` `NA(NH_4)HPO_4. 4H_2O` NONE of these Answer :C

Discussion

15.	Microbes can be killed by using
Answer» PENICILLIN Tetracycine CHLORAMPHENICOL VANCOMYCIN SOLUTION :both penicillin and vancomyain are bacterio cidic

Discussion

16.	Micelles may be formed by aggregates of soap anions in water as the anions are
Answer» hydrophilic hydrophobic diphilic (one hydrophilic head being attached to a long hydrophobic tail) carriers of electricity. Solution :Soaps (RCOONA) DISSOCIATE in water to give `RCOO^(-)` and `Na^(+)`. The `RCOO^(-)` ions consist of two parts (1) non POLAR long HYDROCARBON chain R called the tail which is hydrophobic and the polar group `COO^(-)` called the head which is hydrophilic. An aggregate of ions THUS formed is called micelle

Discussion

17.	Micelles are formed from concentrated soap solutions above critical micelle concentration. Micelles are regarded as associate colloids as soap ions associate to give micelles. During micelle formation ........... in solution
Answer» VantHoff FACTOR increases Colligative propertis increases VantHoff factor decreases ENTROPY decreases Solution :In MICELLE FORMATION i factor `darr`

Discussion

18.	Micelles are formed from concentrated soap solutions above critical micelle concentration. Micelles are regarded as associate colloids as soap ions associate to give micelles. Which of the following give a positive micelle ?
Answer» `CH_3-CH(CH_3)_2 -(CH_2)_(5)-N(CH_3)_2//HCl` `C_17 H_35 COOH//KOH` `C_12H_25SO_3H//KOH` `C_17H_35COONa` SOLUTION :`CH_3-underset(CH_3)underset(\|)overset(CH_3)overset(\|)(C)-(CH_2)_(5) - underset(CH_3)underset(\|)overset(CH_3)overset(\|)(NH^+)-CL^(-)`

Discussion

19.	Micelles have:
Answer» higher colligative PROPERTIES as compared to COMMON colloidal sols. LOWER colligative properties same colligative properties NONE is true Answer :B

Discussion

20.	Micelles are formed from concentrated soap solutions above critical micelle concentration. Micelles are regarded as associate colloids as soap ions associate to give micelles. Concentration of uniform 'micelle’ particles at CMC of a surfactant solution is 0.004M. Charge carried by each micelle is 4 xx 10^(-17) coloumbs. What is the molar concentration of the surfactant (soap) at CMC ?
Answer» `1M` `0.5 M` `0.2 M` `0.3 M` Solution :Micelle conc - 0.004 M , charge `1.6 x X10^(-19)C rarr 1` stearate ion `4 XX 10^(-17) rarr ? "" 250` In each micalle no. of STERATE ions = 250 . Then molar conc `0.004 xx 250 = 1M`.

Discussion

21.	MIC (which is responsible for Bhopal gas tragedy) can be produced by which of the following test
Answer» MULLIKEN test Carbylamine test Victor-Meyer test Libermann Nitrose test Answer :B

Discussion

22.	Mica is chemically :
Answer» Potassium ALUMINOSILICATE having SHEET structure Calcium aluminosilicate having FIBROUS structure Calcium MAGNESIUM silicate having three dimensional network Hydrated sodium aluminosilicate having three dimensional network Answer :A

Discussion

23.	Micelles are:
Answer» IDEAL SOLUTION ASSOCIATED colloids Adsorbed surfaces Adsorbed solutes Answer :B

Discussion

24.	MgSO_(4).7H_(2)O on heating above 503 K gives :
Answer» `MgSO_(4).H_(2)O` `MgSO_(4)` `MgO+SO_(3)` `Mg+SO_(2)+SO_(3)` Answer :C

Discussion

25.	MgSO_(4) on reaction with NH_(4)OH and Na_(2)HPO_(4) forms a white crystalline precipitate. What is its formula
Answer» `MG(NH_(4))PO_(4)` `Mg_(3)(PO_(4))_(2)` `MgCl_(2),MgSO_(4)` `MgSO_(4)` SOLUTION :Test of `Mg^(+2)` ion `Mg^(+2)+NH_(4)OH+Na_(2)HPO_(4)toMg(NH_(4))PO_(4)`.

Discussion

26.	MgSO_(4) +NH_(4)OH + Na_(2)HPO_(4) to white crystalline precipitate.The formula of crystalline precipitate is:
Answer» `MgCl_(2).MgSO_(4)` `MgSO_(4)` `MG(NH_(4))PO_(4)` `Mg(PO_(4))_(2)` SOLUTION :`MgSO_(4)` on reaction with `Na_(2)HPO_(4)` in presence of `NH_(4)OH` gives WHITE PRECIPITATE of `Mg(NH_(4))PO_(4)` `MgSO_(4)+Na_(2)HPO_(4) + NH_(4)OH to Mg(NH_(4))PO_(4)darr+Na_(2)SO_(4)+H_(2)O`

Discussion

27.	Mg_((s))+Cu^(2+)(aq)toCu_((s))+Mg^(2+)(aq) If the standard reduction potential of Mg and Cu are -2.37 and +0.34V respectively. The emf of the cell is
Answer» 2.03V `-2.03V` `+2.71V` `-2.71V` SOLUTION :`E_(CELL)^(@)=E_("CATHODE")-E_("ANODE")^(@)=0.34-(2.37)=+2.71V`

Discussion

28.	Mg(s) + 2Ag^(+)(0.0001M) to 2Ag(s) + Mg^(2+) (0.13 M). Calculate the E_("cell") is given as 3.17 V.
Answer» Solution :`E_("cell")` is written DIRECTLY from `E_("cell")^(@)` as, `E_("cell") = E_("cell")^(@) - (RT)/(2F) "LN" ([Mg^(2+)])/([Ag^+]^(2)) "(or)" E_("cell") = 3.17 - (0.059)/2 "log" (0.13)/((0.0001)^(2))` `E_("cell")` of the GIVEN reaction = `3.17 - 0.21 = 2.96 V`.

Discussion

29.	Represent the cell in which the following reaction takes place Mg(s)+2Ag^(+)(0.0001M) to Mg^(2+) (0.130M)+2Ag(s) Calculates its E_(cell) if E_("cell")^(Θ)=3.17V
Answer» SOLUTION :`E_("cell")` is written directly from `E_("cell")^(@)` as, `E_("cell")=E_("cell")^(@) -("RT")/(2F) ln.([MG^(2+)])/([Ag^(+)]^(2))` (or) `E_("cell")=3.17 - (0.059)/(2) LOG.(0.13)/((0.0001)^(2))` `E_("cell")` of the given reaction `=3.17-0.21=2.96V`.

Discussion

30.	Mg(OH)_2 , Al(OH)_3 , omeprazole, Lansoprazole , sodium benzoate , sodium propionate among them number of antacids medicines ?
Answer» SOLUTION :SODIUM BENZOATE , propionates are FOOD PRESERVATIVE

Discussion

31.	Mg(OH)_2 + Al(OH)_3 Mixture is better antacid than NaHCO_3 because
Answer» `NaHCO_3` Solubilty in WATER is less than `Mg(OH)_3` & `Al(OH)_3` `Al(OH)_3 and Mg(OH)_2` are insoluble in water, these donot raise `P^(H)` beyond 7 Less acid will be produced due to EXCESSIVE `HCO_3^(-)` `NaHCO_3` is stomach irritant Answer :B

Discussion

32.	MgO has the structure of NaCl and TICI has the structure of CsCl. What are the coordination number of ions in MgO and TICI ?
Answer» SOLUTION :In MgO, the C.N. of `MG^(2+) = 6`, C.N. of `O^(2-)= 6` In TICI, the C.N. of `T^(+) = 8`, C.N. of `Cl^(-) = 8`.

Discussion

33.	MgO crystallized as rock salt. The number of nearest oxide ions to Mg^(2+)ion is
Answer» TWO four SIX TWELVE ANSWER :C

Discussion

34.	MgO can be reudced with
Answer» Silicon FERRO- Silicion `CaC_(2)` AL the above Answer :D

Discussion

35.	MgFe_2 O_4 has spinel structure , then the percentge of tetrahedral voids and the octahedral voids occupied are respectively
Answer» 25% & 37.5% 12.5% & 50% 25% & 25% 37.5% & 25% ANSWER :B

Discussion

36.	MgCl_(2).6H_(2)O on heating gives anhydrous MgCl_(2)
Answer» ANSWER :F

Discussion

37.	MgCl_(2).6H_(2)O when heated gives
Answer» MAGNESIUM oxychloride Magnesium dichloride Magnesium oxide Magnesium chloride Solution :`MgCl_(2).6H_(2)O overset("Heat")to MGO +5H_(2) O +2HCL`

Discussion

38.	Mg_(3)N_(2)(s)+H_(2)O overset(R.T.)to P darr+Q uarr Excess 'Q' gas does not form coloured complex with:
Answer» `Ni^(2+)(AQ.)` `Zn^(2+)(aq.)` `Cr^(3+)(aq.)` `Cu^(2+)(aq.)` Solution :`Mg_(3)N_(2)(s)+H_(2)O overset(R.T.)to underset(P)(Mg(OH)_(2)darr)+underset(Q)(NH_(3))uarr` `underset((3D^(10)4s^(0)))(overset(+II)(Zn)(aq.))+4NH_(3) hArr underset(("colourless complex ion"))([Zn(NH_(3))_(4)]^(2+))`

Discussion

39.	Mg_2C_3 has the following characteristics:
Answer» It is CALLED magnesium allylenide It contains`Mg^(2+)` and `C_3^(4-)` ions It on HYDROLYSIS gives propyne All of the above Answer :D

Discussion

40.	Mg^(2+) is isoelectronic with
Answer» `Cu^(2+)` `ZN^(2+)` `Na^(+)` `CA^(2+)` Solution :`Mg^(2+)` electronic CONFIGURATION : `1 s^(2) 2s^(2) 2p^(6)`. `Na^(+)` electronic configuration : `1 s^(2) 2s^(2) 2p^(6)` as both posses same number of electrons i.e. ISOELECTRONIC effect.

Discussion

41.	Mg on heating to redness in an atmosphere of N_2 and then on treating with H_2O gives:
Answer» `NH_3` `H_2` `N_2` `O_2` ANSWER :A

Discussion

42.	Mg is not precipitated in V group because
Answer» `MgCO_3` is soluble in WATER `MgCO_3` is soluble in `NH_4 CL` `MgCO_3` is soluble in `NH_4OH` NONE of these. Solution :The CONCENTRATION of `CO_(3)^(2-)` ions is very low which does not allow the ionic product of `Mg^(2-)` and `CO_(3)^(2-)` ions to exceed the solubility product in presence of `NH_4 Cl`.

Discussion

43.	Mg is not precipitated in group V because
Answer» `MgCO_(3)` is soluble in water `MgCO_(3)` is soluble in `NH_(4)Cl` `MgCO_(3)` is soluble in `NH_(4)OH` NONE Solution :The concentration of `CO_(3)^(2-)` ions is very LOW which does not prevent the ionic product of `Mg^(2+)` and `CO_(3)^(2-)` ions to surpass the solubility product in the PRESENCE of `NH_(4)Cl`

Discussion

44.	Mg is not precipitate in group Vbecause
Answer» `MgCO_(3)` INSOLUBLE in `H_(2)O` `MgCO_(3)` insoluble in `NH_(4)CI` `MgCO_(3)` insoluble in `NH_(4)OH` All Answer :b

Discussion

45.	Mg is an important component of
Answer» HEMOGLOBIN CHLOROPHYLL ATP Florigen. Answer :B

Discussion

46.	Mg + Cu^(2+) to Mg^(2+) +Cu , What is E_("cell")^(0) ? E_(Mg^(2+)//Mg)^(0)=-2.36 V, E_(Cu^(2+)//Cu)^(0)=0.34 V
Answer» `2.7 V` 2.7 V `-2.02 V` `2.02 V` SOLUTION :`E_(cell)^(0)=E_(cathode)^(0)-E_(ANODE)^(0) =0.34-(-2.36)=2.7 V`

Discussion

47.	Mg can reduce NO_(3)^(-)" to " NH_(3) in basic medium. NO_(3)^(-) + Mg (s) + H_(2)O to Mg (OH)_(2)(s) + OH^(-) (aq) + NH_(3)(g) A 25.0 ml sample of NO_(3)^(-) solution was treated with Mg. The NH_(3)(g) waspassed into 50 ml of 0.15 N HCl . The excess of HCl required 32.10 ml of 0.10 g NaOH for neutralization . What was the molarity of NO_(3)^(-) ions in the original sample ?
Answer» SOLUTION :MEQ . of`NH_(3)` formed = Meq. of HCl used `= 50 xx 0.15 - 32.10 xx 0.10` ` = 4.29` Here, N-factor of `NH_(3)` is 1 (acid - base reaction) For REDOX change, (n- factor = 8) ` :. ` Meq. of `NH_(3)` for n- factor `8 = 8 xx 4.29` ` :. ` Normality of `NO_(3)^(-) = (34.32)/25 = 1.37` Molarity of `NO_(3)^(-) = (1.37)/8 = 0.176`

Discussion

48.	Mg burns with a brilliant flame.This property is used in:
Answer» Fireworks Military signalss Photographic FLASH bulbs All of the above Answer :D

Discussion

49.	Mg burns in:
Answer» `N_2` CO `NO_2` NONE of these Answer :A

Discussion

50.	Mg + "air" overset("Ignition") rarrA+ B (Insoluble ) A overset(dil.Hcl)rarrC+Duarr CuO+Doverset(Delta)rarrEuarrWhich can Increase the solubility of AgCI in water ?
Answer» B D E C Solution :`5Mg+underset("air")(ubrace(N_2+O_2))OVERSET(Delta)rarrunderset((A))(Mg_(3)N_(2))+underset("insoluble")underset(uarr(B))(MgOdarr)underset((A))(Mg_3N_2)+underset("dil)(6HCl)rarrunderset((C))(3MgCl_2)+underset((D))(2NH_3)uarr3CuO+underset((D))(2NH_3)rarr3Cu+underset((E))(N_2)uarr+3H_2O` `D-NH_3` - increases the solubility of AgCl in water `Agcl +2NH_(3)rarr[Ag(NH_3)_(2)]^(+)+Cl^(Theta)`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Milk is an aerosol.True /False.

Milk is a colloid in which :

Milk is:

Milk contains vitamins

Milk changes after digestion into :

Milk change after digestion into

Milk can be preserved by adding a few drops of ......

Mild oxidation of carboxylic acids occurs at ………………..position :

Mild oxidation of 2-propanol yields:

Mifepristone is used as

microcosmic salt bead test of salt (X) yields semi - translucent mass. Therefore it contains

Microbial activity are minium at pH

Micro-cosmic salt is

Microbes can be killed by using

Micelles may be formed by aggregates of soap anions in water as the anions are

Micelles are formed from concentrated soap solutions above critical micelle concentration. Micelles are regarded as associate colloids as soap ions associate to give micelles. During micelle formation ........... in solution

Micelles are formed from concentrated soap solutions above critical micelle concentration. Micelles are regarded as associate colloids as soap ions associate to give micelles. Which of the following give a positive micelle ?

Micelles have:

MIC (which is responsible for Bhopal gas tragedy) can be produced by which of the following test

Mica is chemically :

Micelles are:

MgSO_(4).7H_(2)O on heating above 503 K gives :

MgSO_(4) on reaction with NH_(4)OH and Na_(2)HPO_(4) forms a white crystalline precipitate. What is its formula

MgSO_(4) +NH_(4)OH + Na_(2)HPO_(4) to white crystalline precipitate.The formula of crystalline precipitate is:

Mg_((s))+Cu^(2+)(aq)toCu_((s))+Mg^(2+)(aq) If the standard reduction potential of Mg and Cu are -2.37 and +0.34V respectively. The emf of the cell is

Mg(s) + 2Ag^(+)(0.0001M) to 2Ag(s) + Mg^(2+) (0.13 M). Calculate the E_("cell") is given as 3.17 V.

Represent the cell in which the following reaction takes place Mg(s)+2Ag^(+)(0.0001M) to Mg^(2+) (0.130M)+2Ag(s) Calculates its E_(cell) if E_("cell")^(Θ)=3.17V

Mg(OH)_2 , Al(OH)_3 , omeprazole, Lansoprazole , sodium benzoate , sodium propionate among them number of antacids medicines ?

Mg(OH)_2 + Al(OH)_3 Mixture is better antacid than NaHCO_3 because

MgO has the structure of NaCl and TICI has the structure of CsCl. What are the coordination number of ions in MgO and TICI ?

MgO crystallized as rock salt. The number of nearest oxide ions to Mg^(2+)ion is

MgO can be reudced with

MgFe_2 O_4 has spinel structure , then the percentge of tetrahedral voids and the octahedral voids occupied are respectively

MgCl_(2).6H_(2)O on heating gives anhydrous MgCl_(2)

MgCl_(2).6H_(2)O when heated gives

Mg_(3)N_(2)(s)+H_(2)O overset(R.T.)to P darr+Q uarr Excess 'Q' gas does not form coloured complex with:

Mg_2C_3 has the following characteristics:

Mg^(2+) is isoelectronic with

Mg on heating to redness in an atmosphere of N_2 and then on treating with H_2O gives:

Mg is not precipitated in V group because

Mg is not precipitated in group V because

Mg is not precipitate in group Vbecause

Mg is an important component of

Mg + Cu^(2+) to Mg^(2+) +Cu , What is E_("cell")^(0) ? E_(Mg^(2+)//Mg)^(0)=-2.36 V, E_(Cu^(2+)//Cu)^(0)=0.34 V

Mg burns with a brilliant flame.This property is used in:

Mg burns in:

Mg + "air" overset("Ignition") rarrA+ B (Insoluble ) A overset(dil.Hcl)rarrC+Duarr CuO+Doverset(Delta)rarrEuarrWhich can Increase the solubility of AgCI in water ?