94420 + Interview Questions in Chemistry in Class 12

1.	Blue colouredpseudonitrolis formedfromnitrous acidand what
Answer» `CH_(3) - NO_(2)` `CH_(3) - UNDERSET(NO_(2))underset(\|)(CH) - CH_(3)` `C_(2)H_(5) - NO_(2)` `(CH_(3))_(2) - NO_(2)` Solution :Secondary nitroalkanegive bluecolouredpseudonitoralwith`HNO_(2)`

Discussion

2.	Blue coloured compound are obtained when
Answer» `Fe^(2+)` ion REACT with potassium ferriyanide `Fe^(3+)` ion react with potassium FERROCYANIDE `Fe^(3+)` ion react with potassium ferriyanide `Fe^(2+)` ion react with potassium ferroyanide Answer :a,B

Discussion

3.	Blue coloured compound is obtained when :
Answer» `Fe^(2+)` ions react with POTASSIUM ferrocyanide `Fe^(3+)` ions react with potassium ferrocyanide `Fe^(3+0` ions react with potassium ferrocyanide `Fe^(3+)` ions react with potassium sulphocyanide . SOLUTION :`4FeCl_3 + underset("Pot. Ferrocyanide")(3K_4[Fe(CN)_6]) to underset("Deep blue colouration")(Fe_4[Fe(CN)_6]) + 12 KCl `

Discussion

4.	Blue colour/ precipitate will be obtained when K_4[Fe(CN)_6] reacts with :
Answer» Fe(II) IONS CU(II) ions Fe(III) ions Cu(I) ions Answer :C

Discussion

5.	Blue colour of the sky is due to
Answer» SCATTERING of blue LIGHT by DUST particles Scattering of blue light by water scattering of blue light by dust particles and water None of the above Answer :C

Discussion

6.	Blue colour of copper sulphate is slowly discharged when an iron rod is dipped into it. Explain this by calculating DeltaG^(@)with the help of the following data : [E_(Cu^(2+)//Cu)^(@) = 0.34 V, E_(Fe^(2+)//Fe)^(@) = -0.44 V and 1 Faraday = 96500 C mol^(-1)]
Answer» Solution :`E_("cell")^(@) = E_("Cu^(2+)//Cu)^(@) - E_(Fe^(2+)//Fe)^(@) = +0.34 V - (-0.44 V) = +0.78 V` We have the equation `DeltaG^(@) =-nFE_("cell")^(@) = -2 xx 96500 C MOL^(-1) xx 0.78 V = -19301 J mol^(-1) = -19.3 kJ mol^(-1)` As the value of `DeltaG^(@)`is NEGATIVE, the reaction will take PLACE. That means BLUE colour of copper sulphate is slowly discharged.

Discussion

7.	Blue colour of 'C' is due to the formation of
Answer» `Mn^(+2)` `CrO_(5)` `I_(2)` `H_(2)TiO_(4)` Solution :`H_(2)TiO_(4)` (Yellow Colour) (A)

Discussion

8.	Blue borax bead is obtained with
Answer» Zn COBALT Chromium Fe Solution :`CoO+B_(2)O_(3) OVERSET(HEAT)tounderset("Cobalt metaborate (blue)")(Co(CO_(2))_(2)`

Discussion

9.	Blow holes of steel are removed by adding:
Answer» C Ni Sand Spiegeleisen Answer :D

Discussion

10.	Blood transports:
Answer» Oxygen CARBON dioxide Oxygen and carbon dioxide None of the above Answer :C

Discussion

11.	Blood sugar is the same as,
Answer» Fructose Galactose GLUCOSE GLYCOGEN ANSWER :C

Discussion

12.	Blood sugar is the same as
Answer» Glucose Galactose GLYCOGEN FRUCTOSE ANSWER :A

Discussion

13.	Blood red colour solution is produced when ferric chloride solution is treated with:
Answer» `KCN` `KSCN` `KCNO` `K_3[Fe(CN)_6]` ANSWER :B

Discussion

14.	Bloodsugar is thesame as …….. .
Answer» GLUCOSE GALACTOSE GLYCOGEN FRUTOSE ANSWER :D

Discussion

15.	Blood sugar and grape sugar are respectively
Answer» GLUCOSE, FRUCTOSE fructose, glucose glucose ( of both ) fructose (of both) ANSWER :C

Discussion

16.	Blood protein is
Answer» Albumin Haemoglobin Both (a) and (B) None Answer :C

Discussion

17.	Blood is a colloidal solution of water containing
Answer» LIQUID fat as dispersed phase Albuminoid as dispersed phase BUTTER as dispersed phase Proteins as dispersed phase Answer :B

Discussion

18.	Blood is:
Answer» STRONG acidic Strongly basic Neutral Slightly basic Answer :D

Discussion

19.	Blood is isotonic with
Answer» `0.16 M NACL` CONC. NaCl `50% NaCl` `30% NaCl` ANSWER :A

Discussion

20.	Blood has not bee synthesized in the laboratory so far. Therefore, we always depend on the supply of human blood to save the life of patients. To meet the ever increasing demand of human blood, blood donation camps are organised in schools/colleges and other organisations dedicated to social work. to meet the challenge of short supply of human blood, chemists have been making efforts to find out some substitutes for human blood which can atleast supply enough oxygen to save the life of patients. theiir efferts have resulted in the discovery of such chemicals called blood extenders. these compounds have been used to treat premature babies, whose lungs are often under developed. (i) What is the composition of blood extenders? (ii)Discuss the mode of their action.
Answer» Solution :(i) Blood EXTENDERS are perfluorocarbons such as perfluorodecalin. (ii) Blood extenders DISSOLVE gases like `O_(2)` and `CO_(2)` and thus serve as temporary SUBSTITUTES for haemoglobin-the oxygen carrying protein in blood.

Discussion

21.	Blood has been found to be isotonic with :
Answer» Normal SALINE SOLUTION SATURATED NaCl solution Saturated KCL solution Staurated solutionof a 1 : 1 mixture of NaCl and KCl Answer :A

Discussion

22.	Blood haemoglobin contains the metal
Answer» Al Mg Cu Fe Answer :D

Discussion

23.	Blood haemoglobin contains:
Answer» Al Mg Cu Fe Answer :C

Discussion

24.	Blood clots due to :
Answer» RBC WBC Platelets Globulins Answer :C

Discussion

25.	Blood cells retain their normal shapes in solutions which are :
Answer» Isotonic to blood HYPOTONIC to blood Hypertonic to blood Isoelectronic to blood ANSWER :A

Discussion

26.	Blood cells do not shrink in blood because blood is :
Answer» Hypotonic Isotonic Equimolar Hypertonic. Answer :B

Discussion

27.	Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing. (a) 1.2% sodium chloride solution? (b) 0.4% sodium chloride solution.
Answer» Solution :(II) (a) exosmosis TAKES place RESULTING in shrinking of cells (B) endosmosis takes place resulting in swelling of cells.

Discussion

28.	Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we palace blood cells in a solution containing 1.2% sodium chloride solution (ii) 0.4% soldium chloride solution
Answer» SOLUTION :(i) BLOOD CELLS shring (II) Blood cells SWELL.

Discussion

29.	Blood calcium level can be increased by the administration of
Answer» GLUCOGON calcitionin thyroxine paratharmone ANSWER :D

Discussion

30.	Blood calcium level can be increased by the admiistration of
Answer» Glucogon Calcitonin Thyroxine Parathormone Answer :D

Discussion

31.	Blocks of magnesium metal are often strapped to the steel hulls of ocean going ships in order to :
Answer» Provide cathodic protection Protect OXIDATION of steel Both (a) and (b) correct Neither (a) nor (b) is correct Answer :C

Discussion

32.	Blister Cu is about :
Answer» 60% CU 98% Cu 90% Cu 100% Cu Answer :C

Discussion

33.	Blistered copper is………………
Answer» 98% PURE COPPER 96% pure copper 97% pure copper 88% pure copper Answer :A

Discussion

34.	Blister copper obtained during extraction from cuprous oxide is called so because
Answer» it has blister like eruptions due to evolution of GAS. it has a shining SURFACE like blister it is the most impure FORM of copper its surface is uneven due to different thickness at different places. Solution :Solified copper obtained is called blister copper since it has BLISTERED appearance due to the evolution of sulphur DIOXIDE gas. `2Cu_(2)O + Cu_(2)S to 6Cu + SO_(2)`

Discussion

35.	Blister copper is refined by stirring moltem impure metal with green logs of wood because such a wood liberated hydrocarbon gases like (CH_(4)). The process X is called _____ and the Metal contains impurity of Y is ____:
Answer» X = POLING, `Y=cuO_(2)` X = CUPELLATION, `Y=CuO` X = cupellation, `Y=ZnO` X = poling, `Y=Cu_(2)O` ANSWER :D

Discussion

36.	Blister copper is obtained by:
Answer» Bessemerisation Roasting poling Refining Answer :A

Discussion

37.	Blister copper is :
Answer» Pure COPPER ALLOY of copper Copper CONTAINING some impurity ORE of copper Answer :C

Discussion

38.	Blister copper is ________.
Answer» 99% PURE copper 99.95% pure copper 99.99% pure copper 99.95-99.99% pure copper Answer :A

Discussion

39.	Bleeding of blood is stopped due to
Answer» the COAGULATION of BLOOD by appplying `FeCl_3` and blood vessel is SEALED the coagulation of blood by applying Alum and blood vessel is sealed blood COMBINES with the `FeCl_3` blood combines with Alum Solution :Blood is -ve COLLOID coagulated by adding alum (or) `FeCl_3`

Discussion

40.	Bleeding is stopped by the application of ferric chloride. This is because ...
Answer» ferric chloride SEAL the blood CELLS blood starts FLOWING in ohter DIRECTION blood is coagulated and blood vessel is sealed blood is peptised Solution : blood is coagulated and blood vessel is sealed

Discussion

41.	Bleeding gums are caused by deficiency of :
Answer» Thiamine Ascorbic acid Folic acid Vitamin E Answer :B

Discussion

42.	Bleeding due to a cut can be stopped by applying ferric chloride solution in the laboratory. This is due to
Answer» COAGULATION of NEGATIVELY charged blood particles by`Fe^(3+)` ions Coagulation of positively charged blood particles byClior Reaction taking PLACE between ferric ions and the haemoglobin forming a complex Common element, iron, in both FeCl3 and haemoglobin Solution :The colloidal blood particles are negatively charged which are coagulated by `Fe^(3+)`ions and the bleeding of the cut stops.

Discussion

43.	Bleching powder is used as
Answer» Oxidisingagnet bleaching agent Chlorinating agent All the above Solution :Bleaching POWDER slowly LOSES its ACTIVITY when it STANDS in air. This is DUE to loss of avaialable chlorine

Discussion

44.	Bleaching powder when treated with excessof dil. H_(2) SO_(4) liberates
Answer» `Cl_(2)` `O_(2)` both `O_(2)` and `Cl_(2)` NONE ANSWER :A

Discussion

45.	Bleaching properties of bleaching powder are due to its:
Answer» OXIDISING properties Reducing properties Basic properties Disinfecting properties Answer :A

Discussion

46.	Bleaching powder reacts with insufficient dilute acids the gas liberated is
Answer» `Cl_(2)`<BR>`O_(2)` `Br_(2)` `I_(2)` ANSWER :B

Discussion

47.	Bleaching powder slowly loses its activity when it stands in air. This is due to:
Answer» REACTION with moisture to liberate `O_2` Reaction with `CO_2` to evolve `Cl_2` LOSS of `CaCl_2` Formation of `CA(OH)_2` Answer :B

Discussion

48.	Bleaching powder slowly loses its activity when its stand in air. This is due to
Answer» reaction with water to EVOLVE `O_(2)` reaction with `H_(2)O` to evolve `H_(2)` Due to DISPROPORTIONATION formation of clacium hydroxide Answer :C

Discussion

49.	Bleaching powder slowly decomposes to form
Answer» `CaCl_(2) and CA(ClO_(3))` `CAO and Cl_(2)` `CaCl_(2) and Ca(OCl)_(2)` `CaCO_(3) and Cl_(2)` ANSWER :A

Discussion

50.	Bleaching powder on standing forms mixture of:
Answer» `CAO + Cl_2` `HOCL + Cl_2` `CaCl_2 + Ca(ClO_3)_2` `CaO + CaCl_2` Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Blue colouredpseudonitrolis formedfromnitrous acidand what

Blue coloured compound are obtained when

Blue coloured compound is obtained when :

Blue colour/ precipitate will be obtained when K_4[Fe(CN)_6] reacts with :

Blue colour of the sky is due to

Blue colour of copper sulphate is slowly discharged when an iron rod is dipped into it. Explain this by calculating DeltaG^(@)with the help of the following data : [E_(Cu^(2+)//Cu)^(@) = 0.34 V, E_(Fe^(2+)//Fe)^(@) = -0.44 V and 1 Faraday = 96500 C mol^(-1)]

Blue colour of 'C' is due to the formation of

Blue borax bead is obtained with

Blow holes of steel are removed by adding:

Blood transports:

Blood sugar is the same as,

Blood sugar is the same as

Blood red colour solution is produced when ferric chloride solution is treated with:

Bloodsugar is thesame as …….. .

Blood sugar and grape sugar are respectively

Blood protein is

Blood is a colloidal solution of water containing

Blood is:

Blood is isotonic with

Blood has been found to be isotonic with :

Blood haemoglobin contains the metal

Blood haemoglobin contains:

Blood clots due to :

Blood cells retain their normal shapes in solutions which are :

Blood cells do not shrink in blood because blood is :

Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing. (a) 1.2% sodium chloride solution? (b) 0.4% sodium chloride solution.

Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we palace blood cells in a solution containing 1.2% sodium chloride solution (ii) 0.4% soldium chloride solution

Blood calcium level can be increased by the administration of

Blood calcium level can be increased by the admiistration of

Blocks of magnesium metal are often strapped to the steel hulls of ocean going ships in order to :

Blister Cu is about :

Blistered copper is………………

Blister copper obtained during extraction from cuprous oxide is called so because

Blister copper is refined by stirring moltem impure metal with green logs of wood because such a wood liberated hydrocarbon gases like (CH_(4)). The process X is called _____ and the Metal contains impurity of Y is ____:

Blister copper is obtained by:

Blister copper is :

Blister copper is ________.

Bleeding of blood is stopped due to

Bleeding is stopped by the application of ferric chloride. This is because ...

Bleeding gums are caused by deficiency of :

Bleeding due to a cut can be stopped by applying ferric chloride solution in the laboratory. This is due to

Bleching powder is used as

Bleaching powder when treated with excessof dil. H_(2) SO_(4) liberates

Bleaching properties of bleaching powder are due to its:

Bleaching powder reacts with insufficient dilute acids the gas liberated is

Bleaching powder slowly loses its activity when it stands in air. This is due to:

Bleaching powder slowly loses its activity when its stand in air. This is due to

Bleaching powder slowly decomposes to form

Bleaching powder on standing forms mixture of:

Blister copper is refined by stirring moltem impure metal with green logs of wood because such a wood liberated hydrocarbon gases like (CH_(4)). The process X is called _ and the Metal contains impurity of Y is :