94420 + Interview Questions in Chemistry in Class 12

1.	Aspirin and Analgin are ____ drugs.
Answer» SOLUTION :non-narcotics

Discussion

2.	Aspirin, an antipyretic drug is chemically :
Answer» METHYL salicylate Ethyl salicylate Acetyl salicylic ACID o-hydroxy benzoic acid ANSWER :C

Discussion

3.	Aspirin acts as an analgesic because it
Answer» inhibits the synthesis of PROSTAGLANDINS which STIMULATE INFLAMMATION of the tissue prevents the RELEASE of HCL in the stomach prevents the interaction of histamine with its receptor inhibits activities of enzymes Answer :A

Discussion

4.	Aspirin act as
Answer» antioxidant antibiotic antisepti ANALGESIC and antipyretic Answer :D

Discussion

5.	Aspiriin can be prepared by the reaction of:-
Answer» Sallicylic acid with methanol in PRESENCE of `H_(2)SO_(4)` Salicyldehydewith acetic anhydride in presence of `H_(2)SO_(4)` SALICYLIC acid with acetic anhydride in presence of `H_(2)SO_(4)` Cinnamic acid with acetic anhydride in presence of `H_(2)SO_(4)` SOLUTION :N//A

Discussion

6.	Asphalt used for construction of roads is .........
Answer» an emulsion of ASPHALT in oil. an emulsion of asphalt in water. molten asphalt. a solution of asphalt in water. ANSWER :B

Discussion

7.	Aspartame, the artificial sweetener is made of a dipeptide of the amino acids,
Answer» aspartic ACID and phenylalanine aspartic acid and GLYCINE ALANINE and glycine aspartic acid and glucatamic acid. Answer :A

Discussion

8.	Aspartame is used as ………..
Answer» SOLUTION :An ARTIFICIAL SWEETENING AGENT.

Discussion

9.	Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening ?
Answer» SOLUTION :Since aspartame DECOMPOSES at cooking temperature, therefore, it is used as a SWEETENING agent in cold FOODS and SOFT drinks.

Discussion

10.	Aspartame is less preferred than sucralose as sweetner. Why?
Answer» Solution :Aspartame is not stable at cooking temperature but sucralose is stable. Aspartame is 160 times more sweeter than sucrose but sucralose is 550 times more sweeter than sucrose. For these reasons aspartame is less preferred than sucralose in FOODS as ARTIFICIAL sweetner.

Discussion

11.	Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening?
Answer» Solution :Aspartame is used in COLD FOODS and SOFT DRINKS because it is UNSTABLE at cooking temperature.

Discussion

12.	Asparmatge, an artificial sweetener is a peptide and has the following structure. Which of the following is correct about the molecule ?
Answer» It has FOUR FUNCTIONAL groups It has three functional groups on HYDROLYSIS it produces only one AMINO ACID on hydrolysis it produces a mixture of amino acids Answer :A::D

Discussion

13.	[A]:Sometimes rate of reactio does not depend on concentration. [R]:The order of reaction can be negative.
Answer» Assertion [A] and reason [R] both are correct and [R] gives correct explanation of [A] Assertion [A] and reason [R] both are correct but [R] does not give correct explanation of [A] Assertion [A] is wrong but Reason [R] is wrong Assertion [A] is wrong but Reason [R]is correct Solution :It can be possible that the rate of reaction does not DEPEND on concentration.Like some FAST reaction. The ORDER of reaction can be NEGATIVE,so both statement are correct but [R] is not the correct explanation of[A.

Discussion

14.	A(s)hArrH_(2)S(g)+B(g) At eq., pressure = 18 atm C(s)hArrH_(2)S(g)+D(g) At eq., pressure = 36 atm Calculation mole fraction of B in the mixture.
Answer» <P> Solution :`A(s)hArrunderset(x+y x)( H_(2)S(g))+B(g),K_(p_(1))=(9)^(2)=81` `C(s)hArrunderset(x+y y)(H_(2)S(g))+D(g),K_(p_(2))=(18)^(2)=324` mole fraction of B in mixture `=x/(2(x+y))` `=(k_(p_(1)))/(2(K_(p_(1))+K_(p_(2))))`

Discussion

15.	AsF_(5) molecule is trigonal bipyramidal. The orbitals of As atom involved in hybridisation are
Answer» <P>`d_(x^(2)-y^(2)),d_(z^(2)),s,p_(x),p_(y)` `d_(XY),s,p_(x),p_(y),p_(z)` `s,p_(x),p_(y),p_(z),d_(z^(2))` `d_(x^(2)-y^(2)),s,p_(x),p_(y),p_(z)` Solution :For trigonal bipyramidal, the hybridisation is `sp^(3)`d which INVOLVES `s,p_(x),p_(y),p_(z)` and `d_(z)^(2)` ORBITALS.

Discussion

16.	Asforption is accompained by
Answer» DECREASE in enthalpy anc increase in ENTROPY increase in enthalpy and increase in entropy decrease in enthalpy and decrease in entropy no CHANGE in enthalpy and entropy Solution :Adsorption isaccompanied by decrease in enthalpy `(DeltaH=- ve , ` and decrease in entorpy `(DeltaS=-ve).`

Discussion

17.	Ascorbic acid resembles the structure of
Answer» VITAMIN A Glucose Cellulose Vittamin D Answer :B

Discussion

18.	Ascorbic acid is a chemical name of:
Answer» `"VITAMIN " B_(12)` Vitamin D Vitamin C Vitamin K. Answer :C

Discussion

19.	Ascorbic acid is a……..
Answer» Hormone VITAMIN m PROTEIN NUCLEIC ACID Solution :Vitamin

Discussion

20.	Ascorbic acid is a/an :
Answer» VITAMIN C Enzyme PROTEIN NONE of these Answer :A

Discussion

21.	Ascorbic acid is a
Answer» PROTEIN Carbohydrate Answer :A

Discussion

22.	Ascorbic acid is a……….. .
Answer» VITAMIN ENZYME PROTEIN HORMONE ANSWER :A

Discussion

23.	Ascorbic acid belongs to which vitamin ?
Answer» SOLUTION :VITAMIN C

Discussion

24.	Ascorbic acid is:
Answer» VITAMINS C Enzyme Proteins Lipid Answer :A

Discussion

25.	Asbestos is chemically :
Answer» SILICATE of CALCIUM and magnesium Calcium alumino silicates Magnesium alumino silicates Calcium silicate + calcium aluminates Answer :A

Discussion

26.	As_2S_3 sol is negatively charged. Between sodium nitrate and aluminium nitrate which one is needed in large quantity to coagulate the above sol ?
Answer» SOLUTION :SODIUM NITRATE

Discussion

27.	As_(2)S_(3) sol is
Answer» POSITIVE COLLOID NEGATIVE colloid neutral colloid NONE of these Solution :negative colloid

Discussion

28.	As_2S_3 sol has a negative charge. Capacity to precipitate it is highest in:
Answer» `AlCl_3` `Na_3PO_4` `CaCl_2` `K_2SO_4` ANSWER :A

Discussion

29.	As_2S_3 is the example of
Answer» POSITIVE colloid negative colloid neutral colloid None of these. Answer :B

Discussion

30.	As_(2)S_(3) is solutionin(NH_(4))_(2)S_(2) (yellow ammonium sulphide) due to theformation of (a) _____.
Answer» ANSWER :a.`(NH_(4))_(3)AnS_(4)`

Discussion

31.	As_2S_3is solublein yellowammonium sulphide due to the formation of :
Answer» `(NH_4)_2S` `(NH_4)_3As S_4` `H_3AsO_4` `As_2S_3` sol. SOLUTION :`As_2S_3 + 3(NH_4)_2 S + 2S to underset("AMM. thioarsenate")(2(NH_4)_2 As S_4)`

Discussion

32.	As_(2)S_(3) is
Answer» Black Yellow Orange White Answer :d

Discussion

33.	As_(2)S_(3) and TiO_(2) sol are examples of
Answer» NEGATIVITY CHARGES sols POSITIVELY charged sols Positively and NEGATIVELY charged sols respectively Negatively and positively charged sold respectively Answer :D

Discussion

34.	As_(2)O_(5) is ............while Sb_(2)O_(5) is.................. .
Answer» SOLUTION :ACIDIC, AMPHOTERIC

Discussion

35.	As_2 S_3is ____shaped colloid.
Answer» disc plate ROD spherical Answer :D

Discussion

36.	As we shall soon see, sidium amide (NaNH_(2)) is useful, especially when a reaction requires a very strong base. Explain why a solvent such as methanol cannnot be used to carry out a reaction in which you might want to use sodium amide as a base.
Answer» SOLUTION :An alcohol has `pK_(a)=16-17`, and AMMONIA has `pK_(a)=38`. This means that methanol is a significantly stronger acid than ammonia, and the conjugate base of ammonia (the `""^(-)NH_(2)` ion) is a significantly stronger base than an ALKOXIDE ion. Therefore , the following acid-base reaction would take place as soon as sodium amide is added to methanol. `underset("Strongeracid")(CH_(3)OH)+underset("Strongerbase")(NaNH_(2)) underset(CH_(3)OH) rarrunderset("Weaker base")(CH_(3)ONa)+underset("Weakeracid")(NH_(3))` With a `pK_(a)` different this LARGE, the sodium amide would convert all of the methanol to sodium methoxide, a much weaker base than sodium amide. (This is an example of what is called the leveling effect of a solvent.

Discussion

37.	As we proceed from La(OH)_3 to Lu(OH)_3 basic strength increases / decreases.
Answer» SOLUTION :DECREASES

Discussion

38.	As the temperature increases, the pH of a KOH solution
Answer» Will decreases Will increases Remains constant Depends upon CONCENTRATION of KOH solution Solution :PH will decrease because `[OH^(-)]` increased due to this pOH is DECREASED.

Discussion

39.	As the speed of molecules increase, the number of collisions per second :
Answer» Decrease Increase Does not change None of these Answer :B

Discussion

40.	As the size of gold particle increases the colour of solution varies as
Answer» PURPLE `to` BLUE `to` GOLDEN `to` RED Golden `to` red `to` purple `to` blue Red `to` purple `to` blue `to` golden Blue `to` purple `to` golden `to` red Answer :C

Discussion

41.	As the s-character of hybridisation orbital increase, the bond angle
Answer» INCREASE Decreases BECOMES ZERO Does not change Answer :A

Discussion

42.	As the oxidation state for any metal increases,the tendency to show ionic nature:
Answer» Decreases Increases Remains same NONE of these Answer :A

Discussion

43.	As the number of carbon atoms in a chain increases the boiling point of alkanes
Answer» INCREASES Decreases Remains same May increase or decrease Solution :BOILING point of alkanes increases with the number of CARBON atoms because surface area increases which increases the Vander WAAL forces.

Discussion

44.	As the molecular weight increases the tensile strength of polymers
Answer» Increases Decreases REMAINS UNCHANGED Unecertain ANSWER :A

Discussion

45.	As the atomic number of the halogens increases, the halogens:
Answer» LOSE the OUTERMOST ELECTRONS LESS readily Become LIGHTER in colour Become less dense Gain electrons less readily Answer :D

Discussion

46.	As the atomic number of the halogens increases, the halogens :
Answer» LOSE their OUTERMOST ELECTRONS LESS readily become LIGHT dense become light in colour gain electrons less readily Answer :D

Discussion

47.	As Rhombic sulphur is heated in a test tube : {:(,"Process","Temperature"),((a),"Viscosity increases",T_(1)),((b),"Visconsity decrease",T_(2)),((c),"Paramagnetic molecules",T_(3)),((d),"Breakage of "S_(8) "rings",T_(4)),(,("Diradical formation in molten phase"),):} Correct order of temperature is
Answer» `T_(1) LT T_(3) lt T_(4) lt T_(2)` `T_(2) lt T_(4) lt T_(3) lt T_(1)` `T_(4) lt T_(1) lt T_(2) lt T_(3)` `T_(3) lt T_(4) lt T_(1) lt T_(2)` Answer :C

Discussion

48.	As temperature increases, vapour pressure of a liquid
Answer» INCREASES linearly decreases linearly increases exponenyially decreases exponentially Answer :C

Discussion

49.	As percentage of carbon increases in iron, its hardness,
Answer» Decreases Increases Remains same None Answer :B

Discussion

50.	As per sommerfeld 's extension which of these is correct ?
Answer» orbits of all electrons in an atom are elliptical NUCLEUS is present in the geometric center of the ellipse `V_(transverse)=n_(phi).(H)/(2pi)` where `n_(phi) ne 0, n_(phi) in +I` The fourth shellhas only circular orbits Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Aspirin and Analgin are ____ drugs.

Aspirin, an antipyretic drug is chemically :

Aspirin acts as an analgesic because it

Aspirin act as

Aspiriin can be prepared by the reaction of:-

Asphalt used for construction of roads is .........

Aspartame, the artificial sweetener is made of a dipeptide of the amino acids,

Aspartame is used as ………..

Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening ?

Aspartame is less preferred than sucralose as sweetner. Why?

Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening?

Asparmatge, an artificial sweetener is a peptide and has the following structure. Which of the following is correct about the molecule ?

[A]:Sometimes rate of reactio does not depend on concentration. [R]:The order of reaction can be negative.

A(s)hArrH_(2)S(g)+B(g) At eq., pressure = 18 atm C(s)hArrH_(2)S(g)+D(g) At eq., pressure = 36 atm Calculation mole fraction of B in the mixture.

AsF_(5) molecule is trigonal bipyramidal. The orbitals of As atom involved in hybridisation are

Asforption is accompained by

Ascorbic acid resembles the structure of

Ascorbic acid is a chemical name of:

Ascorbic acid is a……..

Ascorbic acid is a/an :

Ascorbic acid is a

Ascorbic acid is a……….. .

Ascorbic acid belongs to which vitamin ?

Ascorbic acid is:

Asbestos is chemically :

As_2S_3 sol is negatively charged. Between sodium nitrate and aluminium nitrate which one is needed in large quantity to coagulate the above sol ?

As_(2)S_(3) sol is

As_2S_3 sol has a negative charge. Capacity to precipitate it is highest in:

As_2S_3 is the example of

As_(2)S_(3) is solutionin(NH_(4))_(2)S_(2) (yellow ammonium sulphide) due to theformation of (a) _____.

As_2S_3is solublein yellowammonium sulphide due to the formation of :

As_(2)S_(3) is

As_(2)S_(3) and TiO_(2) sol are examples of

As_(2)O_(5) is ............while Sb_(2)O_(5) is.................. .

As_2 S_3is ____shaped colloid.

As we shall soon see, sidium amide (NaNH_(2)) is useful, especially when a reaction requires a very strong base. Explain why a solvent such as methanol cannnot be used to carry out a reaction in which you might want to use sodium amide as a base.

As we proceed from La(OH)_3 to Lu(OH)_3 basic strength increases / decreases.

As the temperature increases, the pH of a KOH solution

As the speed of molecules increase, the number of collisions per second :

As the size of gold particle increases the colour of solution varies as

As the s-character of hybridisation orbital increase, the bond angle

As the oxidation state for any metal increases,the tendency to show ionic nature:

As the number of carbon atoms in a chain increases the boiling point of alkanes

As the molecular weight increases the tensile strength of polymers

As the atomic number of the halogens increases, the halogens:

As the atomic number of the halogens increases, the halogens :

As Rhombic sulphur is heated in a test tube : {:(,"Process","Temperature"),((a),"Viscosity increases",T_(1)),((b),"Visconsity decrease",T_(2)),((c),"Paramagnetic molecules",T_(3)),((d),"Breakage of "S_(8) "rings",T_(4)),(,("Diradical formation in molten phase"),):} Correct order of temperature is

As temperature increases, vapour pressure of a liquid

As percentage of carbon increases in iron, its hardness,

As per sommerfeld 's extension which of these is correct ?