46295 + Interview Questions in Chemistry

1.	Consider the following redox reaction: NaBrO3+6H++6e−→NaBr+3H2O Calculate the weight of sodium bromate (NaBrO3) required to prepare 0.6 N of 100 mL solution. (Given : Molar mass of NaBrO3=151 g mol−1)
Answer» Consider the following redox reaction: $N a B r O_{3} + 6 H^{+} + 6 e^{-} \to N a B r + 3 H_{2} O$ Calculate the weight of sodium bromate $(N a B r O_{3})$ required to prepare $0.6 N$ of $100 m L$ solution. (Given : Molar mass of $N a B r O_{3} = 151 g m o l^{- 1}$ )

Discussion

2.	whuh type is responsibel for depletion of ozone layer in jet aeropanes No or NO2 or all niteogwn oxide
Answer» whuh type is responsibel for depletion of ozone layer in jet aeropanes No or NO2 or all niteogwn oxide

Discussion

3.	Nylon yarns are usually
Answer» Nylon yarns are usually

Discussion

4.	Mg(s)\|Mg2+(0.1)\|\|Ag+(1×10−3)\|AgE∘Ag+/Ag=+0.8volt,E∘Mg2+/Mg=−2.37 voltCalculate the emf of the cell (Round up the answer to two decimal places)(RTF=0.0591 V)
Answer» $M g (s) \| M g^{2 +} (0.1) \| \| A g^{+} (1 \times 10^{- 3}) \| A g$ $E_{A g^{+} / A g}^{\circ} = + 0.8 volt, E_{M g^{2 +} / M g}^{\circ} = - 2.37 volt$ Calculate the emf of the cell (Round up the answer to two decimal places) ( $\frac{R T}{F} = 0.0591 V$ )

Discussion

5.	Discuss the patternof variation in the oxidation states of(i) B to Tl and (ii) C to Pb.
Answer» Discuss the pattern of variation in the oxidation states of (i) B to Tl and (ii) C to Pb.

5.

Discuss the patternof variation in the oxidation states of(i) B to Tl and (ii) C to Pb.

Answer»

Discuss the pattern
of variation in the oxidation states of

(i) B to Tl and (ii) C to Pb.

Discussion

6.	The entropy change can be calculated by using the expression ΔS=qrevT. When water freezes in a glass beaker, choose the correct statement amongst the following. (a)ΔS (system) decreases but Δ S (surroundings) remains the same (b) ΔS (system) increases but ΔS (surroundings) decreases (c) ΔS (system) decreases but ΔS (surroundings) increases (d) ΔS (system) decreases but ΔS (surroundings) also decreases
Answer» The entropy change can be calculated by using the expression $Δ S = \frac{q_{r e v}}{T}$ . When water freezes in a glass beaker, choose the correct statement amongst the following. (a) $Δ$ S (system) decreases but $Δ$ S (surroundings) remains the same (b) $Δ$ S (system) increases but $Δ$ S (surroundings) decreases (c) $Δ$ S (system) decreases but $Δ$ S (surroundings) increases (d) $Δ$ S (system) decreases but $Δ$ S (surroundings) also decreases

Discussion

7.	Which of the following behaves as an ambiphilic reagent?
Answer» Which of the following behaves as an ambiphilic reagent?

Discussion

8.	How to factorose x2-3x+1
Answer» How to factorose x2-3x+1

Discussion

9.	Strongest acid is
Answer» Strongest acid is

9.

Strongest acid is

Answer»

Strongest acid is

Discussion

10.	For a general reaction aA(g) + bB(g) ⇋ cC(g)+ dD(g), what is the relationship between the equilibrium constants Kc and Kp? [assume Δn = μ = (c + d) - (a+b) ]\)
Answer» For a general reaction aA(g) + bB(g) $⇋$ cC(g)+ dD(g), what is the relationship between the equilibrium constants $K_{c}$ and $K_{p}$ ? [assume $Δ$ n = $μ$ = (c + d) - (a+b) ]\)

Discussion

11.	Draw all possible functional isomers of C2H4O.
Answer» Draw all possible functional isomers of C2H4O.

Discussion

12.	10g of Zn reacts with 2g of hcl according to the equation.zn+hcl=Zncl2+h2.Identify the limiting rwagent.Find the amt of product forme
Answer» 10g of Zn reacts with 2g of hcl according to the equation.zn+hcl=Zncl2+h2.Identify the limiting rwagent.Find the amt of product forme

Discussion

13.	The elements present in the core of earth are collectively known as
Answer» The elements present in the core of earth are collectively known as

Discussion

14.	a reaction A+B--> C+D +q is found to have a positive entropy change.the reaction will possible at high,low,any,not any temperature??
Answer» a reaction A+B--> C+D +q is found to have a positive entropy change.the reaction will possible at high,low,any,not any temperature??

Discussion

15.	Number of methyl substitutions takes place in the ring when aniline is reacted with CH3Cl in the presence of AlCl3?
Answer» Number of methyl substitutions takes place in the ring when aniline is reacted with $C H_{3} C l$ in the presence of $A l C l_{3}$ ?

Discussion

16.	Consider the reaction given below, the products ‘X’ and ‘Y’ respectively are:
Answer» Consider the reaction given below, the products ‘X’ and ‘Y’ respectively are:

Discussion

17.	Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?
Answer» Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?

17.

Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?

Answer»

Answer the following
questions:

(a) Long
distance radio broadcasts use short-wave bands. Why?

(b) It is
necessary to use satellites for long distance TV transmission. Why?

(c) Optical and radio telescopes are built on the ground but
X-ray astronomy is possible only from satellites orbiting the earth.
Why?

(d) The small ozone layer on top of the stratosphere is
crucial for human survival. Why?

(e) If the earth did not have an atmosphere, would its
average surface temperature be higher or lower than what it is now?

(f) Some scientists have predicted that a global nuclear war
on the earth would be followed by a severe ‘nuclear winter’
with a devastating effect on life on earth. What might be the basis
of this prediction?

Discussion

18.	AMINES: Why in case of alkyl amines reaction with NaNO2 HCl gives - OH instead of NH2 but in case of aryl amines we get N2+Cl-?
Answer» AMINES: Why in case of alkyl amines reaction with NaNO2 HCl gives - OH instead of NH2 but in case of aryl amines we get N2+Cl-?

Discussion

19.	Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.
Answer» Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.

Discussion

20.	0.1 mole of CH3NH2(Kb=5×10−4) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H+ concentration in the solution? log 5 =0.6989log 2= 0.301010−10.09=8.128×10−11
Answer» 0.1 mole of $C H_{3} N H_{2} (K_{b} = 5 \times 10^{- 4})$ is mixed with 0.08 mole of HCl and diluted to one litre. What will be the $H^{+}$ concentration in the solution? log 5 =0.6989 log 2= 0.3010 $10^{- 10.09} = 8.128 \times 10^{- 11}$

Discussion

21.	Calculate the percentage degree of dissociation of an electrolyte XY2 in water Normal molar mass=164 g/mol, if the observed molar mass by measuring elevation in boiling point is 65.6 g/mol
Answer» Calculate the percentage degree of dissociation of an electrolyte $X Y_{2}$ in water $Normal molar mass = 164 g / m o l$ , if the observed molar mass by measuring elevation in boiling point is $65.6 g / m o l$

Discussion

22.	Percentage of weight by volume of 0.6 M AgNO3(aq) (molar mass of AgNO3 = 170 g/mol) is
Answer» Percentage of weight by volume of 0.6 M AgNO3(aq) (molar mass of AgNO3 = 170 g/mol) is

Discussion

23.	The degree of dissociation of Ca(NO3)2 in a dilute aqueous solution containing 7 g of salt in 100 g of water at 100∘C is 70%. The vapour pressure of solution is:
Answer» The degree of dissociation of $C a (N O_{3})_{2}$ in a dilute aqueous solution containing 7 g of salt in 100 g of water at $100^{\circ} C$ is $70 %$ . The vapour pressure of solution is:

Discussion

24.	22.C_8H_{18} compound find (1) chain isomers (2) ring isomers
Answer» 22.C_8H_{18} compound find (1) chain isomers (2) ring isomers

Discussion

25.	ChlorobenzeneNaNH2−−−−−→liq. NH3(A)NaNO2/HCl−−−−−−−−→0−5 oC(B) (B)i. SnCl2/HCl−−−−−−−−→ii. dil. NaOH(C) Identify C in the above reaction:
Answer» $Chlorobenzene N a N H_{2} - ---- \to liq. N H_{3} (A) N a N O_{2} / H C l - ------- \to 0 - 5^{o} C (B)$ $(B) i . S n C l_{2} / H C l - ------- \to i i . d i l . N a O H (C)$ Identify $C$ in the above reaction:

Discussion

26.	Therate constant for the decomposition of hydrocarbons is 2.418 ×10−5s−1at 546 K. If the energy of activation is 179.9 kJ/mol, what will bethe value of pre-exponential factor.
Answer» The rate constant for the decomposition of hydrocarbons is 2.418 × 10⁻⁵s⁻¹ at 546 K. If the energy of activation is 179.9 kJ/mol, what will be the value of pre-exponential factor.

Discussion

27.	49. Does the volume of final solution be the same as the sum of volumes of acid and base previously added?
Answer» 49. Does the volume of final solution be the same as the sum of volumes of acid and base previously added?

Discussion

28.	NaOH + Ca(OH)2 complete the reaction plz give product and balance reaction
Answer» NaOH + Ca(OH)2 complete the reaction plz give product and balance reaction

Discussion

29.	The number of π electrons present in the benzene ring are
Answer» The number of $π$ electrons present in the benzene ring are

Discussion

30.	BF3 is Lewis acid and NH3 is Lewis base. If they combine, the hybrid state of B and N atom in adduct is(1) N is sp3, tetrahedral, B is sp3 tetrahedral(2) N is sp2, planar, B is sp3 tetrahedral(3) N is sp3, tetrahedral, B is sp2 planar(4) N is sp2, pyramidal, B is sp3 tetrahedral
Answer» BF3 is Lewis acid and NH3 is Lewis base. If they combine, the hybrid state of B and N atom in adduct is (1) N is sp3, tetrahedral, B is sp3 tetrahedral (2) N is sp2, planar, B is sp3 tetrahedral (3) N is sp3, tetrahedral, B is sp2 planar (4) N is sp2, pyramidal, B is sp3 tetrahedral

Discussion

31.	The strongest conjugate base is: (correct answer +1, wrong answer -0.25)
Answer» The strongest conjugate base is: (correct answer +1, wrong answer -0.25)

Discussion

32.	Equal volume of5.85%(w/v)NaCl and 17.55%(w/v) NaCl solutions are mixed if volume of mixture is 2.5 L then of moles of Na^+ present in the mixture is
Answer» Equal volume of5.85%(w/v)NaCl and 17.55%(w/v) NaCl solutions are mixed if volume of mixture is 2.5 L then of moles of Na^+ present in the mixture is

Discussion

33.	21. Calculate the molarity of one kg of electrons in 500ml of solution
Answer» 21. Calculate the molarity of one kg of electrons in 500ml of solution

Discussion

34.	Select the basic strength order of following molecules.(I)(II)(III)
Answer» Select the basic strength order of following molecules. (I) (II)(III)

Discussion

35.	How much KCl is formed by complete decompose of 10g of KClO3?
Answer» How much KCl is formed by complete decompose of 10g of KClO3?

Discussion

36.	An excess of potassium ions makes KCL crystals appear violet or lilac colour since ................ (a) some of the anionic sites are occupied by an unpaired electron (b) some of the anionic sites are occupied by a pair of electrons (c) there are vacancies at some anionic sites (d) F-centres are created which impart colors to the crystals
Answer» An excess of potassium ions makes KCL crystals appear violet or lilac colour since ................ (a) some of the anionic sites are occupied by an unpaired electron (b) some of the anionic sites are occupied by a pair of electrons (c) there are vacancies at some anionic sites (d) F-centres are created which impart colors to the crystals

36.

An excess of potassium ions makes KCL crystals appear violet or lilac colour since ................ (a) some of the anionic sites are occupied by an unpaired electron (b) some of the anionic sites are occupied by a pair of electrons (c) there are vacancies at some anionic sites (d) F-centres are created which impart colors to the crystals

Answer»

An excess of potassium ions makes KCL crystals appear violet or lilac colour since ................

(a) some of the anionic sites are occupied by an unpaired electron

(b) some of the anionic sites are occupied by a pair of electrons

(c) there are vacancies at some anionic sites

(d) F-centres are created which impart colors to the crystals

Discussion

37.	Ethylene dibromide and 1,2 dibromopropane forms a series of Ideal solutions over the whole range of composition. At 85 degree Celsius the vapour pressures of these two liquids are 173 and 127 torr respectively. What would be the mole fraction of Ethylene dibromide in a solution at 85 degree Celsius equilibrate with 1:1 molar mixture in the vapour.
Answer» Ethylene dibromide and 1,2 dibromopropane forms a series of Ideal solutions over the whole range of composition. At 85 degree Celsius the vapour pressures of these two liquids are 173 and 127 torr respectively. What would be the mole fraction of Ethylene dibromide in a solution at 85 degree Celsius equilibrate with 1:1 molar mixture in the vapour.

Discussion

38.	Q 4/15 The strength of 30 volume of hydrogenperoxide is
Answer» Q 4/15 The strength of 30 volume of hydrogenperoxide is

Discussion

39.	The shortest wavelength of transition in paschen series of He+ ion in nanometer (nm) isXRH nm, then X is
Answer» The shortest wavelength of transition in paschen series of $H e^{+}$ ion in nanometer (nm) is $\frac{X}{R_{H}}$ nm, then $X$ is

Discussion

40.	Optically pure 3 methyl hexane is treated with cl2/hv to form monochloro isomers. The product mixture is subjected to fractional distillation. How many number of optically active fractions are obtained? Draw their structures.
Answer» Optically pure 3 methyl hexane is treated with cl2/hv to form monochloro isomers. The product mixture is subjected to fractional distillation. How many number of optically active fractions are obtained? Draw their structures.

Discussion

41.	The name of the product obtained by the addition of HI to propene in presence of peroxide catalyst is
Answer» The name of the product obtained by the addition of HI to propene in presence of peroxide catalyst is

Discussion

42.	'और कविताएँ पढ़ते रहने से....आम बौर आवेंगे'- में निहित व्यंग्य को स्पष्ट कीजिए।
Answer» 'और कविताएँ पढ़ते रहने से....आम बौर आवेंगे'- में निहित व्यंग्य को स्पष्ट कीजिए।

Discussion

43.	1.propene on reaction with HCL in presence of peroxide gives.2.also in place of HCL if HI is substituted what is the product formed3.does hcl and hi react the same as hbr reacts with propene is absence of peroxide4.does hf give product with propene in presence and absence of peroxide
Answer» 1.propene on reaction with HCL in presence of peroxide gives. 2.also in place of HCL if HI is substituted what is the product formed 3.does hcl and hi react the same as hbr reacts with propene is absence of peroxide 4.does hf give product with propene in presence and absence of peroxide

Discussion

44.	Q7) The number of stereoisomers possible for the following compound is {CH_3-CH=CH-CH(Br)-CH_2-CH_3
Answer» Q7) The number of stereoisomers possible for the following compound is {CH_3-CH=CH-CH(Br)-CH_2-CH_3

Discussion

45.	3-(4-chlorocyclohex-2-enyl) propanoic acid here in naming rule 11 has been applied here or not
Answer» 3-(4-chlorocyclohex-2-enyl) propanoic acid here in naming rule 11 has been applied here or not

Discussion

46.	Which of the following ore is best concentrated by froth - flotation process?
Answer» Which of the following ore is best concentrated by froth - flotation process?

Discussion

47.	total number of atoms in 44 g of Carbon dioxide is ?
Answer» total number of atoms in 44 g of Carbon dioxide is ?

Discussion

48.	The standard enthalpies of formation of Al2O3 and CaO are −1675 kJmol−1 and −635 kJ mol−1 respectively.For the reaction,3CaO+2Al→3Ca+Al2O3 the standard reaction enthalpy, ΔrH0=______kJ (Rounded off to the Nearest Integer).
Answer» The standard enthalpies of formation of $A l_{2} O_{3}$ and $C a O$ are $- 1675 k J m o l^{- 1}$ and $- 635 k J m o l^{- 1}$ respectively. For the reaction, $3 C a O + 2 A l \to 3 C a + A l_{2} O_{3}$ the standard reaction enthalpy, $Δ_{r} H^{0}$ =______kJ (Rounded off to the Nearest Integer).

Discussion

49.	Which of the following curve is in accordance with freundlich adsorption isotherm?
Answer» Which of the following curve is in accordance with freundlich adsorption isotherm?

Discussion

50.	What is conservative and non conservative force
Answer» What is conservative and non conservative force

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Consider the following redox reaction: NaBrO3+6H++6e−→NaBr+3H2O Calculate the weight of sodium bromate (NaBrO3) required to prepare 0.6 N of 100 mL solution. (Given : Molar mass of NaBrO3=151 g mol−1)

whuh type is responsibel for depletion of ozone layer in jet aeropanes No or NO2 or all niteogwn oxide

Nylon yarns are usually

Mg(s)|Mg2+(0.1)||Ag+(1×10−3)|AgE∘Ag+/Ag=+0.8volt,E∘Mg2+/Mg=−2.37 voltCalculate the emf of the cell (Round up the answer to two decimal places)(RTF=0.0591 V)

Discuss the patternof variation in the oxidation states of(i) B to Tl and (ii) C to Pb.

Which of the following behaves as an ambiphilic reagent?

How to factorose x2-3x+1

Strongest acid is

For a general reaction aA(g) + bB(g) ⇋ cC(g)+ dD(g), what is the relationship between the equilibrium constants Kc and Kp? [assume Δn = μ = (c + d) - (a+b) ]\)

Draw all possible functional isomers of C2H4O.

10g of Zn reacts with 2g of hcl according to the equation.zn+hcl=Zncl2+h2.Identify the limiting rwagent.Find the amt of product forme

The elements present in the core of earth are collectively known as

a reaction A+B--> C+D +q is found to have a positive entropy change.the reaction will possible at high,low,any,not any temperature??

Number of methyl substitutions takes place in the ring when aniline is reacted with CH3Cl in the presence of AlCl3?

Consider the reaction given below, the products ‘X’ and ‘Y’ respectively are:

AMINES: Why in case of alkyl amines reaction with NaNO2 HCl gives - OH instead of NH2 but in case of aryl amines we get N2+Cl-?

Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic polymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type.

0.1 mole of CH3NH2(Kb=5×10−4) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H+ concentration in the solution? log 5 =0.6989log 2= 0.301010−10.09=8.128×10−11

Calculate the percentage degree of dissociation of an electrolyte XY2 in water Normal molar mass=164 g/mol, if the observed molar mass by measuring elevation in boiling point is 65.6 g/mol

Percentage of weight by volume of 0.6 M AgNO3(aq) (molar mass of AgNO3 = 170 g/mol) is

The degree of dissociation of Ca(NO3)2 in a dilute aqueous solution containing 7 g of salt in 100 g of water at 100∘C is 70%. The vapour pressure of solution is:

22.C_8H_{18} compound find (1) chain isomers (2) ring isomers

ChlorobenzeneNaNH2−−−−−→liq. NH3(A)NaNO2/HCl−−−−−−−−→0−5 oC(B) (B)i. SnCl2/HCl−−−−−−−−→ii. dil. NaOH(C) Identify C in the above reaction:

Therate constant for the decomposition of hydrocarbons is 2.418 ×10−5s−1at 546 K. If the energy of activation is 179.9 kJ/mol, what will bethe value of pre-exponential factor.

49. Does the volume of final solution be the same as the sum of volumes of acid and base previously added?

NaOH + Ca(OH)2 complete the reaction plz give product and balance reaction

The number of π electrons present in the benzene ring are

BF3 is Lewis acid and NH3 is Lewis base. If they combine, the hybrid state of B and N atom in adduct is(1) N is sp3, tetrahedral, B is sp3 tetrahedral(2) N is sp2, planar, B is sp3 tetrahedral(3) N is sp3, tetrahedral, B is sp2 planar(4) N is sp2, pyramidal, B is sp3 tetrahedral

The strongest conjugate base is: (correct answer +1, wrong answer -0.25)

Equal volume of5.85%(w/v)NaCl and 17.55%(w/v) NaCl solutions are mixed if volume of mixture is 2.5 L then of moles of Na^+ present in the mixture is

21. Calculate the molarity of one kg of electrons in 500ml of solution

Select the basic strength order of following molecules.(I)(II)(III)

How much KCl is formed by complete decompose of 10g of KClO3?

Q 4/15 The strength of 30 volume of hydrogenperoxide is

The shortest wavelength of transition in paschen series of He+ ion in nanometer (nm) isXRH nm, then X is

Optically pure 3 methyl hexane is treated with cl2/hv to form monochloro isomers. The product mixture is subjected to fractional distillation. How many number of optically active fractions are obtained? Draw their structures.

The name of the product obtained by the addition of HI to propene in presence of peroxide catalyst is

'और कविताएँ पढ़ते रहने से....आम बौर आवेंगे'- में निहित व्यंग्य को स्पष्ट कीजिए।

1.propene on reaction with HCL in presence of peroxide gives.2.also in place of HCL if HI is substituted what is the product formed3.does hcl and hi react the same as hbr reacts with propene is absence of peroxide4.does hf give product with propene in presence and absence of peroxide

Q7) The number of stereoisomers possible for the following compound is {CH_3-CH=CH-CH(Br)-CH_2-CH_3

3-(4-chlorocyclohex-2-enyl) propanoic acid here in naming rule 11 has been applied here or not

Which of the following ore is best concentrated by froth - flotation process?

total number of atoms in 44 g of Carbon dioxide is ?

The standard enthalpies of formation of Al2O3 and CaO are −1675 kJmol−1 and −635 kJ mol−1 respectively.For the reaction,3CaO+2Al→3Ca+Al2O3 the standard reaction enthalpy, ΔrH0=______kJ (Rounded off to the Nearest Integer).

Which of the following curve is in accordance with freundlich adsorption isotherm?

What is conservative and non conservative force