46295 + Interview Questions in Chemistry

1.	A gas cylinder containing cooking gas can withstand a pressure 14.9 atmosphere. The pressure guage of the cylinder indicates 12 atmosphere at 27 ∘C. Due to a sudden fire in the building, the temperature starts rising. Find the temperature ( K) when the cylinder explodes?
Answer» A gas cylinder containing cooking gas can withstand a pressure 14.9 atmosphere. The pressure guage of the cylinder indicates 12 atmosphere at $27^{\circ} C$ . Due to a sudden fire in the building, the temperature starts rising. Find the temperature ( K) when the cylinder explodes?

Discussion

2.	The elements are classified into four blocks depending on:
Answer» The elements are classified into four blocks depending on:

Discussion

3.	41. Which one is more stable:- (CH3)3C+. PhCH2+
Answer» 41. Which one is more stable:- (CH3)3C+. PhCH2+

Discussion

4.	Among the hydrogens Ha,Hb,Hc and Hd in the given compound , which of the following has highest bond energy?
Answer» Among the hydrogens $H_{a}, H_{b}, H_{c} and H_{d}$ in the given compound , which of the following has highest bond energy?

Discussion

5.	DNA replication occurs in:
Answer» DNA replication occurs in:

Discussion

6.	how many chloro derivative of inorganic benzene are ther
Answer» how many chloro derivative of inorganic benzene are ther

Discussion

7.	A weak acid HA after treatment with 12 ml of 0.1 M strong base BOH has pH=5. At the end point, the volume of same base required is 13.2 ml. Ka of acid is:
Answer» A weak acid $H A$ after treatment with $12 ml$ of $0.1 M$ strong base $B O H$ has $p H = 5$ . At the end point, the volume of same base required is $13.2 ml$ . $K_{a}$ of acid is:

Discussion

8.	How the valency of cobalt, iron and nickel is same( 2,3)
Answer» How the valency of cobalt, iron and nickel is same( 2,3)

Discussion

9.	When photon of energy 4.25eV strikes the surface of metal A the ejected photoelectrons have a maximum kinetic energy,Ta and de broglie wavelength A. The maximum kinetic energy of photoelectrons liberated from another metalB by photon of energy 4.70 eV is Tb =Ta-1.50eV. If the de broglie wavelength of these photoelectrons is waveleght of B =2 wavelength of A then which is not correct (A) the work function of A is 2.25ev (B) the work function of B is 1.20 ev (C) Ta=2.00ev (D) Tb= 0.5 ev
Answer» When photon of energy 4.25eV strikes the surface of metal A the ejected photoelectrons have a maximum kinetic energy,Ta and de broglie wavelength A. The maximum kinetic energy of photoelectrons liberated from another metalB by photon of energy 4.70 eV is Tb =Ta-1.50eV. If the de broglie wavelength of these photoelectrons is waveleght of B =2 wavelength of A then which is not correct (A) the work function of A is 2.25ev (B) the work function of B is 1.20 ev (C) Ta=2.00ev (D) Tb= 0.5 ev

Discussion

10.	The correct increasing order of non-metallic character is:
Answer» The correct increasing order of non-metallic character is:

Discussion

11.	Which of the following is/are true in case of molecules?
Answer» Which of the following is/are true in case of molecules?

Discussion

12.	Calculatethe volume occupied by 8.8 g of CO2at 31.1°C and 1 bar pressure.R= 0.083 bar L K–1mol–1.
Answer» Calculate the volume occupied by 8.8 g of CO₂ at 31.1°C and 1 bar pressure. R = 0.083 bar L K^–1 mol^–1.

12.

Calculatethe volume occupied by 8.8 g of CO2at 31.1°C and 1 bar pressure.R= 0.083 bar L K–1mol–1.

Answer»

Calculate
the volume occupied by 8.8 g of CO₂
at 31.1°C and 1 bar pressure.

R
= 0.083 bar L K^–1
mol^–1.

Discussion

13.	0.4 g of an organic compound was treated according to Kjeldal's method. The ammonia evolved was absorbed in 50 mL of 0.5 M H3PO3. The residual acid required (30~mL\) of 0.5 M Ca(OH)2. What is the percentage of N2 in the compound?
Answer» $0.4 g$ of an organic compound was treated according to Kjeldal's method. The ammonia evolved was absorbed in $50 m L$ of $0.5 M H_{3} P O_{3}$ . The residual acid required (30~mL\) of $0.5 M C a (O H)_{2}$ . What is the percentage of $N_{2}$ in the compound?

Discussion

14.	10 drops of an oleic acid solution of concentration 1/400 cm cube per cm cube of alcohol, are dropped on a water surface. The circular film thus produce has a radius 10 cm. Find the molecular size of oleic acid , if the radius of each drop is 1.4mm
Answer» 10 drops of an oleic acid solution of concentration 1/400 cm cube per cm cube of alcohol, are dropped on a water surface. The circular film thus produce has a radius 10 cm. Find the molecular size of oleic acid , if the radius of each drop is 1.4mm

Discussion

15.	) Which of the following is the least volatile?(1) CH3-CH2 -CH2-F(2) CH3-CH2-CH2_-Cl(3) CH,-CH-CH,(4) CH3 -CH2-CH2 Br
Answer» ) Which of the following is the least volatile?(1) CH3-CH2 -CH2-F(2) CH3-CH2-CH2_-Cl(3) CH,-CH-CH,(4) CH3 -CH2-CH2 Br

Discussion

16.	The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]
Answer» The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]

Discussion

17.	In which one of the following keto-enol system is the keto form more stable than the enol form?
Answer» In which one of the following keto-enol system is the keto form more stable than the enol form?

Discussion

18.	a solution of weak monoprotic acid(0.1M) of Ka=10^{-5} is kept at 298K then what will be the pH of this solution?
Answer» a solution of weak monoprotic acid(0.1M) of Ka=10^{-5} is kept at 298K then what will be the pH of this solution?

Discussion

19.	15.The equilibrium constant Kp for the thermal dissociation of PCl5 at 200 degree celcius is 1.5 atm. The pressure in atm at which it is 50% dissociated at that temperature is A)4.8 B) 4.5 C)3.2 D)2.4
Answer» 15.The equilibrium constant Kp for the thermal dissociation of PCl5 at 200 degree celcius is 1.5 atm. The pressure in atm at which it is 50% dissociated at that temperature is A)4.8 B) 4.5 C)3.2 D)2.4

Discussion

20.	The compound which will dissolve in aqueous NaOH is para nitro phenol.why?
Answer» The compound which will dissolve in aqueous NaOH is para nitro phenol.why?

Discussion

21.	A metal crystallizes in fcc structure with a unit cell side of 500 pm. If the density of the crystal is 1.33 g/cc, the molar mass of the metal is close to?
Answer» A metal crystallizes in fcc structure with a unit cell side of $500 pm$ . If the density of the crystal is $1.33 g/cc$ , the molar mass of the metal is close to?

Discussion

22.	If we increase the temperature of ice from - 20 degree Celsius to 0 degree Celsius, does the ice melt?
Answer» If we increase the temperature of ice from - 20 degree Celsius to 0 degree Celsius, does the ice melt?

Discussion

23.	52. Balance in acidic medium. H2S + Fe -> Fe + S
Answer» 52. Balance in acidic medium. H2S + Fe -> Fe + S

Discussion

24.	38. Ionisation energy is the energy required to remove the valence electron from its shell to get converted to a cation. Then, while formation of ionic bond, why the ionisation energy of metal should be low? Instead it should be high i think so?
Answer» 38. Ionisation energy is the energy required to remove the valence electron from its shell to get converted to a cation. Then, while formation of ionic bond, why the ionisation energy of metal should be low? Instead it should be high i think so?

Discussion

25.	3x +3x+1 =36
Answer» 3 x +3 x+1 =36

Discussion

26.	Whichalkyl halide from the following pairs would you expect to react morerapidly by an SN2mechanism? Explain your answer.(i) (ii) (iii)
Answer» Which alkyl halide from the following pairs would you expect to react more rapidly by an S_N2 mechanism? Explain your answer. (i) (ii) (iii)

26.

Whichalkyl halide from the following pairs would you expect to react morerapidly by an SN2mechanism? Explain your answer.(i) (ii) (iii)

Answer»

Which
alkyl halide from the following pairs would you expect to react more
rapidly by an S_N2
mechanism? Explain your answer.

(i)

(ii)

(iii)

Discussion

27.	The value of PV for 5.6 litres of an ideal gas at NTP is
Answer» The value of $P V$ for 5.6 litres of an ideal gas at $NTP$ is

Discussion

28.	Calculate the volume at STP of 320 ml of gas collected over water at 760 mm pressure and 380 Ktemperature. Vapour pressure of water at 380 K is 48 mm
Answer» Calculate the volume at STP of 320 ml of gas collected over water at 760 mm pressure and 380 K temperature. Vapour pressure of water at 380 K is 48 mm

Discussion

29.	How many oxygen atoms are present in one molecule of an artificial sweetener which is about 550 time sweeter than table sugar and it contains sulphur, nitrogen and one benzene ring also?
Answer» How many oxygen atoms are present in one molecule of an artificial sweetener which is about 550 time sweeter than table sugar and it contains sulphur, nitrogen and one benzene ring also?

Discussion

30.	why group 1 element have low melting point and boiling point even though they are metals ?
Answer» why group 1 element have low melting point and boiling point even though they are metals ?

Discussion

31.	8. What will be the order of reactivity of following towards HCN; formaldehyde Propionaldehyde Acetone Ethyl methyl ketone
Answer» 8. What will be the order of reactivity of following towards HCN; formaldehyde Propionaldehyde Acetone Ethyl methyl ketone

Discussion

32.	21.How do atoms combine in metals?
Answer» 21.How do atoms combine in metals?

Discussion

33.	20-10. Mole fraction of solvent in aqueous solution ofNaOH having molality of 3 is(2) 0.050.95(3) 0.7
Answer» 20-10. Mole fraction of solvent in aqueous solution ofNaOH having molality of 3 is(2) 0.050.95(3) 0.7

Discussion

34.	28. 1 mole of Mno4- will oxidise x moles of ferric oxalate in acidic medium. What is the value of x?
Answer» 28. 1 mole of Mno4- will oxidise x moles of ferric oxalate in acidic medium. What is the value of x?

Discussion

35.	The correct structures of trans -[NiBr2(PPh3)2] and meridional -[Co(NH3)3(NO2)3] respectively are:
Answer» The correct structures of $trans - [N i B r_{2} (P P h_{3})_{2}]$ and $meridional - [C o (N H_{3})_{3} (N O_{2})_{3}]$ respectively are:

Discussion

36.	Which state of triply ionised beryllium (Be3+)has the same orbital radius as that of the ground state of H-atom ?
Answer» Which state of triply ionised beryllium (Be3+)has the same orbital radius as that of the ground state of H-atom ?

Discussion

37.	Tap on the bubbles which give 5 as the answer.
Answer» Tap on the bubbles which give 5 as the answer.

Discussion

38.	An organic compound (CxH2yOy) was burnt with twice the amount of oxygen needed for complete combustion to CO2 and H2O. The hot gases when cooled to 0∘C and 1 atm pressure, measured 2.24 L. The water collected during cooling weighed 0.9 g. The vapour pressure of pure water at 20∘C is 17.5 mm Hg and is lowered by 0.104 mm Hg when 50 g of the organic compound is dissolved in 1000 g of water. Give the molecular formula of the organic compound.
Answer» An organic compound $(C_{x} H_{2 y} O_{y})$ was burnt with twice the amount of oxygen needed for complete combustion to $C O_{2}$ and $H_{2} O$ . The hot gases when cooled to $0^{\circ} C$ and $1 a t m$ pressure, measured $2.24 L$ . The water collected during cooling weighed $0.9 g$ . The vapour pressure of pure water at $20^{\circ} C$ is $17.5 m m H g$ and is lowered by $0.104 m m H g$ when $50 g$ of the organic compound is dissolved in $1000 g$ of water. Give the molecular formula of the organic compound.

Discussion

39.	What do you mean by the the specific heat capacity of copper is 0.4J g−1K−1?
Answer» What do you mean by the the specific heat capacity of copper is 0.4J $g^{- 1} K^{- 1}$ ?

Discussion

40.	The IUPAC name of the following compound is?CH3−CH2−CH2−C\|HCH3−CH2−CH3\|CH−CH3
Answer» The IUPAC name of the following compound is? $C H_{3} - C H_{2} - C H_{2} - C \| H C H_{3} - C H_{2} - C H_{3} \| C H - C H_{3}$

40.

The IUPAC name of the following compound is?CH3−CH2−CH2−C|HCH3−CH2−CH3|CH−CH3

Answer»

The IUPAC name of the following compound is?

$C H_{3} - C H_{2} - C H_{2} - C | H C H_{3} - C H_{2} - C H_{3} | C H - C H_{3}$

Discussion

41.	The reaction C6H5CHO+ CH3CHO→ C6H5CH= CH-CHO is known as (a) Perkin's reaction (b) Claisen condensation (c) Benzoin condensation (dCannizzaro's reaction
Answer» The reaction C6H5CHO+ CH3CHO→ C6H5CH= CH-CHO is known as (a) Perkin's reaction (b) Claisen condensation (c) Benzoin condensation (dCannizzaro's reaction

Discussion

42.	The density of a gas at 27∘C and 1 atm is ‘d’. At what temperature would it density be 0.75d, if the pressure is kept constant?
Answer» The density of a gas at $27^{\circ} C$ and 1 atm is ‘d’. At what temperature would it density be 0.75d, if the pressure is kept constant?

Discussion

43.	Reaction for which enthalpy of reaction is equal to standard enthalpy of formation:
Answer» Reaction for which enthalpy of reaction is equal to standard enthalpy of formation:

Discussion

44.	In a typical combustion engine, the work done by a gas molecule is given byW=α2βe-βx2kTwhere x is the displacement, k is the Boltzmann constant and T is the temperature. If α and β are constants, dimensions of α will be
Answer» In a typical combustion engine, the work done by a gas molecule is given by $W = α^{2} β e^{\frac{- β x^{2}}{k T}}$ where $x$ is the displacement, $k$ is the Boltzmann constant and $T$ is the temperature. If $α$ and $β$ are constants, dimensions of $α$ will be

44.

In a typical combustion engine, the work done by a gas molecule is given byW=α2βe-βx2kTwhere x is the displacement, k is the Boltzmann constant and T is the temperature. If α and β are constants, dimensions of α will be

Answer»

In a typical combustion engine, the work done by a gas molecule is given by

$W = α^{2} β e^{\frac{- β x^{2}}{k T}}$

where $x$ is the displacement, $k$ is the Boltzmann constant and $T$ is the temperature. If $α$ and $β$ are constants, dimensions of $α$ will be

Discussion

45.	How many faradays of charge are required to reduce one mole of Cr2O7-2 to Cr+3?
Answer» How many faradays of charge are required to reduce one mole of Cr2O7-2 to Cr+3?

Discussion

46.	If the size of a nucleus {10 raised to the power -15} is scaled up to the tip of the sharp pin {10 raised to the power -5} then what roughly is the size of the atom ?
Answer» If the size of a nucleus {10 raised to the power -15} is scaled up to the tip of the sharp pin {10 raised to the power -5} then what roughly is the size of the atom ?

Discussion

47.	In the oil drop experimant, charge on electron came out to be −1.6×10−19 C. From Thomson's experiment, e/m value for electron calculated was 1.758820×1011 C/kg. Find the mass of the electron.(Given: e is the magnitude of charge on electron)
Answer» In the oil drop experimant, charge on electron came out to be $- 1.6 \times 10^{- 19} C$ . From Thomson's experiment, $e / m$ value for electron calculated was $1.758820 \times 10^{11} C/kg$ . Find the mass of the electron. (Given: $e$ is the magnitude of charge on electron)

Discussion

48.	A charge particle of charge +q, mass m moving with a velocity ui enters a uniform electric field strength E=Ej. Find magnitude of velocity and displacement at time t.
Answer» A charge particle of charge +q, mass m moving with a velocity ui enters a uniform electric field strength E=Ej. Find magnitude of velocity and displacement at time t.

Discussion

49.	Uncertainity of the given resistance is
Answer» Uncertainity of the given resistance is

Discussion

50.	Which of the following is not an aryl halide?
Answer» Which of the following is not an aryl halide?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A gas cylinder containing cooking gas can withstand a pressure 14.9 atmosphere. The pressure guage of the cylinder indicates 12 atmosphere at 27 ∘C. Due to a sudden fire in the building, the temperature starts rising. Find the temperature ( K) when the cylinder explodes?

The elements are classified into four blocks depending on:

41. Which one is more stable:- (CH3)3C+. PhCH2+

Among the hydrogens Ha,Hb,Hc and Hd in the given compound , which of the following has highest bond energy?

DNA replication occurs in:

how many chloro derivative of inorganic benzene are ther

A weak acid HA after treatment with 12 ml of 0.1 M strong base BOH has pH=5. At the end point, the volume of same base required is 13.2 ml. Ka of acid is:

How the valency of cobalt, iron and nickel is same( 2,3)

The correct increasing order of non-metallic character is:

Which of the following is/are true in case of molecules?

Calculatethe volume occupied by 8.8 g of CO2at 31.1°C and 1 bar pressure.R= 0.083 bar L K–1mol–1.

0.4 g of an organic compound was treated according to Kjeldal's method. The ammonia evolved was absorbed in 50 mL of 0.5 M H3PO3. The residual acid required (30~mL\) of 0.5 M Ca(OH)2. What is the percentage of N2 in the compound?

10 drops of an oleic acid solution of concentration 1/400 cm cube per cm cube of alcohol, are dropped on a water surface. The circular film thus produce has a radius 10 cm. Find the molecular size of oleic acid , if the radius of each drop is 1.4mm

) Which of the following is the least volatile?(1) CH3-CH2 -CH2-F(2) CH3-CH2-CH2_-Cl(3) CH,-CH-CH,(4) CH3 -CH2-CH2 Br

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration? [NEET 2017]

In which one of the following keto-enol system is the keto form more stable than the enol form?

a solution of weak monoprotic acid(0.1M) of Ka=10^{-5} is kept at 298K then what will be the pH of this solution?

15.The equilibrium constant Kp for the thermal dissociation of PCl5 at 200 degree celcius is 1.5 atm. The pressure in atm at which it is 50% dissociated at that temperature is A)4.8 B) 4.5 C)3.2 D)2.4

The compound which will dissolve in aqueous NaOH is para nitro phenol.why?

A metal crystallizes in fcc structure with a unit cell side of 500 pm. If the density of the crystal is 1.33 g/cc, the molar mass of the metal is close to?

If we increase the temperature of ice from - 20 degree Celsius to 0 degree Celsius, does the ice melt?

52. Balance in acidic medium. H2S + Fe -> Fe + S

38. Ionisation energy is the energy required to remove the valence electron from its shell to get converted to a cation. Then, while formation of ionic bond, why the ionisation energy of metal should be low? Instead it should be high i think so?

3​x​​ +3​x+1​​ =36

Whichalkyl halide from the following pairs would you expect to react morerapidly by an SN2mechanism? Explain your answer.(i) (ii) (iii)

The value of PV for 5.6 litres of an ideal gas at NTP is

Calculate the volume at STP of 320 ml of gas collected over water at 760 mm pressure and 380 Ktemperature. Vapour pressure of water at 380 K is 48 mm

How many oxygen atoms are present in one molecule of an artificial sweetener which is about 550 time sweeter than table sugar and it contains sulphur, nitrogen and one benzene ring also?

why group 1 element have low melting point and boiling point even though they are metals ?

8. What will be the order of reactivity of following towards HCN; formaldehyde Propionaldehyde Acetone Ethyl methyl ketone

21.How do atoms combine in metals?

20-10. Mole fraction of solvent in aqueous solution ofNaOH having molality of 3 is(2) 0.050.95(3) 0.7

28. 1 mole of Mno4- will oxidise x moles of ferric oxalate in acidic medium. What is the value of x?

The correct structures of trans -[NiBr2(PPh3)2] and meridional -[Co(NH3)3(NO2)3] respectively are:

Which state of triply ionised beryllium (Be​​​​​3+)has the same orbital radius as that of the ground state of H-atom ?

Tap on the bubbles which give 5 as the answer.

What do you mean by the the specific heat capacity of copper is 0.4J g−1K−1?

The IUPAC name of the following compound is?CH3−CH2−CH2−C|HCH3−CH2−CH3|CH−CH3

The reaction C6H5CHO+ CH3CHO→ C6H5CH= CH-CHO is known as (a) Perkin's reaction (b) Claisen condensation (c) Benzoin condensation (dCannizzaro's reaction

The density of a gas at 27∘C and 1 atm is ‘d’. At what temperature would it density be 0.75d, if the pressure is kept constant?

Reaction for which enthalpy of reaction is equal to standard enthalpy of formation:

In a typical combustion engine, the work done by a gas molecule is given byW=α2βe-βx2kTwhere x is the displacement, k is the Boltzmann constant and T is the temperature. If α and β are constants, dimensions of α will be

How many faradays of charge are required to reduce one mole of Cr2O7-2 to Cr+3?

If the size of a nucleus {10 raised to the power -15} is scaled up to the tip of the sharp pin {10 raised to the power -5} then what roughly is the size of the atom ?

In the oil drop experimant, charge on electron came out to be −1.6×10−19 C. From Thomson's experiment, e/m value for electron calculated was 1.758820×1011 C/kg. Find the mass of the electron.(Given: e is the magnitude of charge on electron)

A charge particle of charge +q, mass m moving with a velocity ui enters a uniform electric field strength E=Ej. Find magnitude of velocity and displacement at time t.

Uncertainity of the given resistance is

Which of the following is not an aryl halide?

3x +3x+1 =36

Which state of triply ionised beryllium (Be3+)has the same orbital radius as that of the ground state of H-atom ?