46295 + Interview Questions in Chemistry

1.	The bond formed by a shared pair of electrons, with both electrons coming from the same atom, is known as :
Answer» The bond formed by a shared pair of electrons, with both electrons coming from the same atom, is known as :

Discussion

2.	Write down the maximum number of electrons that s, p and d-subshells can accomodate.
Answer» Write down the maximum number of electrons that s, p and d-subshells can accomodate.

Discussion

3.	Which statement regarding an orbital is FALSE?
Answer» Which statement regarding an orbital is FALSE?

Discussion

4.	A solution of caustic soda in water or when fused, conducts an electric current. What is the similarity in these two cases?
Answer» A solution of caustic soda in water or when fused, conducts an electric current. What is the similarity in these two cases?

Discussion

5.	How do you express the bond strength in terms of bond order?
Answer» How do you express the bond strength in terms of bond order?

Discussion

6.	F=f(z)dF/dZ=0 then F=max.why
Answer» F=f(z) dF/dZ=0 then F=max.why

Discussion

7.	The mass of 350cm^3 of a diatomic gas at 273K at 2atm is one gram. Calculate the mass of one atom of the gas?
Answer» The mass of 350cm^3 of a diatomic gas at 273K at 2atm is one gram. Calculate the mass of one atom of the gas?

Discussion

8.	66.Triple bondenergy order in decreasing order will be of co, N2 , cn , cc
Answer» 66.Triple bondenergy order in decreasing order will be of co, N2 , cn , cc

Discussion

9.	Which of the following is not a state function?
Answer» Which of the following is not a state function?

Discussion

10.	9. Which among the following contains highest number of atoms 1. 49g of H2SO4 2. 49g of H3PO4 3.16g of CH4 4. 64g of SO2
Answer» 9. Which among the following contains highest number of atoms 1. 49g of H2SO4 2. 49g of H3PO4 3.16g of CH4 4. 64g of SO2

Discussion

11.	The chlorate ion can disproportionate in basic solution according to reaction,2ClO−3⇌ClO−2+ClO−4The concentration of chlorate ion present initially is 0.1 M.The equilibrium concentration of perchlorate ions at 298 K is x. What is the value of 1x?Given : EClO−4\|ClO−3=0.36V and E∘ClO−3\|ClO−2=0.33.V At 298 KRTF=0.06 V√10=3.16
Answer» The chlorate ion can disproportionate in basic solution according to reaction, $2 C l O_{3}^{-} ⇌ C l O_{2}^{-} + C l O_{4}^{-}$ The concentration of chlorate ion present initially is $0.1 M$ . The equilibrium concentration of perchlorate ions at $298$ K is $x$ . What is the value of $\frac{1}{x}$ ? Given : $E_{C l O_{4}^{-} \| C l O_{3}^{-}} = 0.36 V a n d E_{C l O_{3}^{-} \| C l O_{2}^{-}}^{\circ} = 0.33. V A t 298 K \frac{R T}{F} = 0.06 V \sqrt{10} = 3.16$

Discussion

12.	deravation of temperature formulas1)celsius to farenheit2)farenheit to celsius3)celsius to kelvin
Answer» deravation of temperature formulas 1)celsius to farenheit 2)farenheit to celsius 3)celsius to kelvin

Discussion

13.	An explosion of atomic bomb release an energy of 7.6×1013 J. If 200 MeV energy is released in fission of one U235 atom, then the number of uranium atoms undergoing fission and the mass of uranium used in the tom bomb
Answer» An explosion of atomic bomb release an energy of $7.6 \times 10^{13} J$ . If $200 MeV$ energy is released in fission of one $U^{235}$ atom, then the number of uranium atoms undergoing fission and the mass of uranium used in the tom bomb

Discussion

14.	For the reaction MCO3(s)—MO(s)+CO2 (g) ∆H=82.8kj at 25°C ∆E or ∆U at 25°C is
Answer» For the reaction MCO3(s)—MO(s)+CO2 (g) ∆H=82.8kj at 25°C ∆E or ∆U at 25°C is

Discussion

15.	24.A neutron(mass 1.67\ast10^-27kg) moving at a speed of 1\ast10^8ms collides with a deutron (mass 3.34\ast10^-27kg)at rest and sticks to it find the speed of the composite particle triton
Answer» 24.A neutron(mass 1.67\ast10^-27kg) moving at a speed of 1\ast10^8ms collides with a deutron (mass 3.34\ast10^-27kg)at rest and sticks to it find the speed of the composite particle triton

Discussion

16.	A:p- hydroxybenzaldehyde shows higher boiling point than o-hydroxy benzaldehyde B: Maximum molecular weight of HF in vapour state is 120(atomic weight of H=1, F=19) C.p-hydroxybenzaldehyde can be purified by steam distillation due to inter molecular hydrogen bonding The correct statements are
Answer» A:p- hydroxybenzaldehyde shows higher boiling point than o-hydroxy benzaldehyde B: Maximum molecular weight of HF in vapour state is 120(atomic weight of H=1, F=19) C.p-hydroxybenzaldehyde can be purified by steam distillation due to inter molecular hydrogen bonding The correct statements are

Discussion

17.	A hydrocarbon of molecular formula C5H10 on monochlorination gives one product and on dichlorination gives three products (excluding stereo isomers). Identify the hydrocarbon.
Answer» A hydrocarbon of molecular formula C5H10 on monochlorination gives one product and on dichlorination gives three products (excluding stereo isomers). Identify the hydrocarbon.

Discussion

18.	what is the product when tertiary butyl benzene is oxidised bKMnO4?
Answer» what is the product when tertiary butyl benzene is oxidised b KMnO4?

Discussion

19.	The oxidation state of N in nitrogen sesquioxide is:
Answer» The oxidation state of $N$ in nitrogen sesquioxide is:

Discussion

20.	In which of the following elements +1 oxidation state is more stable than +3 oxidation state?
Answer» In which of the following elements +1 oxidation state is more stable than +3 oxidation state?

Discussion

21.	One mole of an ideal gas is taken from a to b along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work done along the solid line path is Ws and that along the dotted line path is Wd then the integer closest to the ratio WdWs is:___
Answer» One mole of an ideal gas is taken from a to b along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work done along the solid line path is $W_{s}$ and that along the dotted line path is $W_{d}$ then the integer closest to the ratio $\frac{W_{d}}{W_{s}}$ is:___

Discussion

22.	Which of the following metal does not react with the solution of copper sulphate [CPMT 1999]
Answer» Which of the following metal does not react with the solution of copper sulphate [CPMT 1999]

22.

Which of the following metal does not react with the solution of copper sulphate [CPMT 1999]

Answer»

Which of the following metal does not react with the solution of copper sulphate

[CPMT 1999]

Discussion

23.	A compound is made of A,B,C forming ccp lattice. A occupies all lattice points whereas B and C occupy alternate tetrahedral voids. If all atoms along the body diagonal are removed the formula of compound is
Answer» A compound is made of A,B,C forming ccp lattice. A occupies all lattice points whereas B and C occupy alternate tetrahedral voids. If all atoms along the body diagonal are removed the formula of compound is

Discussion

24.	What is the oxidation state of chlorine in calcium salt of Bleaching Powder Ca(OCl)2?
Answer» What is the oxidation state of chlorine in calcium salt of Bleaching Powder $C a (O C l)_{2}$ ?

Discussion

25.	How Tetraheddral void length ie r+ + r- is _/3a / 4
Answer» How Tetraheddral void length ie r+ + r- is _ /3a / 4

Discussion

26.	In an interference pattern the (n+4)th blue bright fringe and nth red bright fringe are formed at the same spot. If red and blue light have the wavelength of 7800 ˚A and 5200 ˚A then value of n should be:
Answer» In an interference pattern the $(n + 4)^{t h}$ blue bright fringe and $n^{t h}$ red bright fringe are formed at the same spot. If red and blue light have the wavelength of $7800 ˚ A$ and $5200 ˚ A$ then value of $n$ should be:

Discussion

27.	Number of probable product(s) of the above reaction is:
Answer» Number of probable product(s) of the above reaction is:

Discussion

28.	The total number of bonds in the elemental white phosphorous molecule is
Answer» The total number of bonds in the elemental white phosphorous molecule is

Discussion

29.	The osmotic pressure of a solution in atm obtained onmixing each 50 mL of 1.2% mass/vol. urea solution and24% mass/vol. glucose solution at 300 K(R -0.08 litre atm K^{-1} mol^-)
Answer» The osmotic pressure of a solution in atm obtained onmixing each 50 mL of 1.2% mass/vol. urea solution and24% mass/vol. glucose solution at 300 K(R -0.08 litre atm K^{-1} mol^-)

Discussion

30.	14.A solid conducting sphere having a charge Q is surrounded by an uncharged concentric spherical shell of copper.The potential difference between surface of this solid sphere and spherical shell is V. The shell is given a charge -3Q what is the new potential difference between them?
Answer» 14.A solid conducting sphere having a charge Q is surrounded by an uncharged concentric spherical shell of copper.The potential difference between surface of this solid sphere and spherical shell is V. The shell is given a charge -3Q what is the new potential difference between them?

Discussion

31.	The correct order of decreasing ionic radii among the following isoelectronic species is:
Answer» The correct order of decreasing ionic radii among the following isoelectronic species is:

Discussion

32.	Consider the following equilibrium constants for a triprotic acid H3PO4---First ionisation constant is k1.Second ions. const. is k2 and likewise third ionisation constant is k3.So, which of the following orders is correct ?k1>k3>k2k3>k2>k1k1>k2>k3 and what is the reason for this ?
Answer» Consider the following equilibrium constants for a triprotic acid H3PO4--- First ionisation constant is k1. Second ions. const. is k2 and likewise third ionisation constant is k3. So, which of the following orders is correct ? k1>k3>k2 k3>k2>k1 k1>k2>k3 and what is the reason for this ?

Discussion

33.	Which of the following does not contain a bond between two sulphur atoms?
Answer» Which of the following does not contain a bond between two sulphur atoms?

Discussion

34.	what are vector laws
Answer» what are vector laws

Discussion

35.	The electronic configuration 3p6,3d9 represents a
Answer» The electronic configuration $3 p^{6}, 3 d^{9}$ represents a

Discussion

36.	(a) What is rate of reaction? Write two factors that affect the rate of reaction. (b) The rate constant of a first order reaction increases from 4×10−2 to 8×10−2 when the temperature changes from 27∘C to 37∘C. Calculate the energy of activation (Ea). (log 2 =0.301, log 3 =0.4771, log 4 =0.6021)
Answer» (a) What is rate of reaction? Write two factors that affect the rate of reaction. (b) The rate constant of a first order reaction increases from $4 \times 10^{- 2}$ to $8 \times 10^{- 2}$ when the temperature changes from $27^{\circ} C$ to $37^{\circ} C$ . Calculate the energy of activation $(E_{a})$ . (log 2 =0.301, log 3 =0.4771, log 4 =0.6021)

Discussion

37.	In an atom, which has 2K,8L,18M and 2N electrons in the ground state .The total number of electrons having magnetic quantum number , m=0
Answer» In an atom, which has 2K,8L,18M and 2N electrons in the ground state .The total number of electrons having magnetic quantum number , m=0

Discussion

38.	Diazonium cation attack at C or N- atom of aniline ?explain this.
Answer» Diazonium cation attack at C or N- atom of aniline ?explain this.

Discussion

39.	why does thermal stability of oxides, hydroxides etc of 2nd group elements increases down the group ?? and shouldn't it decrease down the group as the size of atom is increasing ??
Answer» why does thermal stability of oxides, hydroxides etc of 2nd group elements increases down the group ?? and shouldn't it decrease down the group as the size of atom is increasing ??

Discussion

40.	Which of the following species does not use dz2 orbitals in hybridisation?
Answer» Which of the following species does not use $d_{z^{2}}$ orbitals in hybridisation?

Discussion

41.	38. Most stable carbocation is? 1) CH2+ -----CH3 2) CH2+ -----NH2 3) CH2+ -----OH 4):CH2+ -----SH
Answer» 38. Most stable carbocation is? 1) CH2+ -----CH3 2) CH2+ -----NH2 3) CH2+ -----OH 4):CH2+ -----SH

Discussion

42.	The reaction A → C has activation for the forward and the backward reaction as 25 kJ and 32 kJ respectively. The Δ H for the reaction is
Answer» The reaction A $\to$ C has activation for the forward and the backward reaction as 25 kJ and 32 kJ respectively. The $Δ$ H for the reaction is

Discussion

43.	90. Calculate degree of dissociation of 0.02M acetic acid at 298K. Give that (CH3COOH)=17.37Scm²m-¹,H+=345.8Scm²m-¹, CH3COO-=40.2Scm²m-¹
Answer» 90. Calculate degree of dissociation of 0.02M acetic acid at 298K. Give that (CH3COOH)=17.37Scm²m-¹,H+=345.8Scm²m-¹, CH3COO-=40.2Scm²m-¹

Discussion

44.	Number of double bonds present in styrene is:
Answer» Number of double bonds present in styrene is:

Discussion

45.	(i) Drawthe structures of all isomeric alcohols of molecular formula C5H12Oand give their IUPAC names.(ii) Classify the isomers of alcohols in question 11.3 (i) as primary,secondary and tertiary alcohols.
Answer» (i) Draw the structures of all isomeric alcohols of molecular formula C₅H₁₂O and give their IUPAC names. (ii) Classify the isomers of alcohols in question 11.3 (i) as primary, secondary and tertiary alcohols.

45.

(i) Drawthe structures of all isomeric alcohols of molecular formula C5H12Oand give their IUPAC names.(ii) Classify the isomers of alcohols in question 11.3 (i) as primary,secondary and tertiary alcohols.

Answer»

(i) Draw
the structures of all isomeric alcohols of molecular formula C₅H₁₂O
and give their IUPAC names.

(ii)
Classify the isomers of alcohols in question 11.3 (i) as primary,
secondary and tertiary alcohols.

Discussion

46.	CaCN2+C is called
Answer» $C a C N_{2} + C$ is called

Discussion

47.	explain estimation of very small dis†an ces:size ofmolecule
Answer» explain estimation of very small dis†an ces:size ofmolecule

Discussion

48.	Liquids A and B form an ideal solution in the entire compositon range. At 350 K, the vapor pressures of pure A and pure B are 7×103 Pa and 12×103 Pa respectively. The composition of the vapor in equilibrium with a solution containing 40 mole percent of A at this temperature is:
Answer» Liquids $A$ and $B$ form an ideal solution in the entire compositon range. At $350 K$ , the vapor pressures of pure $A$ and pure $B$ are $7 \times 10^{3} Pa$ and $12 \times 10^{3} Pa$ respectively. The composition of the vapor in equilibrium with a solution containing $40$ mole percent of $A$ at this temperature is:

Discussion

49.	The enthalpy change in the reaction, 2CO + O2⟶2CO2 is termed as:
Answer» The enthalpy change in the reaction, $2 C O + O_{2} ⟶ 2 C O_{2}$ is termed as:

Discussion

50.	Out of He and He2+ which one has a longer bond length?
Answer» Out of $H e$ and $H e^{2 +}$ which one has a longer bond length?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The bond formed by a shared pair of electrons, with both electrons coming from the same atom, is known as :

Write down the maximum number of electrons that s, p and d-subshells can accomodate.

Which statement regarding an orbital is FALSE?

A solution of caustic soda in water or when fused, conducts an electric current. What is the similarity in these two cases?

How do you express the bond strength in terms of bond order?

F=f(z)dF/dZ=0 then F=max.why

The mass of 350cm^3 of a diatomic gas at 273K at 2atm is one gram. Calculate the mass of one atom of the gas?

66.Triple bondenergy order in decreasing order will be of co, N2 , cn , cc

Which of the following is not a state function?

9. Which among the following contains highest number of atoms 1. 49g of H2SO4 2. 49g of H3PO4 3.16g of CH4 4. 64g of SO2

deravation of temperature formulas1)celsius to farenheit2)farenheit to celsius3)celsius to kelvin

An explosion of atomic bomb release an energy of 7.6×1013 J. If 200 MeV energy is released in fission of one U235 atom, then the number of uranium atoms undergoing fission and the mass of uranium used in the tom bomb

For the reaction MCO3(s)—MO(s)+CO2 (g) ∆H=82.8kj at 25°C ∆E or ∆U at 25°C is

24.A neutron(mass 1.67\ast10^-27kg) moving at a speed of 1\ast10^8ms collides with a deutron (mass 3.34\ast10^-27kg)at rest and sticks to it find the speed of the composite particle triton

A:p- hydroxybenzaldehyde shows higher boiling point than o-hydroxy benzaldehyde B: Maximum molecular weight of HF in vapour state is 120(atomic weight of H=1, F=19) C.p-hydroxybenzaldehyde can be purified by steam distillation due to inter molecular hydrogen bonding The correct statements are

A hydrocarbon of molecular formula C5H10 on monochlorination gives one product and on dichlorination gives three products (excluding stereo isomers). Identify the hydrocarbon.

what is the product when tertiary butyl benzene is oxidised bKMnO4?

The oxidation state of N in nitrogen sesquioxide is:

In which of the following elements +1 oxidation state is more stable than +3 oxidation state?

One mole of an ideal gas is taken from a to b along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work done along the solid line path is Ws and that along the dotted line path is Wd then the integer closest to the ratio WdWs is:___

Which of the following metal does not react with the solution of copper sulphate [CPMT 1999]

A compound is made of A,B,C forming ccp lattice. A occupies all lattice points whereas B and C occupy alternate tetrahedral voids. If all atoms along the body diagonal are removed the formula of compound is

What is the oxidation state of chlorine in calcium salt of Bleaching Powder Ca(OCl)2?

How Tetraheddral void length ie r+ + r- is _/3a / 4

In an interference pattern the (n+4)th blue bright fringe and nth red bright fringe are formed at the same spot. If red and blue light have the wavelength of 7800 ˚A and 5200 ˚A then value of n should be:

Number of probable product(s) of the above reaction is:

The total number of bonds in the elemental white phosphorous molecule is

The osmotic pressure of a solution in atm obtained onmixing each 50 mL of 1.2% mass/vol. urea solution and24% mass/vol. glucose solution at 300 K(R -0.08 litre atm K^{-1} mol^-)

14.A solid conducting sphere having a charge Q is surrounded by an uncharged concentric spherical shell of copper.The potential difference between surface of this solid sphere and spherical shell is V. The shell is given a charge -3Q what is the new potential difference between them?

The correct order of decreasing ionic radii among the following isoelectronic species is:

Consider the following equilibrium constants for a triprotic acid H3PO4---First ionisation constant is k1.Second ions. const. is k2 and likewise third ionisation constant is k3.So, which of the following orders is correct ?k1>k3>k2k3>k2>k1k1>k2>k3 and what is the reason for this ?

Which of the following does not contain a bond between two sulphur atoms?

what are vector laws

The electronic configuration 3p6,3d9 represents a

In an atom, which has 2K,8L,18M and 2N electrons in the ground state .The total number of electrons having magnetic quantum number , m=0

Diazonium cation attack at C or N- atom of aniline ?explain this.

why does thermal stability of oxides, hydroxides etc of 2nd group elements increases down the group ?? and shouldn't it decrease down the group as the size of atom is increasing ??

Which of the following species does not use dz2 orbitals in hybridisation?

38. Most stable carbocation is? 1) CH2+ -----CH3 2) CH2+ -----NH2 3) CH2+ -----OH 4):CH2+ -----SH

The reaction A → C has activation for the forward and the backward reaction as 25 kJ and 32 kJ respectively. The Δ H for the reaction is

90. Calculate degree of dissociation of 0.02M acetic acid at 298K. Give that (CH3COOH)=17.37Scm²m-¹,H+=345.8Scm²m-¹, CH3COO-=40.2Scm²m-¹

Number of double bonds present in styrene is:

(i) Drawthe structures of all isomeric alcohols of molecular formula C5H12Oand give their IUPAC names.(ii) Classify the isomers of alcohols in question 11.3 (i) as primary,secondary and tertiary alcohols.

CaCN2+C is called

explain estimation of very small dis†an ces:size ofmolecule

Liquids A and B form an ideal solution in the entire compositon range. At 350 K, the vapor pressures of pure A and pure B are 7×103 Pa and 12×103 Pa respectively. The composition of the vapor in equilibrium with a solution containing 40 mole percent of A at this temperature is:

The enthalpy change in the reaction, 2CO + O2⟶2CO2 is termed as:

Out of He and He2+ which one has a longer bond length?