46295 + Interview Questions in Chemistry

1.	Reagent(s) used in the conversion of R−CH2−OH→R−CH3:
Answer» Reagent(s) used in the conversion of $R - C H_{2} - O H \to R - C H_{3} :$

Discussion

2.	At 298 K and 1 atm pressure, the partial pressures in an equilibrium mixture of N2O4 and NO2 are 0.7 and 0.3 atmosphere respectively. What will be the partial pressure of NO2 when the gases are in equilibrium at 298 K and at a total (equilibrium) pressure of 10 atmospheres?
Answer» At 298 K and 1 atm pressure, the partial pressures in an equilibrium mixture of $N_{2} O_{4}$ and $N O_{2}$ are 0.7 and 0.3 atmosphere respectively. What will be the partial pressure of $N O_{2}$ when the gases are in equilibrium at 298 K and at a total (equilibrium) pressure of 10 atmospheres?

Discussion

3.	The order in which the atomic radius increases is as follows
Answer» The order in which the atomic radius increases is as follows

Discussion

4.	A known mass of NaOH is dissolved in water to make 1 litre of the solution. 10 mL of the solution requires 20 ml of 1 M HCl. Molar mass of NaOH is 40 g/mol. The number of grams of NaOH in the original solution is
Answer» A known mass of NaOH is dissolved in water to make 1 litre of the solution. 10 mL of the solution requires 20 ml of 1 M HCl. Molar mass of NaOH is 40 g/mol. The number of grams of NaOH in the original solution is

Discussion

5.	The number of bond pairs and lone pairs in H2O are _____ & _____ respectively.
Answer» The number of bond pairs and lone pairs in $H_{2} O$ are _____ & _____ respectively.

Discussion

6.	Calculate the mass of K2Cr2O7 required to produce 254 g I2 from KI solution. K2Cr2O7+KI→Cr3++I2 (Molar mass of K2Cr2O7 is 294 g mol−1)
Answer» Calculate the mass of $K_{2} C r_{2} O_{7}$ required to produce $254 g I_{2}$ from $K I$ solution. $K_{2} C r_{2} O_{7} + K I \to C r^{3 +} + I_{2}$ (Molar mass of $K_{2} C r_{2} O_{7}$ is $294 g m o l^{- 1}$ )

Discussion

7.	Hydrogenation of benzyl chloride in the presence of Pd−BaSO4 is called -
Answer» Hydrogenation of benzyl chloride in the presence of $P d - B a S O_{4}$ is called -

Discussion

8.	What are the factors responsible for the inaccuracy in atomic radius?
Answer» What are the factors responsible for the inaccuracy in atomic radius?

Discussion

9.	C6H14 has 2 tertiary carbon atoms. What would be its IUPAC name?
Answer» $C_{6} H_{14}$ has 2 tertiary carbon atoms. What would be its IUPAC name?

Discussion

10.	A conjugated alkadiene having molecular formula C12H22 on ozonolysis yields butanone, ethanedial and cyclohexanecarbaldehyde. Which of the following is the correct structural formula ofthe alkadiene.
Answer» A conjugated alkadiene having molecular formula $C_{12} H_{22}$ on ozonolysis yields butanone, ethanedial and cyclohexanecarbaldehyde. Which of the following is the correct structural formula ofthe alkadiene.

Discussion

11.	The alkaline earth metals which do not give colour to flame is:
Answer» The alkaline earth metals which do not give colour to flame is:

Discussion

12.	why is electron affinty of sulphur greater than oxygen
Answer» why is electron affinty of sulphur greater than oxygen

Discussion

13.	Using valence bond theory, explain the following in relation to the complexes given below [Mn(CN)6]3−,[Co(NH3)6]3+,[Cr(H2O)6]3+,[FeCl6]4− (a) Type of hybridisation (b) Inner or outer orbital (c) Magnetic behaviour (d) Spin only magnetic moment value.
Answer» Using valence bond theory, explain the following in relation to the complexes given below $[M n (C N)_{6}]^{3 -}, [C o (N H_{3})_{6}]^{3 +}, [C r (H_{2} O)_{6}]^{3 +}, [F e C l_{6}]^{4 -}$ (a) Type of hybridisation (b) Inner or outer orbital (c) Magnetic behaviour (d) Spin only magnetic moment value.

Discussion

14.	The basic character of ethyl amine, diethyl amine and triethyl amine in chlorobenzene is
Answer» The basic character of ethyl amine, diethyl amine and triethyl amine in chlorobenzene is

Discussion

15.	One mole of N2 and 3 moles of PCl5 are placed in a 100 litre vessel heated to 227∘C. The equilibrium pressure is 2.05 atm. Assuming ideal behaviour, calculate degree of dissociation of PCl5 for the reaction PCl5⇌PCl3+Cl2.
Answer» One mole of $N_{2} a n d 3$ moles of $P C l_{5}$ are placed in a 100 litre vessel heated to $227^{\circ} C$ . The equilibrium pressure is 2.05 atm. Assuming ideal behaviour, calculate degree of dissociation of $P C l_{5}$ for the reaction $P C l_{5} ⇌ P C l_{3} + C l_{2}$ .

Discussion

16.	Which of the following prefixes means ‘together’?
Answer» Which of the following prefixes means ‘together’?

Discussion

17.	In a container, a mixture is prepared by mixing of samples of hydrogen atom, helium ion (He+) and lithium ion (Li2+). In the sample, all the hydrogen atoms are in 1st excited stae and all the He+ ions are in third excited state and all the Li2+ ions are in fifth excited state. Find the total number of spectral lines observed in the emission spectrum of such a sample, when the electrons return back upto the ground state.
Answer» In a container, a mixture is prepared by mixing of samples of hydrogen atom, helium ion $(H e^{+})$ and lithium ion $(L i^{2 +})$ . In the sample, all the hydrogen atoms are in $1^{s t}$ excited stae and all the $H e^{+}$ ions are in third excited state and all the $L i^{2 +}$ ions are in fifth excited state. Find the total number of spectral lines observed in the emission spectrum of such a sample, when the electrons return back upto the ground state.

Discussion

18.	Addition of HBr to which alkene gives only one type of product
Answer» Addition of HBr to which alkene gives only one type of product

Discussion

19.	write the value of 1 radians in degree minutes and seconds
Answer» write the value of 1 radians in degree minutes and seconds

Discussion

20.	Calculate the magnitude of spin angular momentum of an electron.
Answer» Calculate the magnitude of spin angular momentum of an electron.

Discussion

21.	Which type of void is represented by the following diagram?
Answer» Which type of void is represented by the following diagram?

Discussion

22.	Calculate the average kinetic energy in joule per molecule in 8.0 g of methane at 27∘ C
Answer» Calculate the average kinetic energy in joule per molecule in 8.0 g of methane at $27^{\circ} C$

Discussion

23.	The correct order of the metallic character is:
Answer» The correct order of the metallic character is:

Discussion

24.	Phenol is reduced to benzene in presence of:
Answer» Phenol is reduced to benzene in presence of:

Discussion

25.	Use the following data to calculate the lattice energy of caesium oxide. Enthalpy of formation of caesium oxide = −233 kJ mol−1 Enthalpy of sublimation of Cs=+78 kJ mol−1 First ionization energy of Cs=+375 kJ mol−1 Enthalpy of dissociation of O2 (g)=494 kJ mol−1of O2 molecules First electron affinity of O=−141 kJ mol−1 of O atoms Second electron affinity of O=+845 kJ mol−1 of O1− ions
Answer» Use the following data to calculate the lattice energy of caesium oxide. Enthalpy of formation of caesium oxide = $- 233 k J m o l^{- 1}$ Enthalpy of sublimation of $C s = + 78 k J m o l^{- 1}$ First ionization energy of $C s = + 375 k J m o l^{- 1}$ Enthalpy of dissociation of $O_{2} (g) = 494 k J m o l^{- 1} o f O_{2} m o l e c u l e s$ First electron affinity of $O = - 141 k J m o l^{- 1} o f O a t o m s$ Second electron affinity of $O = + 845 k J m o l^{- 1} o f O^{1 -} i o n s$

Discussion

26.	When one mole of an ideal gas is compressed to half of the initial volume and simultaneously heated to twice of its initial temperature, the change in enthalpy (ΔS) is (Considering the process to be isobaric)
Answer» When one mole of an ideal gas is compressed to half of the initial volume and simultaneously heated to twice of its initial temperature, the change in enthalpy $(Δ S)$ is (Considering the process to be isobaric)

Discussion

27.	Lyophilic sols are
Answer» Lyophilic sols are

Discussion

28.	[PtBrCl(NO2)NH3]I on ionisation gives the ion:
Answer» $[P t B r C l (N O_{2}) N H_{3}] I$ $o n i o n i s a t i o n g i v e s t h e i o n$ :

Discussion

29.	The pH of 0.1 M solution of aniline is 8.8. Its pKb value will be:
Answer» The $p H$ of $0.1 M$ solution of aniline is $8.8$ . Its $p K_{b}$ value will be:

Discussion

30.	4 mol of a mixture containing one mol each of LiNO3, MgNO3 NaNO3,Ca(NO3)2 is decomposed on strong heating. The total number of moles of NO2 (g) evolved is: (assuming complete decomposition of all the salts)
Answer» 4 mol of a mixture containing one mol each of $L i N O_{3}, M g N O_{3} N a N O 3, C a (N O_{3})_{2}$ is decomposed on strong heating. The total number of moles of $N O_{2} (g)$ evolved is: (assuming complete decomposition of all the salts)

Discussion

31.	Which of the following statements is/are correct regarding A, B and C?
Answer» Which of the following statements is/are correct regarding A, B and C?

Discussion

32.	Identify the final product.
Answer» Identify the final product.

Discussion

33.	XeF2 is isostructural with-
Answer» $X e F_{2}$ is isostructural with-

Discussion

34.	Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. give reason
Answer» Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. give reason

Discussion

35.	Calculate % ionic character in HCl. [bond length = 1.275 0A μobserved = 1.03 D]
Answer» Calculate % ionic character in HCl. [bond length = $1.275 0 A$ $μ_{o b s e r v e d}$ = $1.03 D$ ]

35.

Calculate % ionic character in HCl. [bond length = 1.275 0A μobserved = 1.03 D]

Answer»

Calculate % ionic character in HCl.

[bond length = $1.275 0 A$ $μ_{o b s e r v e d}$ = $1.03 D$ ]

Discussion

36.	12.5g of commercial sodium bicarbonate on heating gives 3g of CO2.What is the % purity of the sample?
Answer» 12.5g of commercial sodium bicarbonate on heating gives 3g of CO2.What is the % purity of the sample?

Discussion

37.	The ionic radii of A+ and B− are 1.7A∘ and 1.8A∘ respectively. Find the coordination number of A+.
Answer» The ionic radii of $A^{+}$ and $B^{-}$ are $1.7 A^{\circ}$ and $1.8 A^{\circ}$ respectively. Find the coordination number of $A^{+}$ .

Discussion

38.	Explain the whole topic imperfection (defects)in solids?
Answer» Explain the whole topic imperfection (defects)in solids?

Discussion

39.	When 0.1 mole of MnO2−4 is oxidized the quantity of electricity required to completely oxidise MnO2−4 to MnO−4 is
Answer» When 0.1 mole of $M n O_{4}^{2 -}$ is oxidized the quantity of electricity required to completely oxidise $M n O_{4}^{2 -}$ to $M n O_{4}^{-}$ is

Discussion

40.	Pair of Molecules having identical geometry is :
Answer» Pair of Molecules having identical geometry is :

Discussion

41.	Which of the following is most stable, and which one is least ? HCHO CH3CHO I II CH3COCH3 Cl3CCHO III IV
Answer» Which of the following is most stable, and which one is least ? $H C H O$ $C H_{3} C H O$ I II $C H_{3} C O C H_{3}$ $C l_{3} C C H O$ III IV

Discussion

42.	0.1 mole of HCl is added to 2 litres of buffer solution. The decreases in pH of that buffer by 0.5. Then the buffer capacity is
Answer» 0.1 mole of HCl is added to 2 litres of buffer solution. The decreases in pH of that buffer by 0.5. Then the buffer capacity is

Discussion

43.	The number of hydrogen atoms present in one mole of hydrogen molecule is:
Answer» The number of hydrogen atoms present in one mole of hydrogen molecule is:

Discussion

44.	What is the ratio of the empirical formula mass to the molecular formula mass of benzene?
Answer» What is the ratio of the empirical formula mass to the molecular formula mass of benzene?

Discussion

45.	How is Benzene diazonium chloride converted to Benzene?
Answer» How is Benzene diazonium chloride converted to Benzene?

Discussion

46.	Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is
Answer» Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is

46.

Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is

Answer»

Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is

Discussion

47.	If unit cell of a mineral has cubic closed packed array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ion and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively are
Answer» If unit cell of a mineral has cubic closed packed array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ion and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively are

Discussion

48.	Oxidation number of P in PO3−4 of S in SO2−4 and that of Cr in Cr2O2−7 are respectively
Answer» Oxidation number of P in $P O_{4}^{3 -}$ of S in $S O_{4}^{2 -}$ and that of Cr in $C r_{2} O_{7}^{2 -}$ are respectively

Discussion

49.	SO2 is obtained when
Answer» $S O_{2}$ is obtained when

49.

SO2 is obtained when

Answer»

$S O_{2}$ is obtained when

Discussion

50.	The electrophile involved in the above reaction is
Answer» The electrophile involved in the above reaction is

50.

The electrophile involved in the above reaction is

Answer»

The electrophile involved in the above reaction is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Reagent(s) used in the conversion of R−CH2−OH→R−CH3:

At 298 K and 1 atm pressure, the partial pressures in an equilibrium mixture of N2O4 and NO2 are 0.7 and 0.3 atmosphere respectively. What will be the partial pressure of NO2 when the gases are in equilibrium at 298 K and at a total (equilibrium) pressure of 10 atmospheres?

The order in which the atomic radius increases is as follows

A known mass of NaOH is dissolved in water to make 1 litre of the solution. 10 mL of the solution requires 20 ml of 1 M HCl. Molar mass of NaOH is 40 g/mol. The number of grams of NaOH in the original solution is

The number of bond pairs and lone pairs in H2O are _____ &amp; _____ respectively.

Calculate the mass of K2Cr2O7 required to produce 254 g I2 from KI solution. K2Cr2O7+KI→Cr3++I2 (Molar mass of K2Cr2O7 is 294 g mol−1)

Hydrogenation of benzyl chloride in the presence of Pd−BaSO4 is called -

What are the factors responsible for the inaccuracy in atomic radius?

C6H14 has 2 tertiary carbon atoms. What would be its IUPAC name?

A conjugated alkadiene having molecular formula C12H22 on ozonolysis yields butanone, ethanedial and cyclohexanecarbaldehyde. Which of the following is the correct structural formula ofthe alkadiene.

The alkaline earth metals which do not give colour to flame is:

why is electron affinty of sulphur greater than oxygen

Using valence bond theory, explain the following in relation to the complexes given below [Mn(CN)6]3−,[Co(NH3)6]3+,[Cr(H2O)6]3+,[FeCl6]4− (a) Type of hybridisation (b) Inner or outer orbital (c) Magnetic behaviour (d) Spin only magnetic moment value.

The basic character of ethyl amine, diethyl amine and triethyl amine in chlorobenzene is

One mole of N2 and 3 moles of PCl5 are placed in a 100 litre vessel heated to 227∘C. The equilibrium pressure is 2.05 atm. Assuming ideal behaviour, calculate degree of dissociation of PCl5 for the reaction PCl5⇌PCl3+Cl2.

Which of the following prefixes means ‘together’?

Addition of HBr to which alkene gives only one type of product

write the value of 1 radians in degree minutes and seconds

Calculate the magnitude of spin angular momentum of an electron.

Which type of void is represented by the following diagram?

Calculate the average kinetic energy in joule per molecule in 8.0 g of methane at 27∘ C

The correct order of the metallic character is:

Phenol is reduced to benzene in presence of:

When one mole of an ideal gas is compressed to half of the initial volume and simultaneously heated to twice of its initial temperature, the change in enthalpy (ΔS) is (Considering the process to be isobaric)

Lyophilic sols are

[PtBrCl(NO2)NH3]I on ionisation gives the ion:

The pH of 0.1 M solution of aniline is 8.8. Its pKb value will be:

4 mol of a mixture containing one mol each of LiNO3, MgNO3 NaNO3,Ca(NO3)2 is decomposed on strong heating. The total number of moles of NO2 (g) evolved is: (assuming complete decomposition of all the salts)

Which of the following statements is/are correct regarding A, B and C?

Identify the final product.

XeF2 is isostructural with-

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. give reason

Calculate % ionic character in HCl. [bond length = 1.275 0A μobserved = 1.03 D]

12.5g of commercial sodium bicarbonate on heating gives 3g of CO2.What is the % purity of the sample?

The ionic radii of A+ and B− are 1.7A∘ and 1.8A∘ respectively. Find the coordination number of A+.

Explain the whole topic imperfection (defects)in solids?

When 0.1 mole of MnO2−4 is oxidized the quantity of electricity required to completely oxidise MnO2−4 to MnO−4 is

Pair of Molecules having identical geometry is :

Which of the following is most stable, and which one is least ? HCHO CH3CHO I II CH3COCH3 Cl3CCHO III IV

0.1 mole of HCl is added to 2 litres of buffer solution. The decreases in pH of that buffer by 0.5. Then the buffer capacity is

The number of hydrogen atoms present in one mole of hydrogen molecule is:

What is the ratio of the empirical formula mass to the molecular formula mass of benzene?

How is Benzene diazonium chloride converted to Benzene?

Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is

If unit cell of a mineral has cubic closed packed array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ion and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively are

Oxidation number of P in PO3−4 of S in SO2−4 and that of Cr in Cr2O2−7 are respectively

SO2 is obtained when

The electrophile involved in the above reaction is

The number of bond pairs and lone pairs in H2O are _ & _ respectively.