46295 + Interview Questions in Chemistry

1.	The standard reduction potential values of three metallic cations, X, Y and Z are 0.52, -3.03, and -1.18 V, respectively. The order of reducing power of the corresponding metal is
Answer» The standard reduction potential values of three metallic cations, X, Y and Z are 0.52, -3.03, and -1.18 V, respectively. The order of reducing power of the corresponding metal is

Discussion

2.	How the greater electronic charge density affects the more attractions of electrons in the electronegative atoms??🤔🤔🤔 If there is a greater electronic charge density, then , it must be satisfied with the electrons, and thus the attractions will decrease. But Sir said, greater electronic charge density leads to have a tendency to attract more electrons in the electronegative atoms. Why does this happen???🤔🤔🤔 And what is the actual explanation??
Answer» How the greater electronic charge density affects the more attractions of electrons in the electronegative atoms??🤔🤔🤔 If there is a greater electronic charge density, then , it must be satisfied with the electrons, and thus the attractions will decrease. But Sir said, greater electronic charge density leads to have a tendency to attract more electrons in the electronegative atoms. Why does this happen???🤔🤔🤔 And what is the actual explanation??

Discussion

3.	EAN of cobalt is 36 in knowing that atomic number of Co is 27, is present as
Answer» EAN of cobalt is 36 in knowing that atomic number of Co is 27, is present as

Discussion

4.	40% of pcl5 is not dissociated at 300^° c the reaction is carried out in a flask of 1ltr capacity the value of kc would b
Answer» 40% of pcl5 is not dissociated at 300^° c the reaction is carried out in a flask of 1ltr capacity the value of kc would b

Discussion

5.	What is rate law expression?
Answer» What is rate law expression?

Discussion

6.	what is law of conservation of mass and definite proportions?
Answer» what is law of conservation of mass and definite proportions?

Discussion

7.	Number of ions present in aqueous solution ofHCl is
Answer» Number of ions present in aqueous solution ofHCl is

Discussion

8.	What is the lowest value of n that allows g orbitals to exist?
Answer» What is the lowest value of n that allows g orbitals to exist?

Discussion

9.	suppose a pure si crystal has 51028 atoms per meter3.it is doped by 1 ppm concentration of pentavalent As.Calculate the number of electrons and holes.Given that ni=1.51016 per m3.
Answer» suppose a pure si crystal has 51028 atoms per meter3.it is doped by 1 ppm concentration of pentavalent As.Calculate the number of electrons and holes.Given that ni=1.51016 per m3.

Discussion

10.	Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.
Answer» Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

Discussion

11.	Select the Correct statement :
Answer» Select the Correct statement :

Discussion

12.	Ionic radii of Mg2+ and O2− ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of Mg2+ ion respectively are
Answer» Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion respectively are

Discussion

13.	What is specific volume?
Answer» What is specific volume?

Discussion

14.	In methyl alcohol solution, bromine reacts with ethylene to yield in addition to 1, 2-dibromoethane because
Answer» In methyl alcohol solution, bromine reacts with ethylene to yield in addition to 1, 2-dibromoethane because

Discussion

15.	14. solubility of CaF2 in a solution of Ca(NO3)2 will be represented by the concentration term a)Ca2+ b)2F- c)2NO3- d)1/2 F-
Answer» 14. solubility of CaF2 in a solution of Ca(NO3)2 will be represented by the concentration term a)Ca2+ b)2F- c)2NO3- d)1/2 F-

Discussion

16.	The ionization constant of acetic acid is 1.74 × 10–5. Calculate the degree of dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.
Answer» The ionization constant of acetic acid is 1.74 × 10^–5. Calculate the degree of dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.

Discussion

17.	21. Solid crystallizes in body centred cubic lattice with cell edge=4.29A.What is the radius of sodium atom?
Answer» 21. Solid crystallizes in body centred cubic lattice with cell edge=4.29A.What is the radius of sodium atom?

Discussion

18.	The ratio of mass of electron to mass of hydrogen atom
Answer» The ratio of mass of electron to mass of hydrogen atom

Discussion

19.	Magnitude of which of the following property of alkali metals increases with the increase of atomic number
Answer» Magnitude of which of the following property of alkali metals increases with the increase of atomic number

Discussion

20.	percentage of sulphur in volcanised rubber is 0.05% by mass . calculate the molar mass of compound if volkanised rubber has 3 atoms of sulphur per molecule in it.
Answer» percentage of sulphur in volcanised rubber is 0.05% by mass . calculate the molar mass of compound if volkanised rubber has 3 atoms of sulphur per molecule in it.

Discussion

21.	Which of the following has highest ionic radii?
Answer» Which of the following has highest ionic radii?

Discussion

22.	Ammonium dichromate is used in fireworks. The green coloured powder blown in air is
Answer» Ammonium dichromate is used in fireworks. The green coloured powder blown in air is

Discussion

23.	Which statement is not correct?
Answer» Which statement is not correct?

Discussion

24.	18. 0.202gm of a substance gave on combustion 0.361gm of CO2and 0.147gm H2O .What is the empirical formula of the substance?
Answer» 18. 0.202gm of a substance gave on combustion 0.361gm of CO2and 0.147gm H2O .What is the empirical formula of the substance?

Discussion

25.	Which of the following is an example of symmetrical or simple ether?
Answer» Which of the following is an example of symmetrical or simple ether?

Discussion

26.	To synthesize the following via a single-step SN2 reaction starting from an alkyl halide,
Answer» To synthesize the following via a single-step $S_{N} 2$ reaction starting from an alkyl halide,

Discussion

27.	If x+1/x= 5, then √x+1/√x=
Answer» If x+1/x= 5, then √x+1/√x=

Discussion

28.	Identify the type of each of the following chemical reactions. The reaction of the heating of ferrous sulphate to form a ferric oxide, sulphur dioxide and sulphur trioxide gas. The reaction between zinc and hydrochloric acid to form zinc chloride. The reaction between hydrogen and chlorine gases and forming hydrogen chloride.
Answer» Identify the type of each of the following chemical reactions. The reaction of the heating of ferrous sulphate to form a ferric oxide, sulphur dioxide and sulphur trioxide gas. The reaction between zinc and hydrochloric acid to form zinc chloride. The reaction between hydrogen and chlorine gases and forming hydrogen chloride.

28.

Identify the type of each of the following chemical reactions. The reaction of the heating of ferrous sulphate to form a ferric oxide, sulphur dioxide and sulphur trioxide gas. The reaction between zinc and hydrochloric acid to form zinc chloride. The reaction between hydrogen and chlorine gases and forming hydrogen chloride.

Answer»

Identify the type of each of the following chemical reactions.

The reaction of the heating of ferrous sulphate to form a ferric oxide, sulphur dioxide and sulphur trioxide gas.

The reaction between zinc and hydrochloric acid to form zinc chloride.

The reaction between hydrogen and chlorine gases and forming hydrogen chloride.

Discussion

29.	Arrange in increasing order of basic strength giving reason: C2H5NH2, C6H5NH2,(C2H5)2NH
Answer» Arrange in increasing order of basic strength giving reason: C2H5NH2, C6H5NH2,(C2H5)2NH

Discussion

30.	Why longer chain carboxylic acids , say propanoic acid , are more acidic than smaller ones like ethanoic acid in gaseous phase?
Answer» Why longer chain carboxylic acids , say propanoic acid , are more acidic than smaller ones like ethanoic acid in gaseous phase?

Discussion

31.	In the commercial manufacture of ethyl alcohol from starchy substances by fermentation method, which enzymes stepwise complete the fermentation reaction [BIT 1992]
Answer» In the commercial manufacture of ethyl alcohol from starchy substances by fermentation method, which enzymes stepwise complete the fermentation reaction [BIT 1992]

Discussion

32.	When benzene sulphonic acid and p-nitrophenol are treated with NaHCO3, the gases released, respectively, are:
Answer» When benzene sulphonic acid and p-nitrophenol are treated with $N a H C O_{3},$ the gases released, respectively, are:

Discussion

33.	1M solution of monobasic acid HX has molar conductivity x S cm^2 mol^-1. While molar conductivity of H+ and X- at infinite dilution is 300 s cm^2mol^-1 and 100 S cm^2 mol^-1. The 1M HX solution contains 0.15 M H+. If this 1M is filled in a conducting cell if cell constant 0.1 cm^-1, the conductance is found to be Y ohm^-1. Find the value of 10Y
Answer» 1M solution of monobasic acid HX has molar conductivity x S cm^2 mol^-1. While molar conductivity of H+ and X- at infinite dilution is 300 s cm^2mol^-1 and 100 S cm^2 mol^-1. The 1M HX solution contains 0.15 M H+. If this 1M is filled in a conducting cell if cell constant 0.1 cm^-1, the conductance is found to be Y ohm^-1. Find the value of 10Y

Discussion

34.	what is a spherical node
Answer» what is a spherical node

Discussion

35.	The percentage of C,H and N in an organic compound are 40%, 13.3% and 46.7% respectively then emprirical formula is :
Answer» The percentage of C,H and N in an organic compound are 40%, 13.3% and 46.7% respectively then emprirical formula is :

Discussion

36.	Pent-4-yn-2-ol has the structure?
Answer» Pent-4-yn-2-ol has the structure?

Discussion

37.	What is the e/m ratio of sulphur ion
Answer» What is the e/m ratio of sulphur ion

Discussion

38.	△H and △S for the reaction: Ag2O(s)→2Ag(s)+12O2(g) are 30.56 kJ mol−1 and 66.0 J K−1mol−1 respectively. Calculate the temperature at which free energy change for the reaction will be zero. Predict whether the forward reaction will be favored above or below this temperature.
Answer» $△ H$ and $△ S$ for the reaction: $A g_{2} O (s) \to 2 A g (s) + \frac{1}{2} O_{2} (g)$ are 30.56 kJ $m o l^{- 1}$ and 66.0 J $K^{- 1} m o l^{- 1}$ respectively. Calculate the temperature at which free energy change for the reaction will be zero. Predict whether the forward reaction will be favored above or below this temperature.

Discussion

39.	Identify the intensive quantities from the following.
Answer» Identify the intensive quantities from the following.

Discussion

40.	Kinetic and Potential energy (in eV) of electron present in second Bohr's orbit of Hydrogen atom are respectively [Energy of first Bohr's orbit = -13.6eV] ?
Answer» Kinetic and Potential energy (in eV) of electron present in second Bohr's orbit of Hydrogen atom are respectively [Energy of first Bohr's orbit = -13.6eV] ?

Discussion

41.	When unit mass of water boils to become steam at 100∘C, it absorbs Q amount of heat. The densities of water and steam at 100∘C are ρ1and ρ2 respectively, and the atmospheric pressure is p0. The increase in the internal energy of the water is (correct answer + 1, wrong answer - 0.25)
Answer» When unit mass of water boils to become steam at $100^{\circ} C$ , it absorbs $Q$ amount of heat. The densities of water and steam at $100^{\circ} C$ are $ρ_{1}$ and $ρ_{2}$ respectively, and the atmospheric pressure is $p_{0}$ . The increase in the internal energy of the water is (correct answer + 1, wrong answer - 0.25)

Discussion

42.	Schottky defect in crystals is observed when[CBSE PMT 1998; KCET 2002]
Answer» Schottky defect in crystals is observed when [CBSE PMT 1998; KCET 2002]

42.

Schottky defect in crystals is observed when[CBSE PMT 1998; KCET 2002]

Answer»

Schottky defect in crystals is observed when

[CBSE PMT 1998; KCET 2002]

Discussion

43.	Two miscible liquids of densities 1.2 gm/cc and 1.4 gm/cc are mixed with a proportion ratio of their volumes equal to 3:5. Then, the density of the resulting liquid in gm/cc upto two decimals will be
Answer» Two miscible liquids of densities $1.2 gm/cc$ and $1.4 gm/cc$ are mixed with a proportion ratio of their volumes equal to $3 : 5$ . Then, the density of the resulting liquid in $gm/cc$ upto two decimals will be

Discussion

44.	Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will be
Answer» Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will be

Discussion

45.	The formation of the oxide ion, O2−(g) from oxygen atom requires first an exothermic and then an endothermic step as shown below:O(g)+e−→O−(g);ΔfH∘=−141 kJ mol−1O−(g)+e−→O2−(g);ΔfH∘=+780 kJ mol−1Thus, process of formation of O2− in gas phase is unfavourable even though O2− is isoelectronic with neon. It is due to the fact that,
Answer» The formation of the oxide ion, $O_{(g)}^{2 -}$ from oxygen atom requires first an exothermic and then an endothermic step as shown below: $O_{(g)} + e^{-} \to O_{(g)}^{-}; Δ_{f} H^{\circ} = - 141 k J m o l^{- 1} O_{(g)}^{-} + e^{-} \to O_{(g)}^{2 -}; Δ_{f} H^{\circ} = + 780 k J m o l^{- 1}$ Thus, process of formation of $O^{2 -}$ in gas phase is unfavourable even though $O^{2 -}$ is isoelectronic with neon. It is due to the fact that,

Discussion

46.	why rotation about carbon-carbon double bond is restricted in ethene molecule??
Answer» why rotation about carbon-carbon double bond is restricted in ethene molecule??

Discussion

47.	Humphrey Davy wanted to test out his electrolysis experiment of Sodium. He made 3 particular changes to his experiment. A. He increased current B. He increased voltage C. He increased the area of the electrode What would be his observations? Type the appropriate number from the following options here. ___ Increased rate of production of sodium in all cases. Increased production of sodium in all cases. No difference in production of sodium in all cases as compared to before changing. Increased rate of production in case A and decreased rate of production in case B and no change in case C. Increased rate of production in first 2 cases and decrease in 3rd case.
Answer» Humphrey Davy wanted to test out his electrolysis experiment of Sodium. He made 3 particular changes to his experiment. A. He increased current B. He increased voltage C. He increased the area of the electrode What would be his observations? Type the appropriate number from the following options here. ___ Increased rate of production of sodium in all cases. Increased production of sodium in all cases. No difference in production of sodium in all cases as compared to before changing. Increased rate of production in case A and decreased rate of production in case B and no change in case C. Increased rate of production in first 2 cases and decrease in 3rd case.

Discussion

48.	Reaction When haloalkene react with NaNH2/NH3(l) .
Answer» Reaction When haloalkene react with NaNH2/NH3(l) .

Discussion

49.	In the above question, a11 C21 + a12 C22 + a13 C23 = __________.
Answer» In the above question, a₁₁ C₂₁ + a₁₂ C₂₂ + a₁₃ C₂₃ = __________.

Discussion

50.	No of hydrogen atom in 3.6 gram of H2O is
Answer» No of hydrogen atom in 3.6 gram of H2O is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The standard reduction potential values of three metallic cations, X, Y and Z are 0.52, -3.03, and -1.18 V, respectively. The order of reducing power of the corresponding metal is

EAN of cobalt is 36 in knowing that atomic number of Co is 27, is present as

40% of pcl5 is not dissociated at 300^° c the reaction is carried out in a flask of 1ltr capacity the value of kc would b

What is rate law expression?

what is law of conservation of mass and definite proportions?

Number of ions present in aqueous solution ofHCl is

What is the lowest value of n that allows g orbitals to exist?

suppose a pure si crystal has 5*10*28 atoms per meter*3.it is doped by 1 ppm concentration of pentavalent As.Calculate the number of electrons and holes.Given that ni=1.5*10*16 per m*3.

Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

Select the Correct statement :

Ionic radii of Mg2+ and O2− ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of Mg2+ ion respectively are

What is specific volume?

In methyl alcohol solution, bromine reacts with ethylene to yield in addition to 1, 2-dibromoethane because

14. solubility of CaF2 in a solution of Ca(NO3)2 will be represented by the concentration term a)Ca2+ b)2F- c)2NO3- d)1/2 F-

The ionization constant of acetic acid is 1.74 × 10–5. Calculate the degree of dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.

21. Solid crystallizes in body centred cubic lattice with cell edge=4.29A.What is the radius of sodium atom?

The ratio of mass of electron to mass of hydrogen atom

Magnitude of which of the following property of alkali metals increases with the increase of atomic number

percentage of sulphur in volcanised rubber is 0.05% by mass . calculate the molar mass of compound if volkanised rubber has 3 atoms of sulphur per molecule in it.

Which of the following has highest ionic radii?

Ammonium dichromate is used in fireworks. The green coloured powder blown in air is

Which statement is not correct?

18. 0.202gm of a substance gave on combustion 0.361gm of CO2and 0.147gm H2O .What is the empirical formula of the substance?

Which of the following is an example of symmetrical or simple ether?

To synthesize the following via a single-step SN2 reaction starting from an alkyl halide,

If x+1/x= 5, then √x+1/√x=

Arrange in increasing order of basic strength giving reason: C2H5NH2, C6H5NH2,(C2H5)2NH

Why longer chain carboxylic acids , say propanoic acid , are more acidic than smaller ones like ethanoic acid in gaseous phase?

In the commercial manufacture of ethyl alcohol from starchy substances by fermentation method, which enzymes stepwise complete the fermentation reaction [BIT 1992]

When benzene sulphonic acid and p-nitrophenol are treated with NaHCO3, the gases released, respectively, are:

what is a spherical node

The percentage of C,H and N in an organic compound are 40%, 13.3% and 46.7% respectively then emprirical formula is :

Pent-4-yn-2-ol has the structure?

What is the e/m ratio of sulphur ion

△H and △S for the reaction: Ag2O(s)→2Ag(s)+12O2(g) are 30.56 kJ mol−1 and 66.0 J K−1mol−1 respectively. Calculate the temperature at which free energy change for the reaction will be zero. Predict whether the forward reaction will be favored above or below this temperature.

Identify the intensive quantities from the following.

Kinetic and Potential energy (in eV) of electron present in second Bohr's orbit of Hydrogen atom are respectively [Energy of first Bohr's orbit = -13.6eV] ?

When unit mass of water boils to become steam at 100∘C, it absorbs Q amount of heat. The densities of water and steam at 100∘C are ρ1and ρ2 respectively, and the atmospheric pressure is p0. The increase in the internal energy of the water is (correct answer + 1, wrong answer - 0.25)

Schottky defect in crystals is observed when[CBSE PMT 1998; KCET 2002]

Two miscible liquids of densities 1.2 gm/cc and 1.4 gm/cc are mixed with a proportion ratio of their volumes equal to 3:5. Then, the density of the resulting liquid in gm/cc upto two decimals will be

Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will be

why rotation about carbon-carbon double bond is restricted in ethene molecule??

Reaction When haloalkene react with NaNH2/NH3(l) .

In the above question, a11 C21 + a12 C22 + a13 C23 = __________.

No of hydrogen atom in 3.6 gram of H2O is

suppose a pure si crystal has 51028 atoms per meter3.it is doped by 1 ppm concentration of pentavalent As.Calculate the number of electrons and holes.Given that ni=1.51016 per m3.