46295 + Interview Questions in Chemistry

1.	What is normality of a solution?
Answer» What is normality of a solution?

Discussion

2.	Two vessels connected by a valve of negligible volume. One container (I) has 2.8 g of N2 at termperature T1(K). The other container (II) is completely evacuated. The container (I) is heated to T2 (K) while ontainer (II) is maintained at T2/3 (K). volume of vessel (I) is half that of vessel (II). If the valve isopened then what is the weight ratio of N2 in both vessel (WI/WII)?
Answer» Two vessels connected by a valve of negligible volume. One container $(I)$ has $2.8 g$ of $N_{2}$ at termperature $T_{1} (K)$ . The other container $(I I)$ is completely evacuated. The container $(I)$ is heated to $T_{2} (K)$ while ontainer $(I I)$ is maintained at $T_{2} / 3 (K)$ . volume of vessel $(I)$ is half that of vessel $(I I)$ . If the valve isopened then what is the weight ratio of $N_{2}$ in both vessel $(W_{I} / W_{I I})$ ?

Discussion

3.	The gaseous reaction: A(g)+nB(g)⇌mC(g) is represented by following curves. What is the value of n+m?
Answer» The gaseous reaction: $A (g) + n B (g) ⇌ m C (g)$ is represented by following curves. What is the value of $n + m$ ?

Discussion

4.	The orbital angular momentum of 3p electron is :
Answer» The orbital angular momentum of $3 p$ electron is :

Discussion

5.	Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?
Answer» Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?

Discussion

6.	Consider a reaction : N2+3H2⇌2NH3 Kp for the above reaction at 127∘C is 4.34×10−3 . ΔrH= −460.6 cal mol−1 . Estimate the temperature at which Kp will be 43.4×10−3
Answer» Consider a reaction : $N_{2} + 3 H_{2} ⇌ 2 N H_{3}$ $K_{p}$ for the above reaction at $127^{\circ} C$ is $4.34 \times 10^{- 3}$ . $Δ_{r} H =$ $- 460.6 c a l m o l^{- 1}$ . Estimate the temperature at which $K_{p}$ will be $43.4 \times 10^{- 3}$

Discussion

7.	A sample of four hydrogen atoms, all in the nth excited state, de- excite to the ground state, and shows a maximum of six different spectral lines. Hence the value of nth is:
Answer» A sample of four hydrogen atoms, all in the nth excited state, de- excite to the ground state, and shows a maximum of six different spectral lines. Hence the value of $n^{t h}$ is:

Discussion

8.	The initial pressure of a gas is 1 atm. To compress it to 1/4th of its initial volume, what will be the pressure required at constant temperature?
Answer» The initial pressure of a gas is $1 atm$ . To compress it to $1 / 4^{t h}$ of its initial volume, what will be the pressure required at constant temperature?

Discussion

9.	When a certain metal was irradiated with light of frequency 3.2×1016 Hz, the photoelectrons emitted had twice the kinetic energy as that of the photoelectrons emitted when the same metal was irradiated with light of frequency 2.0×1016 Hz. The value of ν∘ for the metal was found to be x×1016 Hz. Then x=
Answer» When a certain metal was irradiated with light of frequency $3.2 \times 10^{16} Hz$ , the photoelectrons emitted had twice the kinetic energy as that of the photoelectrons emitted when the same metal was irradiated with light of frequency $2.0 \times 10^{16} Hz .$ The value of $ν_{\circ}$ for the metal was found to be $x \times 10^{16} Hz$ . Then $x =$

Discussion

10.	A sample of air consisting of N2 and O2 was heated to 2500 K until the equilibrium N2 (g) + O2 (g) ⇌ 2NO (g) was established with an equilibrium constant Kc=2.1×10−3. At equilibrium, the mole % of NO was 1.8. Estimate the initial composition of air in mole fractions of N2 and O2.
Answer» A sample of air consisting of $N_{2}$ and $O_{2}$ was heated to 2500 K until the equilibrium $N_{2}$ (g) + $O_{2}$ (g) $⇌$ 2NO (g) was established with an equilibrium constant $K_{c} = 2.1 \times 10^{- 3}$ . At equilibrium, the mole $%$ of NO was 1.8. Estimate the initial composition of air in mole fractions of $N_{2}$ and $O_{2}$ .

Discussion

11.	Supposing the energy of fourth shell for H-atom is 50 a.u.(arbitrary unit) what would be its ionization potential?
Answer» Supposing the energy of fourth shell for H-atom is 50 a.u.(arbitrary unit) what would be its ionization potential?

Discussion

12.	pH of 0.1 molar monobasic acid is found to be 2. Hence its osmotic pressure at given temperature T is (T is in Kelvin scale)
Answer» pH of 0.1 molar monobasic acid is found to be 2. Hence its osmotic pressure at given temperature T is (T is in Kelvin scale)

Discussion

13.	How many grams of sugar is required to prepare 5% W/V sugar in 2 litre aqueous solution
Answer» How many grams of sugar is required to prepare 5% W/V sugar in 2 litre aqueous solution

Discussion

14.	Identify the incorrect statement among the following
Answer» Identify the incorrect statement among the following

Discussion

15.	Alcohols are comapratively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.
Answer» Alcohols are comapratively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

Discussion

16.	Of the possible structure of the molecular formula C5H11Br how many are optically active
Answer» Of the possible structure of the molecular formula C5H11Br how many are optically active

Discussion

17.	If the ionic radii of K+ and F− are 1.34∘ A each, the expected value of atomic radii of K and F should be:
Answer» If the ionic radii of $K^{+}$ and $F^{-}$ are $1.34 \circ A$ each, the expected value of atomic radii of $K$ and $F$ should be:

Discussion

18.	An advice is given by the government of India to all the pharmaceutical companies for the manufacture of a medicine having a concentration of 2700 ppb used for treating Covid-19 patients. The concentration of medicine in %(w/w) is:
Answer» An advice is given by the government of India to all the pharmaceutical companies for the manufacture of a medicine having a concentration of 2700 ppb used for treating Covid-19 patients. The concentration of medicine in %(w/w) is:

Discussion

19.	Electrons are emitted with zero velocity from a metal surface, when it is exposed to a radiation of wavelength 6800 Å . Then work function of metal is
Answer» Electrons are emitted with zero velocity from a metal surface, when it is exposed to a radiation of wavelength 6800 Å . Then work function of metal is

Discussion

20.	The pair of substances that have no hydrogen bonding is
Answer» The pair of substances that have no hydrogen bonding is

Discussion

21.	Out of the following which one gives Brown Ring Test?
Answer» Out of the following which one gives Brown Ring Test?

Discussion

22.	Equivalent weight of a aFeS2 is in the half reaction FeS2--->Fe2O3+SO2
Answer» Equivalent weight of a aFeS2 is in the half reaction FeS2--->Fe2O3+SO2

Discussion

23.	A copper atom has 29 electrons revolving around the nucleus. A copper ball contains 4x10^23 atoms. What fraction of electrons be removed to give the ball a charge of +9.6x10^-6 C?
Answer» A copper atom has 29 electrons revolving around the nucleus. A copper ball contains 4x10^23 atoms. What fraction of electrons be removed to give the ball a charge of +9.6x10^-6 C?

Discussion

24.	Is touching boiling hydrogen harmful? Will it have the same effect as touching boiling water?
Answer» Is touching boiling hydrogen harmful? Will it have the same effect as touching boiling water?

Discussion

25.	An electron has the kinetic energy 2.8×10−23J. De-Broglie wavelength will be nearly (me=9.1×10−31kg)
Answer» An electron has the kinetic energy $2.8 \times 10^{- 23} J$ . De-Broglie wavelength will be nearly $(m e = 9.1 \times 10^{- 31} k g)$

25.

An electron has the kinetic energy 2.8×10−23J. De-Broglie wavelength will be nearly (me=9.1×10−31kg)

Answer»

An electron has the kinetic energy $2.8 \times 10^{- 23} J$ . De-Broglie wavelength will be nearly

$(m e = 9.1 \times 10^{- 31} k g)$

Discussion

26.	Which of the following electronic configurations will have the highest electron affinity?
Answer» Which of the following electronic configurations will have the highest electron affinity?

Discussion

27.	The value of ΔH−ΔU for the following reaction at 37o C will be 2NH3(g)→N2(g)+3H2(g)
Answer» The value of $Δ H - Δ U$ for the following reaction at $37^{o}$ C will be $2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)$

Discussion

28.	Solute when dissolved in water:
Answer» Solute when dissolved in water:

Discussion

29.	Column 1, 2 and 3 contains starting material, formula of the product and structure of the product respectively. Column 1 Column 2 Column 3(I)NH4NO3Δ−→(i)H3PO3(P)Angular(II)White P4+alkali→(ii)N2O(Q)Tetrahedral(with one−OH)(III)Pb(NO3)2673K−−−→(iii)H3PO2(R)Tetrahedral(with two−OH)(IV)P2O3+H2O→(iv)N2O2(S)Linear The correct set in which phosphorous atom is in +3 state?
Answer» Column 1, 2 and 3 contains starting material, formula of the product and structure of the product respectively. $\begin{matrix} C o l u m n 1 & C o l u m n 2 & C o l u m n 3 (I) & N H_{4} N O_{3} Δ - \to & (i) & H_{3} P O_{3} & (P) & A n g u l a r (I I) & W h i t e P_{4} + a l k a l i \to & (i i) & N_{2} O & (Q) & T e t r a h e d r a l (w i t h o n e - O H) (I I I) & P b (N O_{3})_{2} 673 K - -- \to & (i i i) & H_{3} P O_{2} & (R) & T e t r a h e d r a l (w i t h t w o - O H) (I V) & P_{2} O_{3} + H_{2} O \to & (i v) & N_{2} O_{2} & (S) & L i n e a r \end{matrix}$ The correct set in which phosphorous atom is in +3 state?

Discussion

30.	What is the equation for Gibbs free energy
Answer» What is the equation for Gibbs free energy

Discussion

31.	Toulene reacts with Cl2 in the presence of Iron (III) chloride to produce
Answer» Toulene reacts with $C l_{2}$ in the presence of Iron (III) chloride to produce

Discussion

32.	Which of the following exhibits lowest boiling point?
Answer» Which of the following exhibits lowest boiling point?

Discussion

33.	Atoms A, B, C and D are present at corners, face centres, body centre and edge centres respectively. If atoms touching one of the 2-fold axis, 3-fold axis and 4-fold axis are removed, then total number of atoms remaining per unit cell is X+14 .The value of X is .
Answer» Atoms A, B, C and D are present at corners, face centres, body centre and edge centres respectively. If atoms touching one of the 2-fold axis, 3-fold axis and 4-fold axis are removed, then total number of atoms remaining per unit cell is $X + \frac{1}{4}$ .The value of X is .

Discussion

34.	The major product is
Answer» The major product is

Discussion

35.	If 100 calories of heat are added to a system and a work of 50 calories is done on the system, calculate the energy change of the system
Answer» If 100 calories of heat are added to a system and a work of 50 calories is done on the system, calculate the energy change of the system

Discussion

36.	A mixture of FeO and Fe3O4 when heated in air to a constant weight gains 5% of its weight. Find the composition of its initial mixture.
Answer» A mixture of FeO and Fe₃O₄ when heated in air to a constant weight gains 5% of its weight. Find the composition of its initial mixture.

Discussion

37.	Among the elements B Al, C and Si, (i) Whlich element has the highest first ionisation enthalpy? (ii) Which element has the mjost metallic cahracter? Justify your answer in each case.
Answer» Among the elements B Al, C and Si, (i) Whlich element has the highest first ionisation enthalpy? (ii) Which element has the mjost metallic cahracter? Justify your answer in each case.

37.

Among the elements B Al, C and Si, (i) Whlich element has the highest first ionisation enthalpy? (ii) Which element has the mjost metallic cahracter? Justify your answer in each case.

Answer»

Among the elements B Al, C and Si,
(i) Whlich element has the highest first ionisation enthalpy?

(ii) Which element has the mjost metallic cahracter? Justify your answer in each case.

Discussion

38.	The de Broglie wavelength of a sand grain weighing 2 mg blown by a wind of 10 m/s is:
Answer» The de Broglie wavelength of a sand grain weighing 2 mg blown by a wind of 10 m/s is:

Discussion

39.	Which of the following hydride is electron deficient?
Answer» Which of the following hydride is electron deficient?

Discussion

40.	When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.
Answer» When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.

Discussion

41.	In nitration reaction during the generation of nitronium ion, the role of sulphuric acid and Nitric acid are respectively
Answer» In nitration reaction during the generation of nitronium ion, the role of sulphuric acid and Nitric acid are respectively

Discussion

42.	In a fully turgid cell
Answer» In a fully turgid cell

Discussion

43.	Which of the following is 4-bromopent-2-ene?
Answer» Which of the following is 4-bromopent-2-ene?

43.

Which of the following is 4-bromopent-2-ene?

Answer»

Which of the following is 4-bromopent-2-ene?

Discussion

44.	IUPAC name of m-cresol is
Answer» IUPAC name of m-cresol is

Discussion

45.	2Cr(OH)3 + 3Na2O2 → A–– + 2NaOH + 2H2O A is.
Answer» $2 C r (O H)_{3} + 3 N a_{2} O_{2} \to A - - + 2 N a O H + 2 H_{2} O A$ is.

Discussion

46.	The most stable carbocation among the following, is: (correct answer +1, wrong answer -0.25)
Answer» The most stable carbocation among the following, is: (correct answer +1, wrong answer -0.25)

Discussion

47.	2BeCl2 + LiAlH4 → A–– + LiCl + AlCl3. A is
Answer» $2 B e C l_{2} + L i A l H_{4} \to A - - + L i C l + A l C l_{3}$ . $A$ is

Discussion

48.	A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at
Answer» A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at

Discussion

49.	The molar heat capacity of water in equilibrium with ice at constant pressure is
Answer» The molar heat capacity of water in equilibrium with ice at constant pressure is

Discussion

50.	The degree of dissociation (α) of a weak electrolyte, AxBy is related to van ’t Hoff factor (i), by the expression:
Answer» The degree of dissociation $(α)$ of a weak electrolyte, $A_{x} B_{y}$ is related to van ’t Hoff factor (i), by the expression:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is normality of a solution?

The gaseous reaction: A(g)+nB(g)⇌mC(g) is represented by following curves. What is the value of n+m?

The orbital angular momentum of 3p electron is :

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?

Consider a reaction : N2+3H2⇌2NH3 Kp for the above reaction at 127∘C is 4.34×10−3 . ΔrH= −460.6 cal mol−1 . Estimate the temperature at which Kp will be 43.4×10−3

A sample of four hydrogen atoms, all in the nth excited state, de- excite to the ground state, and shows a maximum of six different spectral lines. Hence the value of nth is:

The initial pressure of a gas is 1 atm. To compress it to 1/4th of its initial volume, what will be the pressure required at constant temperature?

A sample of air consisting of N2 and O2 was heated to 2500 K until the equilibrium N2 (g) + O2 (g) ⇌ 2NO (g) was established with an equilibrium constant Kc=2.1×10−3. At equilibrium, the mole % of NO was 1.8. Estimate the initial composition of air in mole fractions of N2 and O2.

Supposing the energy of fourth shell for H-atom is 50 a.u.(arbitrary unit) what would be its ionization potential?

pH of 0.1 molar monobasic acid is found to be 2. Hence its osmotic pressure at given temperature T is (T is in Kelvin scale)

How many grams of sugar is required to prepare 5% W/V sugar in 2 litre aqueous solution

Identify the incorrect statement among the following

Alcohols are comapratively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

Of the possible structure of the molecular formula C5H11Br how many are optically active

If the ionic radii of K+ and F− are 1.34∘ A each, the expected value of atomic radii of K and F should be:

An advice is given by the government of India to all the pharmaceutical companies for the manufacture of a medicine having a concentration of 2700 ppb used for treating Covid-19 patients. The concentration of medicine in %(w/w) is:

Electrons are emitted with zero velocity from a metal surface, when it is exposed to a radiation of wavelength 6800 Å . Then work function of metal is

The pair of substances that have no hydrogen bonding is

Out of the following which one gives Brown Ring Test?

Equivalent weight of a aFeS2 is in the half reaction FeS2--->Fe2O3+SO2

A copper atom has 29 electrons revolving around the nucleus. A copper ball contains 4x10^23 atoms. What fraction of electrons be removed to give the ball a charge of +9.6x10^-6 C?

Is touching boiling hydrogen harmful? Will it have the same effect as touching boiling water?

An electron has the kinetic energy 2.8×10−23J. De-Broglie wavelength will be nearly (me=9.1×10−31kg)

Which of the following electronic configurations will have the highest electron affinity?

The value of ΔH−ΔU for the following reaction at 37o C will be 2NH3(g)→N2(g)+3H2(g)

Solute when dissolved in water:

What is the equation for Gibbs free energy

Toulene reacts with Cl2 in the presence of Iron (III) chloride to produce

Which of the following exhibits lowest boiling point?

Atoms A, B, C and D are present at corners, face centres, body centre and edge centres respectively. If atoms touching one of the 2-fold axis, 3-fold axis and 4-fold axis are removed, then total number of atoms remaining per unit cell is X+14 .The value of X is .

The major product is

If 100 calories of heat are added to a system and a work of 50 calories is done on the system, calculate the energy change of the system

A mixture of FeO and Fe3O4 when heated in air to a constant weight gains 5% of its weight. Find the composition of its initial mixture.

Among the elements B Al, C and Si, (i) Whlich element has the highest first ionisation enthalpy? (ii) Which element has the mjost metallic cahracter? Justify your answer in each case.

The de Broglie wavelength of a sand grain weighing 2 mg blown by a wind of 10 m/s is:

Which of the following hydride is electron deficient?

When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.

In nitration reaction during the generation of nitronium ion, the role of sulphuric acid and Nitric acid are respectively

In a fully turgid cell

Which of the following is 4-bromopent-2-ene?

IUPAC name of m-cresol is

2Cr(OH)3 + 3Na2O2 → A–– + 2NaOH + 2H2O A is.

The most stable carbocation among the following, is: (correct answer +1, wrong answer -0.25)

2BeCl2 + LiAlH4 → A–– + LiCl + AlCl3. A is

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at

The molar heat capacity of water in equilibrium with ice at constant pressure is

The degree of dissociation (α) of a weak electrolyte, AxBy is related to van ’t Hoff factor (i), by the expression: