46295 + Interview Questions in Chemistry

1.	Milk changes after digestion into:
Answer» Milk changes after digestion into:

Discussion

2.	The concentration of K+ ion inside a biological cell is 20 times higher than outside. The magnitude of potential difference between the two sides is : [Given:2.303RTF=59 mV]
Answer» The concentration of $K^{+}$ ion inside a biological cell is $20$ times higher than outside. The magnitude of potential difference between the two sides is : $[G i v e n : 2.303 \frac{R T}{F} = 59 m V]$

Discussion

3.	Find the product 'X' in the given reaction : CH4+H2ONi−−−−−−→△(1273 K)X+3H2
Answer» Find the product 'X' in the given reaction : $C H_{4} + H_{2} O N i - ----- \to △ (1273 K) X + 3 H_{2}$

Discussion

4.	Find the order of reactivity of labelled hydrogen with NaNH2.
Answer» Find the order of reactivity of labelled hydrogen with $N a N H_{2}$ .

Discussion

5.	Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 ˚A.
Answer» Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 $˚ A$ .

Discussion

6.	In the ellingham diagram there is. Sudden increase in the slope towards the positive side.But logically it should increase towards the negative side as entropy increases.COULD SOMEONE CLEAR MY DOUBTS, PLEASE,SIR/ MAMMA?
Answer» In the ellingham diagram there is. Sudden increase in the slope towards the positive side.But logically it should increase towards the negative side as entropy increases.COULD SOMEONE CLEAR MY DOUBTS, PLEASE,SIR/ MAMMA?

Discussion

7.	Uncertainity in position of a hypothetical subatomic particle is 1Å and uncertainty in velocity is 3.34π × 105 m/s then the mass of the particle is approximately [h = 6.6 × 10−34 Js]
Answer» Uncertainity in position of a hypothetical subatomic particle is $1 Å$ and uncertainty in velocity is $\frac{3.3}{4 π} \times 10^{5} m / s$ then the mass of the particle is approximately $[h = 6.6 \times 10^{- 34} J s]$

Discussion

8.	Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy change ( in kJ) for the process is
Answer» Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy change ( in kJ) for the process is

Discussion

9.	Difference between sp3 and sp2 hybridisation
Answer» Difference between sp³ and sp^{2 _{hybridisation}}

Discussion

10.	In weak alkaline medium KMnO4 converted in to?
Answer» In weak alkaline medium KMnO₄ converted in to?

Discussion

11.	What is the basic theme of organisation in the periodic table?
Answer» What is the basic theme of organisation in the periodic table?

Discussion

12.	A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of N2:O2 is 3 : 1. Find the partial pressure of nitrogen in the sample.
Answer» A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of $N_{2} : O_{2}$ is 3 : 1. Find the partial pressure of nitrogen in the sample.

Discussion

13.	50% X on electrolysis at 0∘C gives Y; 'Y' on distillation gives H2O2. Then number of peroxy bonds in X and Y are
Answer» 50% X on electrolysis at $0^{\circ}$ C gives Y; 'Y' on distillation gives $H_{2}$ $O_{2}$ . Then number of peroxy bonds in X and Y are

Discussion

14.	The order of dipole moment of the above molecules is
Answer» The order of dipole moment of the above molecules is

Discussion

15.	Which of the typical intermediate is sp hybridised?
Answer» Which of the typical intermediate is sp hybridised?

Discussion

16.	When aryl halide is heated with 6-8% NaOH solution ,at 623 K under 300 atm pressure we get:
Answer» When aryl halide is heated with 6-8% NaOH solution ,at 623 K under 300 atm pressure we get:

Discussion

17.	Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided in how many categories?
Answer» Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided in how many categories?

Discussion

18.	Sodium acts as as a strong reducing agent. Which of the following reaction/ reactions exemplifies this behaviour.
Answer» Sodium acts as as a strong reducing agent. Which of the following reaction/ reactions exemplifies this behaviour.

Discussion

19.	Which of the following carbonyls will have the strongest C - O bond?
Answer» Which of the following carbonyls will have the strongest C - O bond?

Discussion

20.	Which of the following gaseous molecule is monoatomic?
Answer» Which of the following gaseous molecule is monoatomic?

Discussion

21.	If any reversible reactions takes place in a closed system, equilibrium ___________
Answer» If any reversible reactions takes place in a closed system, equilibrium ___________

Discussion

22.	An aqueous solution of metal ion (X) reacts seperately with reagents A and B in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion (Y) always form tetrahedral complexes with these reagents and on reaction with small amount of C reagent gives precipitate which dissolves in excess of C. Reagent C is:
Answer» An aqueous solution of metal ion (X) reacts seperately with reagents A and B in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion (Y) always form tetrahedral complexes with these reagents and on reaction with small amount of C reagent gives precipitate which dissolves in excess of C. Reagent C is:

Discussion

23.	Which of the following complex ions will not show optical activity?
Answer» Which of the following complex ions will not show optical activity?

Discussion

24.	If there is no rotation of plane-polarized light by a compound in a specific solvent, thought to be chiral, it may mean that
Answer» If there is no rotation of plane-polarized light by a compound in a specific solvent, thought to be chiral, it may mean that

Discussion

25.	The incorrect IUPAC name is
Answer» The incorrect IUPAC name is

Discussion

26.	Buna – S is obtained when 1, 3, - butadiene adds to : -
Answer» Buna – S is obtained when 1, 3, - butadiene adds to : -

Discussion

27.	A 4 M, 500 mL aqueous solution containing M1+ is made to react with 1 M, 1 L HNO3. As a result, some of M1+ is converted into Mx+ and all HNO3 into NO(g). After the reaction concentration of Mx+ ions becomes 13M value of X is:
Answer» A $4 M$ , $500 m L$ aqueous solution containing $M^{1 +}$ is made to react with $1 M, 1 L$ $H N O_{3} .$ As a result, some of $M^{1 +}$ is converted into $M^{x +}$ and all $H N O_{3}$ into NO(g). After the reaction concentration of $M^{x +}$ ions becomes $\frac{1}{3} M$ value of X is:

Discussion

28.	The decay constant of 19780Hg (electron capture to 19779Au) is 1.8 ×10−4 S−1. (a) What is the half-life ? (b) What is the average - life ? (c) How much time will it take to convert 25% of this isotope of mercury into gold ?
Answer» The decay constant of $_{80}^{197} Hg$ (electron capture to $_{79}^{197} Au$ ) is 1.8 $\times 10^{- 4} S^{- 1}$ . (a) What is the half-life ? (b) What is the average - life ? (c) How much time will it take to convert $25 %$ of this isotope of mercury into gold ?

Discussion

29.	The enantiomeric excess of a racemic mixture is ___?
Answer» The enantiomeric excess of a racemic mixture is ___?

Discussion

30.	A cylinders with a movable piston contains 3 moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of heat insulator, and the piston is insulated by having a pile of sand on it/ By what factor does the pressure of the gas increase, if the gas is compressed to half it original volume?
Answer» A cylinders with a movable piston contains 3 moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of heat insulator, and the piston is insulated by having a pile of sand on it/ By what factor does the pressure of the gas increase, if the gas is compressed to half it original volume?

Discussion

31.	Which of the following is not hypovalent but complete its octet?
Answer» Which of the following is not hypovalent but complete its octet?

Discussion

32.	The equilibrium constants Kp1 and Kp2 for the reactions X⇌2Y and Z⇌P+Q, respectively are in the ratio of 1:9. If degree of dissociation of X and Z be equal then the ratio if total pressures at these equlibria is
Answer» The equilibrium constants $K_{p 1}$ and $K_{p 2}$ for the reactions $X ⇌ 2 Y$ and $Z ⇌ P + Q$ , respectively are in the ratio of $1 : 9$ . If degree of dissociation of $X$ and $Z$ be equal then the ratio if total pressures at these equlibria is

Discussion

33.	One mole of monoatomic gas is at pressure p0 and volume V0, the adiabatic compressibility of gas is given by
Answer» One mole of monoatomic gas is at pressure p₀ and volume V₀, the adiabatic compressibility of gas is given by

Discussion

34.	Which one of the following exist in aqueous medium? M=Aluminium
Answer» Which one of the following exist in aqueous medium? M=Aluminium

Discussion

35.	Which of the following orders is incorrect about electron affinity?
Answer» Which of the following orders is incorrect about electron affinity?

Discussion

36.	For hydrogen gas, Cp−Cv = a and for nitrogen gas Cp−Cv = b, then the relation between a and b is: (where Cp and Cv are specific heats defined per gram)
Answer» For hydrogen gas, $C_{p} - C_{v}$ = a and for nitrogen gas $C_{p} - C_{v}$ = b, then the relation between a and b is: (where $C_{p}$ and $C_{v}$ are specific heats defined per gram)

Discussion

37.	Find the total number of planar molecules among the following. CO2−3, .CH3, .CF3, BeCl2, B2H6, H3PO2, SO3, BF3, XeF4
Answer» Find the total number of planar molecules among the following. $C O_{3}^{2 -}, . C H_{3}, . C F_{3}, B e C l_{2}, B_{2} H_{6}, H_{3} P O_{2}, S O_{3}, B F_{3}, X e F_{4}$

Discussion

38.	How many molecules are planar from the following molecules? I−3, H2O, ICl−2, C2H4, C2H2, H3O+ ___
Answer» How many molecules are planar from the following molecules? $I_{3}^{-}, H_{2} O, I C l_{2}^{-}, C_{2} H_{4}, C_{2} H_{2}, H_{3} O^{+}$ ___

Discussion

39.	Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to test tube A, while acetic acid is added to test tube B. Amount and concentration of both the acids is same. In which test tube will the fizzing occur more vigorously and why?
Answer» Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to test tube A, while acetic acid is added to test tube B. Amount and concentration of both the acids is same. In which test tube will the fizzing occur more vigorously and why?

Discussion

40.	(a) Write the reactions involved in the following: (i) Hoffmann bromamide degradation reaction (ii) Diazotisation (iii) Gabriel phthalimide synthesis (b) Give reasons : (i) (CH3)2NH is more basic than (CH3)3N in an aqueous solution. (ii) Aromatic diazonium salts are more stable than aliphatic diazonium salts.
Answer» (a) Write the reactions involved in the following: (i) Hoffmann bromamide degradation reaction (ii) Diazotisation (iii) Gabriel phthalimide synthesis (b) Give reasons : (i) $(C H_{3})_{2} N H$ is more basic than $(C H_{3})_{3} N$ in an aqueous solution. (ii) Aromatic diazonium salts are more stable than aliphatic diazonium salts.

Discussion

41.	25.3 g of sodium carbonate is dissolved in enough water to make 250 ml of solution. If sodium carbonate dissociates completely, then what is the molar concentration of sodium ions and carbonate ions?
Answer» 25.3 g of sodium carbonate is dissolved in enough water to make 250 ml of solution. If sodium carbonate dissociates completely, then what is the molar concentration of sodium ions and carbonate ions?

Discussion

42.	The products (A) and (B) are respectively:
Answer» The products (A) and (B) are respectively:

Discussion

43.	Most stable product is formed by haemoglobin with
Answer» Most stable product is formed by haemoglobin with

Discussion

44.	What leads to close packing?
Answer» What leads to close packing?

44.

What leads to close packing?

Answer»

What leads to close packing?

Discussion

45.	What is the mixture of MgCl2 and MgO is called?
Answer» What is the mixture of MgCl₂ and MgO is called?

Discussion

46.	When energy is supplied to an atom, the electrons of the atom move to higher energy orbits depending on the amount of energy absorbed. When these electrons return to any of the lower energy orbits, they emit energy. Depending on whether the electrons return to the 1st, 2nd, 3rd, 4th or 5th orbits, the series formed are called Lyman, Balmer, Paschen, Brackett and Pfund series respectively. If the electron comes back from the energy level E2 to the energy level E1, then the difference may be expressed in terms of the energy of photon as E2−E1=ΔE, λ=hcΔE Thus each transition from one energy level to another will produce a light of definite wavelength. This is observed as a line in the spectrum of the hydrogen atom. Wave number of the line is given by the formula −ν=RZ2(1n21−1n22) Where R=1.097×105 cm−1 is Rydberg constant. List - IList - II(I) If the ionisation potential for hydrogen-like atom(P) 5.48×10−32cR Jin a sample is 122.0 eV, then the energy of the lastline of Paschen series for this atom is:(II) In a single isolated atom, an electron makes (Q) 6.6×10−32cR Jtransition from fifth excited state such that no spectral lines are observed in the visible range then maximum number of different types of photons observed is:(III) The difference in energy of the second line(R) 6of Lyman series and last line of Brackett series in ahydrogen sample is:(IV) The energy of the electromagnetic radiation(S) 4emitted during the transition of electron in betweenthe two levels of Li2+ ion whose principal quantumnumber sum is 4 and difference is 2 is:(T) 6.6×10−34cR J(U) 0.53×10−30cR J Which of the following options has the correct combination considering List-I and List-II?
Answer» When energy is supplied to an atom, the electrons of the atom move to higher energy orbits depending on the amount of energy absorbed. When these electrons return to any of the lower energy orbits, they emit energy. Depending on whether the electrons return to the 1st, 2nd, 3rd, 4th or 5th orbits, the series formed are called Lyman, Balmer, Paschen, Brackett and Pfund series respectively. If the electron comes back from the energy level $E_{2}$ to the energy level $E_{1}$ , then the difference may be expressed in terms of the energy of photon as $E_{2} - E_{1} = Δ E$ , $λ = \frac{h c}{Δ E}$ Thus each transition from one energy level to another will produce a light of definite wavelength. This is observed as a line in the spectrum of the hydrogen atom. Wave number of the line is given by the formula $- ν = R Z^{2} (\frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}})$ Where $R = 1.097 \times 10^{5} c m^{- 1}$ is Rydberg constant. $\begin{matrix} List - I & List - II (I) If the ionisation potential for hydrogen-like atom & (P) 5.48 \times 10^{- 32} c R J in a sample is 122.0 e V, then the energy of the last line of Paschen series for this atom is: (II) In a single isolated atom, an electron makes & (Q) 6.6 \times 10^{- 32} c R J transition from fifth excited state such that no spectral lines are observed in the visible range then maximum number of different types of photons observed is: (III) The difference in energy of the second line & (R) 6 of Lyman series and last line of Brackett series in a hydrogen sample is: (IV) The energy of the electromagnetic radiation & (S) 4 emitted during the transition of electron in between the two levels of L i^{2 +} ion whose principal quantum number sum is 4 and difference is 2 is: (T) 6.6 \times 10^{- 34} c R J (U) 0.53 \times 10^{- 30} c R J \end{matrix}$ Which of the following options has the correct combination considering List-I and List-II?

Discussion

47.	Which of the following is soluble in alcohol.
Answer» Which of the following is soluble in alcohol.

Discussion

48.	An open flask contains air at 27c . To what temperature it must be heated to expel one - fourth of the volume . In this question can I use the Charles law as v/T = constant . If not then why ?
Answer» An open flask contains air at 27c . To what temperature it must be heated to expel one - fourth of the volume . In this question can I use the Charles law as v/T = constant . If not then why ?

Discussion

49.	Explain law of multiple proportion? With examples
Answer» Explain law of multiple proportion? With examples

49.

Explain law of multiple proportion? With examples

Answer»

Explain law of multiple proportion?

With examples

Discussion

50.	KCl crystallizes in the same type of lattice as does NaCl.Given that radius ratio of Na by Cl is 0.5 and radius of Na by K is 0.7. Calculate the ratios of the sides of unit cell for KCl to that for NaCl and the ratio of densities of NaCl to that for KCl.
Answer» KCl crystallizes in the same type of lattice as does NaCl.Given that radius ratio of Na by Cl is 0.5 and radius of Na by K is 0.7. Calculate the ratios of the sides of unit cell for KCl to that for NaCl and the ratio of densities of NaCl to that for KCl.

50.

KCl crystallizes in the same type of lattice as does NaCl.Given that radius ratio of Na by Cl is 0.5 and radius of Na by K is 0.7. Calculate the ratios of the sides of unit cell for KCl to that for NaCl and the ratio of densities of NaCl to that for KCl.

Answer»

KCl crystallizes in the same type of lattice as does NaCl.Given that radius ratio of Na by Cl is 0.5 and radius of Na by K is 0.7.

Calculate the ratios of the sides of unit cell for KCl to that for NaCl and the ratio of densities of NaCl to that for KCl.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Milk changes after digestion into:

The concentration of K+ ion inside a biological cell is 20 times higher than outside. The magnitude of potential difference between the two sides is : [Given:2.303RTF=59 mV]

Find the product 'X' in the given reaction : CH4+H2ONi−−−−−−→△(1273 K)X+3H2

Find the order of reactivity of labelled hydrogen with NaNH2.

Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 ˚A.

In the ellingham diagram there is. Sudden increase in the slope towards the positive side.But logically it should increase towards the negative side as entropy increases.COULD SOMEONE CLEAR MY DOUBTS, PLEASE,SIR/ MAMMA?

Uncertainity in position of a hypothetical subatomic particle is 1Å and uncertainty in velocity is 3.34π × 105 m/s then the mass of the particle is approximately [h = 6.6 × 10−34 Js]

Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The enthalpy change ( in kJ) for the process is

Difference between sp​​​​​3​​​​ and sp​​​​​2 hybridisation

In weak alkaline medium KMnO4 converted in to?

What is the basic theme of organisation in the periodic table?

A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of N2:O2 is 3 : 1. Find the partial pressure of nitrogen in the sample.

50% X on electrolysis at 0∘C gives Y; 'Y' on distillation gives H2O2. Then number of peroxy bonds in X and Y are

The order of dipole moment of the above molecules is

Which of the typical intermediate is sp hybridised?

When aryl halide is heated with 6-8% NaOH solution ,at 623 K under 300 atm pressure we get:

Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided in how many categories?

Sodium acts as as a strong reducing agent. Which of the following reaction/ reactions exemplifies this behaviour.

Which of the following carbonyls will have the strongest C - O bond?

Which of the following gaseous molecule is monoatomic?

If any reversible reactions takes place in a closed system, equilibrium ___________

Which of the following complex ions will not show optical activity?

If there is no rotation of plane-polarized light by a compound in a specific solvent, thought to be chiral, it may mean that

The incorrect IUPAC name is

Buna – S is obtained when 1, 3, - butadiene adds to : -

A 4 M, 500 mL aqueous solution containing M1+ is made to react with 1 M, 1 L HNO3. As a result, some of M1+ is converted into Mx+ and all HNO3 into NO(g). After the reaction concentration of Mx+ ions becomes 13M value of X is:

The decay constant of 19780Hg (electron capture to 19779Au) is 1.8 ×10−4 S−1. (a) What is the half-life ? (b) What is the average - life ? (c) How much time will it take to convert 25% of this isotope of mercury into gold ?

The enantiomeric excess of a racemic mixture is ___?

Which of the following is not hypovalent but complete its octet?

The equilibrium constants Kp1 and Kp2 for the reactions X⇌2Y and Z⇌P+Q, respectively are in the ratio of 1:9. If degree of dissociation of X and Z be equal then the ratio if total pressures at these equlibria is

One mole of monoatomic gas is at pressure p0 and volume V0, the adiabatic compressibility of gas is given by

Which one of the following exist in aqueous medium? M=Aluminium

Which of the following orders is incorrect about electron affinity?

For hydrogen gas, Cp−Cv = a and for nitrogen gas Cp−Cv = b, then the relation between a and b is: (where Cp and Cv are specific heats defined per gram)

Find the total number of planar molecules among the following. CO2−3, .CH3, .CF3, BeCl2, B2H6, H3PO2, SO3, BF3, XeF4

How many molecules are planar from the following molecules? I−3, H2O, ICl−2, C2H4, C2H2, H3O+ ___

Equal lengths of magnesium ribbons are taken in test tubes A and B. HCl is added to test tube A, while acetic acid is added to test tube B. Amount and concentration of both the acids is same. In which test tube will the fizzing occur more vigorously and why?

25.3 g of sodium carbonate is dissolved in enough water to make 250 ml of solution. If sodium carbonate dissociates completely, then what is the molar concentration of sodium ions and carbonate ions?

The products (A) and (B) are respectively:

Most stable product is formed by haemoglobin with

What leads to close packing?

What is the mixture of MgCl2 and MgO is called?

Which of the following is soluble in alcohol.

An open flask contains air at 27c . To what temperature it must be heated to expel one - fourth of the volume . In this question can I use the Charles law as v/T = constant . If not then why ?

Explain law of multiple proportion? With examples

KCl crystallizes in the same type of lattice as does NaCl.Given that ​​​​​​radius ratio of Na by Cl is 0.5 and radius of Na by K is 0.7. Calculate the ratios of the sides of unit cell for KCl to that for NaCl and the ratio of densities of NaCl to that for KCl.

Difference between sp3 and sp2 hybridisation

KCl crystallizes in the same type of lattice as does NaCl.Given that radius ratio of Na by Cl is 0.5 and radius of Na by K is 0.7. Calculate the ratios of the sides of unit cell for KCl to that for NaCl and the ratio of densities of NaCl to that for KCl.