46295 + Interview Questions in Chemistry

1.	Prove that the instantaneous rate of change of activity of a radioactive substance is inversely proportional to the square of its half life
Answer» Prove that the instantaneous rate of change of activity of a radioactive substance is inversely proportional to the square of its half life

Discussion

2.	The controversy is likely to create ___________ between the two societies.
Answer» The controversy is likely to create ___________ between the two societies.

Discussion

3.	The process of eudiometry is used to calculate the volume of the various reacting gases present together in a closed vessel, it is done by sparking the content and noting the volume change or pressure change depending upon the conditions mentioned. Various reagents like alkaline pyrogallol, turpentine oil, caustic potash, conc. H2SO4 are used to absorb the selective gases like O2,O3,CO2 and H2O(v) respectively. A 2.0 mole mixture of H2(g),O2(g) and He(g) are placed together in a closed container at pressure equal to 50 atm. An electric spark is passed and pressure is noted as 12.5 atm after cooling the content to original temperature (room temp). Oxygen gas is introduced for pressure to change to 25 atm, keeping volume and temperature constant. Again electrical spark is passed and pressure drops to 10 atm under original temperature conditions. The moles of He(g) present in the mixture sample is:
Answer» The process of eudiometry is used to calculate the volume of the various reacting gases present together in a closed vessel, it is done by sparking the content and noting the volume change or pressure change depending upon the conditions mentioned. Various reagents like alkaline pyrogallol, turpentine oil, caustic potash, conc. $H_{2} S O_{4}$ are used to absorb the selective gases like $O_{2}, O_{3}, C O_{2} and H_{2} O (v)$ respectively. A $2.0$ mole mixture of $H_{2} (g), O_{2} (g) and H e (g)$ are placed together in a closed container at pressure equal to $50 atm$ . An electric spark is passed and pressure is noted as $12.5 atm$ after cooling the content to original temperature (room temp). Oxygen gas is introduced for pressure to change to $25 atm$ , keeping volume and temperature constant. Again electrical spark is passed and pressure drops to $10 atm$ under original temperature conditions. The moles of $H e (g)$ present in the mixture sample is:

Discussion

4.	If we have a pure MgCO3 sample that contains a total of 1.26 millimoles of electrons, the number of moles of MgCO3 present in the sample is x×10−5, x is.
Answer» If we have a pure $M g C O_{3}$ sample that contains a total of 1.26 millimoles of electrons, the number of moles of $M g C O_{3}$ present in the sample is $x \times 10^{- 5}$ , x is.

Discussion

5.	An atom typically exists in an excited state for about Δt=10−8 s. Estimate the uncertainity in frequency Δν in the frequency of emitted photons when an atom makes a transition from an excited state with the simultaneous emission of a photon with an average frequency of νav = 7.1×1014 Hz. Calculate the ratio of uncertainity in frequency to the average frequency.
Answer» An atom typically exists in an excited state for about $Δ t = 10^{- 8}$ s. Estimate the uncertainity in frequency $Δ ν$ in the frequency of emitted photons when an atom makes a transition from an excited state with the simultaneous emission of a photon with an average frequency of $ν_{a v}$ = $7.1 \times 10^{14}$ Hz. Calculate the ratio of uncertainity in frequency to the average frequency.

Discussion

6.	Equal volumes of 10%vv of HCl is mixed with 10%vv NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be
Answer» Equal volumes of 10% $\frac{v}{v}$ of HCl is mixed with 10% $\frac{v}{v}$ NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

Discussion

7.	As ethers are not functional groups but in NCERT it is given that 'ethers are the least reactive of the functional groups' ( page 339) please explain?
Answer» As ethers are not functional groups but in NCERT it is given that 'ethers are the least reactive of the functional groups' ( page 339) please explain?

Discussion

8.	A = {1, 2, 3, 4, 5} and B = {2, 3, 7} So A - B=?
Answer» A = {1, 2, 3, 4, 5} and B = {2, 3, 7} So A - B=?

Discussion

9.	Pick up the final product in the following reaction. Product is
Answer» Pick up the final product in the following reaction. Product is

9.

Pick up the final product in the following reaction. Product is

Answer»

Pick up the final product in the following reaction.

Product is

Discussion

10.	ClO2+SbO−2→ClO−2+Sb(OH)−6 The balanced form of the above reaction in basic medium using oxidation number method is:
Answer» $C l O_{2} + S b O_{2}^{-} \to C l O_{2}^{-} + S b (O H)_{6}^{-}$ The balanced form of the above reaction in basic medium using oxidation number method is:

Discussion

11.	A mark is made on the bottom of a vessel, over this mark a glass slab of thickness 3.5 cm and refractive index 7/4 is placed. Now water (refractive index 4/3) is poured into the vessel so that the surface of water is 8 cm above the upper surface of the slab. Looking down normally through the water, the apparent depth of the mark below the surface of water will be
Answer» A mark is made on the bottom of a vessel, over this mark a glass slab of thickness 3.5 cm and refractive index 7/4 is placed. Now water (refractive index 4/3) is poured into the vessel so that the surface of water is 8 cm above the upper surface of the slab. Looking down normally through the water, the apparent depth of the mark below the surface of water will be

Discussion

12.	(a) State Raoult's law for a solution containing volatile components. How does Raoult's law become a special cause of Henry's law ? . (b) 1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. Find the molar mass of the solute. (Kf for benzene = 5.12K kg mol−1)
Answer» (a) State Raoult's law for a solution containing volatile components. How does Raoult's law become a special cause of Henry's law ? . (b) 1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. Find the molar mass of the solute. ( $K_{f}$ for benzene = $5.12 K k g m o l^{- 1})$

Discussion

13.	50 mL of a mixture of NaOH and Na2CO3titrated withN10 HCl using phenolphthalein indicator required 50ml of HCl to decolorize phenolphthalein. At this stage, methyl orange was added and the addition of acid was continued.The second endpoint was reached after further addition of 10 ml of N10 HCl.The amount of NaOH in the solution is:
Answer» 50 mL of a mixture of NaOH and $N a_{2} C O_{3}$ titrated with $\frac{N}{10} H C l$ using phenolphthalein indicator required 50ml of $H C l$ to decolorize phenolphthalein. At this stage, methyl orange was added and the addition of acid was continued. The second endpoint was reached after further addition of 10 ml of $\frac{N}{10} H C l$ . The amount of NaOH in the solution is:

13.

50 mL of a mixture of NaOH and Na2CO3titrated withN10 HCl using phenolphthalein indicator required 50ml of HCl to decolorize phenolphthalein. At this stage, methyl orange was added and the addition of acid was continued.The second endpoint was reached after further addition of 10 ml of N10 HCl.The amount of NaOH in the solution is:

Answer»

50 mL of a mixture of NaOH and $N a_{2} C O_{3}$ titrated with $\frac{N}{10} H C l$ using phenolphthalein indicator required 50ml of $H C l$ to decolorize phenolphthalein. At this stage, methyl orange was added and the addition of acid was continued.

The second endpoint was reached after further addition of 10 ml of $\frac{N}{10} H C l$ .

The amount of NaOH in the solution is:

Discussion

14.	For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, pick the correct option:
Answer» For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, pick the correct option:

Discussion

15.	300 ml of a gas at 27∘ C is cooled to - 3∘ C at constant pressure, the final volume is ?
Answer» 300 ml of a gas at $27^{\circ}$ C is cooled to - $3^{\circ}$ C at constant pressure, the final volume is ?

Discussion

16.	Kf for water is 1.86Kkg/molal. Therefore the freezing point of 0.1M NaCl solution is:
Answer» K_f for water is 1.86Kkg/molal. Therefore the freezing point of 0.1M NaCl solution is:

Discussion

17.	What is the maximum oxidation state shown by actinides?
Answer» What is the maximum oxidation state shown by actinides?

Discussion

18.	The Cannizzaro’s reaction is not given by
Answer» The Cannizzaro’s reaction is not given by

Discussion

19.	2.0 g of charcoal is placed in a 100 mL solution of 0.05 M CH3COOH to form an adsorbed monoacidic layer of acetic acid molecules and thereby the molarity of CH3COOH reduces to 0.49 M. The surface area of charcoal is 3×102 m2g−1. The surface area of charcoal used by each molecule of acetic acid is:
Answer» $2.0 g$ of charcoal is placed in a $100 mL$ solution of $0.05 M C H_{3} C O O H$ to form an adsorbed monoacidic layer of acetic acid molecules and thereby the molarity of $C H_{3} C O O H$ reduces to $0.49 M$ . The surface area of charcoal is $3 \times 10^{2} m^{2} g^{- 1}$ . The surface area of charcoal used by each molecule of acetic acid is:

Discussion

20.	Which one of the following aqueous solutions will exhibit highest boiling point ?
Answer» Which one of the following aqueous solutions will exhibit highest boiling point ?

Discussion

21.	On the basis of LCAO-MO theory, the magnetic characteristics of N2 and N+2 are
Answer» On the basis of LCAO-MO theory, the magnetic characteristics of $N_{2}$ and $N_{2}^{+}$ are

Discussion

22.	Number of π electrons present in naphthalene is
Answer» Number of $π$ electrons present in naphthalene is

Discussion

23.	The energy of an electron present in Bohr’s second orbit of hydrogen atom is
Answer» The energy of an electron present in Bohr’s second orbit of hydrogen atom is

Discussion

24.	At 25oC, the free energy of formation of H2O(l) is −61076 cal/mol. The free energy of ionisation of water to H+ and OH− is 19050 cal/mol. The reversible EMF (in V) of the following cell at 25oC is: H2(g)(1 atm)\|H+\|\|O2(g)(1 atm)\|OH−
Answer» At $25^{o} C$ , the free energy of formation of $H_{2} O (l)$ is $- 61076 c a l / m o l$ . The free energy of ionisation of water to $H^{+}$ and $O H^{-}$ is $19050 c a l / m o l$ . The reversible EMF (in V) of the following cell at $25^{o} C$ is: $H_{2} (g) (1 a t m) \| H^{+} \| \| O_{2} (g) (1 a t m) \| O H^{-}$

Discussion

25.	Which of the following compounds is an optically active compound
Answer» Which of the following compounds is an optically active compound

Discussion

26.	After adding a non volatile solute, freezing point of solution decreases to - 0.186. Calculate
Answer» After adding a non volatile solute, freezing point of solution decreases to - 0.186. Calculate

Discussion

27.	Mention four important causes of environmental degradation.
Answer» Mention four important causes of environmental degradation.

Discussion

28.	Calculate wavelength, frequency wave number of light whose period is 2×10−10 second.
Answer» Calculate wavelength, frequency wave number of light whose period is $2 \times 10^{- 10}$ second.

Discussion

29.	Which of the following statements indicates that law of multiple proportion is being followed ? (a) Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2 (b) Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 : 1 (c) When magnesium burns in oxygen, the amount of magnesium taken for the reactoin is equal to the amount of magnesium in magnesium oxide formed (d) At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour
Answer» Which of the following statements indicates that law of multiple proportion is being followed ? (a) Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2 (b) Carbon forms two oxides namely $C O_{2}$ and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 : 1 (c) When magnesium burns in oxygen, the amount of magnesium taken for the reactoin is equal to the amount of magnesium in magnesium oxide formed (d) At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour

29.

Which of the following statements indicates that law of multiple proportion is being followed ? (a) Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2 (b) Carbon forms two oxides namely CO2 and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 : 1 (c) When magnesium burns in oxygen, the amount of magnesium taken for the reactoin is equal to the amount of magnesium in magnesium oxide formed (d) At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour

Answer»

Which of the following statements indicates that law of multiple proportion is being followed ?

(a) Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2

(b) Carbon forms two oxides namely $C O_{2}$ and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 : 1

(c) When magnesium burns in oxygen, the amount of magnesium taken for the reactoin is equal to the amount of magnesium in magnesium oxide formed

(d) At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour

Discussion

30.	Which of the following can be a conjugate system ?
Answer» Which of the following can be a conjugate system ?

Discussion

31.	Arrange the following in the decreasing order of basicity:
Answer» Arrange the following in the decreasing order of basicity:

31.

Arrange the following in the decreasing order of basicity:

Answer»

Arrange the following in the decreasing order of basicity:

Discussion

32.	Consider the following reactions, which are carried out at the same temperature. CH3−Br+OH⊕EtOH−−−→CH3−OH+Br⊖ ⋯(i)CH3−Br+OH⊕DMSO−−−−→CH3−OH+Br⊖ ⋯(ii) Which of the following statement is correct about these reactions?
Answer» Consider the following reactions, which are carried out at the same temperature. $C H_{3} - B r + O H^{\oplus} E t O H - -- \to C H_{3} - O H + B r^{⊖} \dots (i) C H_{3} - B r + O H^{\oplus} D M S O - --- \to C H_{3} - O H + B r^{⊖} \dots (i i)$ Which of the following statement is correct about these reactions?

Discussion

33.	IUPAC name of (CH3)2CH - N(CH3)2 is
Answer» IUPAC name of (CH₃)₂CH - N(CH₃)₂is

Discussion

34.	Which one of the following is not a buffer solution?
Answer» Which one of the following is not a buffer solution?

Discussion

35.	The standard reaction Gibbs energy for the electrochemical reaction, Cr2O2−7+2Fe+14H+→2Cr3++2Fe3++2H2O, is −793 kJ mol−1. The standard cell potential is Volts.
Answer» The standard reaction Gibbs energy for the electrochemical reaction, $C r_{2} O_{7}^{2 -} + 2 F e + 14 H^{+} \to 2 C r^{3 +} + 2 F e^{3 +} + 2 H_{2} O$ , is $- 793 k J m o l^{- 1}$ . The standard cell potential is Volts.

35.

The standard reaction Gibbs energy for the electrochemical reaction, Cr2O2−7+2Fe+14H+→2Cr3++2Fe3++2H2O, is −793 kJ mol−1. The standard cell potential is Volts.

Answer»

The standard reaction Gibbs energy for the electrochemical reaction,

$C r_{2} O_{7}^{2 -} + 2 F e + 14 H^{+} \to 2 C r^{3 +} + 2 F e^{3 +} + 2 H_{2} O$ , is $- 793 k J m o l^{- 1}$ . The standard cell potential is Volts.

Discussion

36.	Which of the following compounds has chlorine in +5 oxidation state?
Answer» Which of the following compounds has chlorine in +5 oxidation state?

Discussion

37.	On dissolving moderate amount of sodium metal in liquid NH3 at low temperature, which one of the following does not occur?
Answer» On dissolving moderate amount of sodium metal in liquid $N H_{3}$ at low temperature, which one of the following does not occur?

Discussion

38.	Which of the following molecules is least resonance stabilised?
Answer» Which of the following molecules is least resonance stabilised?

Discussion

39.	In a compound, atoms of element Y from ccp lattice and those of X occupy 13rd of tetrahedral voids. The formula of compound will be
Answer» In a compound, atoms of element Y from ccp lattice and those of X occupy ${\frac{1}{3}}^{r d}$ of tetrahedral voids. The formula of compound will be

Discussion

40.	Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
Answer» Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

Discussion

41.	There is an air bubble of radius R inside a drop of water of radius 3R. Find the ratio of gauge pressure at B to that at point A.
Answer» There is an air bubble of radius R inside a drop of water of radius 3R. Find the ratio of gauge pressure at B to that at point A.

Discussion

42.	When 2 moles of an ideal monoatomic gas are heated from 300 K to 600 K at constant pressure. The change in entropy of gas (△S) is:
Answer» When $2 m o l e s$ of an ideal monoatomic gas are heated from $300 K$ to $600 K$ at constant pressure. The change in entropy of gas $(△ S)$ is:

Discussion

43.	Complexes in which ligand substitution occurs fast are called
Answer» Complexes in which ligand substitution occurs fast are called

Discussion

44.	Phenolic inhibitors occur in plants as
Answer» Phenolic inhibitors occur in plants as

Discussion

45.	Generally why are heavy metals toxic to our body??and why do their ions act as enzyme inhibitors??
Answer» Generally why are heavy metals toxic to our body??and why do their ions act as enzyme inhibitors??

Discussion

46.	Among the following the strongest nucleophile is
Answer» Among the following the strongest nucleophile is

Discussion

47.	The product of the reaction CH3CH2OHcu,300∘C−−−−−→ ?
Answer» The product of the reaction $C H_{3} C H_{2} O H c u, 300^{\circ} C - ---- \to$ ?

Discussion

48.	Which among the following cannot form alum.
Answer» Which among the following cannot form alum.

Discussion

49.	The average osmotic pressure of human blood is 7.8 bar at 370C. What is the concentration of an aqueous NaCl solution that could be used in the bloodstream
Answer» The average osmotic pressure of human blood is 7.8 bar at 37⁰C. What is the concentration of an aqueous NaCl solution that could be used in the bloodstream

49.

The average osmotic pressure of human blood is 7.8 bar at 370C. What is the concentration of an aqueous NaCl solution that could be used in the bloodstream

Answer»

The average osmotic pressure of human blood is 7.8 bar at 37⁰C. What is the concentration of an aqueous NaCl solution that could be used in the bloodstream

Discussion

50.	why oxides of transition elements are more stable than fluorides?
Answer» why oxides of transition elements are more stable than fluorides?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Prove that the instantaneous rate of change of activity of a radioactive substance is inversely proportional to the square of its half life

The controversy is likely to create ___________ between the two societies.

If we have a pure MgCO3 sample that contains a total of 1.26 millimoles of electrons, the number of moles of MgCO3 present in the sample is x×10−5, x is.

Equal volumes of 10%vv of HCl is mixed with 10%vv NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

As ethers are not functional groups but in NCERT it is given that 'ethers are the least reactive of the functional groups' ( page 339) please explain?

A = {1, 2, 3, 4, 5} and B = {2, 3, 7} So A - B=?

Pick up the final product in the following reaction. Product is

ClO2+SbO−2→ClO−2+Sb(OH)−6 The balanced form of the above reaction in basic medium using oxidation number method is:

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, pick the correct option:

300 ml of a gas at 27∘ C is cooled to - 3∘ C at constant pressure, the final volume is ?

Kf for water is 1.86Kkg/molal. Therefore the freezing point of 0.1M NaCl solution is:

What is the maximum oxidation state shown by actinides?

The Cannizzaro’s reaction is not given by

Which one of the following aqueous solutions will exhibit highest boiling point ?

On the basis of LCAO-MO theory, the magnetic characteristics of N2 and N+2 are

Number of π electrons present in naphthalene is

The energy of an electron present in Bohr’s second orbit of hydrogen atom is

At 25oC, the free energy of formation of H2O(l) is −61076 cal/mol. The free energy of ionisation of water to H+ and OH− is 19050 cal/mol. The reversible EMF (in V) of the following cell at 25oC is: H2(g)(1 atm)|H+||O2(g)(1 atm)|OH−

Which of the following compounds is an optically active compound

After adding a non volatile solute, freezing point of solution decreases to - 0.186. Calculate

Mention four important causes of environmental degradation.

Calculate wavelength, frequency wave number of light whose period is 2×10−10 second.

Which of the following can be a conjugate system ?

Arrange the following in the decreasing order of basicity:

Consider the following reactions, which are carried out at the same temperature. CH3−Br+OH⊕EtOH−−−→CH3−OH+Br⊖ ⋯(i)CH3−Br+OH⊕DMSO−−−−→CH3−OH+Br⊖ ⋯(ii) Which of the following statement is correct about these reactions?

IUPAC name of (CH3)2CH - N(CH3)2 is

Which one of the following is not a buffer solution?

The standard reaction Gibbs energy for the electrochemical reaction, Cr2O2−7+2Fe+14H+→2Cr3++2Fe3++2H2O, is −793 kJ mol−1. The standard cell potential is Volts.

Which of the following compounds has chlorine in +5 oxidation state?

On dissolving moderate amount of sodium metal in liquid NH3 at low temperature, which one of the following does not occur?

Which of the following molecules is least resonance stabilised?

In a compound, atoms of element Y from ccp lattice and those of X occupy 13rd of tetrahedral voids. The formula of compound will be

Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

There is an air bubble of radius R inside a drop of water of radius 3R. Find the ratio of gauge pressure at B to that at point A.

When 2 moles of an ideal monoatomic gas are heated from 300 K to 600 K at constant pressure. The change in entropy of gas (△S) is:

Complexes in which ligand substitution occurs fast are called

Phenolic inhibitors occur in plants as

Generally why are heavy metals toxic to our body??and why do their ions act as enzyme inhibitors??

Among the following the strongest nucleophile is

The product of the reaction CH3CH2OHcu,300∘C−−−−−→ ?

Which among the following cannot form alum.

The average osmotic pressure of human blood is 7.8 bar at 370C. What is the concentration of an aqueous NaCl solution that could be used in the bloodstream

why oxides of transition elements are more stable than fluorides?