46295 + Interview Questions in Chemistry

1.	Why is adsorption always exothermic?
Answer» Why is adsorption always exothermic?

Discussion

2.	In a certain code ‘AEROBIC’ is written as ‘BFQNAJD’. How is ‘ADVERTS’ written in that code?
Answer» In a certain code ‘AEROBIC’ is written as ‘BFQNAJD’. How is ‘ADVERTS’ written in that code?

Discussion

3.	AX2 is a sparingly soluble salt. The solubility product of AX2 is 3.2×10−11. Find the value of solubility (s) in mol L−1 ?
Answer» $A X_{2}$ is a sparingly soluble salt. The solubility product of $A X_{2}$ is $3.2 \times 10^{- 11} .$ Find the value of solubility $(s)$ in $m o l L^{- 1}$ ?

Discussion

4.	0.1 mole of a metal is burnt in air it forms an oxide. The same oxide is then reduced by 4 L of 0.05 M S2O2−3 (acidic medium) to a +3 oxidation state of the metal. What is the oxidation state of the metal in the oxide?
Answer» 0.1 mole of a metal is burnt in air it forms an oxide. The same oxide is then reduced by $4 L$ of $0.05 M$ $S_{2} O_{3}^{2 -}$ (acidic medium) to a +3 oxidation state of the metal. What is the oxidation state of the metal in the oxide?

Discussion

5.	Out of the three isotopes of hydrogen which is more electronegitive and why ?
Answer» Out of the three isotopes of hydrogen which is more electronegitive and why ?

Discussion

6.	Which of the following reagent is used in Finkelstein reaction?
Answer» Which of the following reagent is used in Finkelstein reaction?

Discussion

7.	The solubility of sparingly soluble salt CdCO3 is 2×10−6 mol L−1 at 25oC. The Ksp value for CdCO3 is:
Answer» The solubility of sparingly soluble salt $C d C O_{3}$ is $2 \times 10^{- 6}$ $m o l L^{- 1}$ at $25^{o} C$ . The $K_{s p}$ value for $C d C O_{3}$ is:

Discussion

8.	Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will bea.0.1 Mb.0.05 Mc.0.2 Md.0M
Answer» Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will be a.0.1 M b.0.05 M c.0.2 M d.0M

8.

Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will bea.0.1 Mb.0.05 Mc.0.2 Md.0M

Answer»

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

a.0.1 M

b.0.05 M

c.0.2 M

d.0M

Discussion

9.	State Raoult's law for a solution containing volatile components. Write two differences between an ideal solution and a non-ideal solution.
Answer» State Raoult's law for a solution containing volatile components. Write two differences between an ideal solution and a non-ideal solution.

Discussion

10.	In Lassaigne’s test for sulphur, the purple colour formed after the addition of sodium nitroprusside is due to:
Answer» In Lassaigne’s test for sulphur, the purple colour formed after the addition of sodium nitroprusside is due to:

Discussion

11.	The rate constant for the first order reaction is 60 s-1. How much time will it take to reduce the concentration of the reactant to 1/16th value?
Answer» The rate constant for the first order reaction is 60 s^-1. How much time will it take to reduce the concentration of the reactant to 1/16th value?

Discussion

12.	The ionization enthalpies of Li and Sodium are 520 KJ/mole and 495 KJ/mole respectively. The energy required to convert all the atoms present in 7mg of Li vapours and 23 mg of Sodium vapours to their respective gaseous cations respectively are
Answer» The ionization enthalpies of Li and Sodium are 520 KJ/mole and 495 KJ/mole respectively. The energy required to convert all the atoms present in 7mg of Li vapours and 23 mg of Sodium vapours to their respective gaseous cations respectively are

Discussion

13.	The activation energy of a chemical reaction can be determined by
Answer» The activation energy of a chemical reaction can be determined by

Discussion

14.	A reaction occurs spontaneously if:
Answer» A reaction occurs spontaneously if:

Discussion

15.	What is washing soda?
Answer» What is washing soda?

Discussion

16.	Elements of Group-1 are called:
Answer» Elements of Group-1 are called:

Discussion

17.	What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group?
Answer» What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group?

Discussion

18.	The correct representation for solubility product of SnS2 is:
Answer» The correct representation for solubility product of SnS₂ is:

18.

The correct representation for solubility product of SnS2 is:

Answer»

The correct representation for solubility product of SnS₂ is:

Discussion

19.	Calculate the number of formula units of CuSO4.5H2O present in 10−13 moles of pure CuSO4.5H2O.
Answer» Calculate the number of formula units of $C u S O_{4} .5 H_{2} O$ present in $10^{- 13}$ moles of pure $C u S O_{4} .5 H_{2} O$ .

Discussion

20.	In which case, shape of the molecule is pyramidal?
Answer» In which case, shape of the molecule is pyramidal?

Discussion

21.	Which of the following pair/s have nearly same size?
Answer» Which of the following pair/s have nearly same size?

Discussion

22.	Two moles of a perfect gas undergo the following processes (i) a reversible isobaric expansion from (1.0 am, 20.0L) to (1.0 atm, 40.0 L) (ii) a reversible isochoric change of state from (1.0 atm, 40.0 L) to (0.5 atm, 40.0 L); (iii) a reversible isothermal compression from (0.5 am, 40.0 L) to (1.0 atm, 20.0 L) What is the total heat exchange here in Joules? ln2=0.7, ln3=1.1, R=1/12 L atm/mol, 25/3 J/mol K, 1L atm=101 J
Answer» Two moles of a perfect gas undergo the following processes (i) a reversible isobaric expansion from (1.0 am, 20.0L) to (1.0 atm, 40.0 L) (ii) a reversible isochoric change of state from (1.0 atm, 40.0 L) to (0.5 atm, 40.0 L); (iii) a reversible isothermal compression from (0.5 am, 40.0 L) to (1.0 atm, 20.0 L) What is the total heat exchange here in Joules? $l n 2 = 0.7, l n 3 = 1.1, R = 1 / 12 L a t m / m o l, 25 / 3 J / m o l K, 1 L a t m = 101 J$

Discussion

23.	Oxygen can form bonds.
Answer» Oxygen can form bonds.

Discussion

24.	The reaction of formic acid with concentrated H2SO4 gives
Answer» The reaction of formic acid with concentrated $H_{2} S O_{4}$ gives

Discussion

25.	The ratio of molecular mass of two radioactive substance is 32 and the ratio of their decay constant is 43. Then the ratio of their initial activity per mole will be
Answer» The ratio of molecular mass of two radioactive substance is $\frac{3}{2}$ and the ratio of their decay constant is $\frac{4}{3}$ . Then the ratio of their initial activity per mole will be

Discussion

26.	One mole of a gas exhibiting ideal behavior is enclosed in vessel of 1 litre capacity and is placed in a reservoir at temperature T(K). The pressure recorded in a flask is 2 bar. If the pressure in the flask is to be changed to 1.5 bar, how many molecules of the gas must escape out from the vessel?
Answer» One mole of a gas exhibiting ideal behavior is enclosed in vessel of 1 litre capacity and is placed in a reservoir at temperature T(K). The pressure recorded in a flask is 2 bar. If the pressure in the flask is to be changed to 1.5 bar, how many molecules of the gas must escape out from the vessel?

Discussion

27.	The protecting power of lyophilic colloidal sol is expressed in terms of
Answer» The protecting power of lyophilic colloidal sol is expressed in terms of

Discussion

28.	The activation energy for a reaction is 25 kJmol−1. If the rate of the reaction should be increased 10 times, what should be the temperature to which it should be raised, if the initial temperature is 300 K?389.6
Answer» The activation energy for a reaction is 25 $k J m o l^{- 1}$ . If the rate of the reaction should be increased 10 times, what should be the temperature to which it should be raised, if the initial temperature is 300 K? 389.6

Discussion

29.	The purity of H2O2 in a given sample is 85%.Calculate the weight of impure sample of H2O2 which requires 10 ml of M5 KMnO4 solution in a titration in acidic medium
Answer» The purity of $H_{2} O_{2}$ in a given sample is 85%.Calculate the weight of impure sample of $H_{2} O_{2}$ which requires 10 ml of $\frac{M}{5} K M n O_{4}$ solution in a titration in acidic medium

Discussion

30.	Write a short note on the triple point of water.
Answer» Write a short note on the triple point of water.

Discussion

31.	Which substance acts as a reducing agent in the following reaction 14H++Cr2O2−7+2Cr3++7H2O+3Ni2+
Answer» Which substance acts as a reducing agent in the following reaction $14 H^{+} + C r_{2} O_{7}^{2 -} + 2 C r^{3 +} + 7 H_{2} O + 3 N i^{2 +}$

Discussion

32.	During the expansion of an ideal gas, the work done by the gas is 100 J and the heat capacity of the process is found to be +2 J/oC. Find △U of the gas if the final temperature of the gas is 25oC higher than its initial temperature.
Answer» During the expansion of an ideal gas, the work done by the gas is $100 J$ and the heat capacity of the process is found to be $+ 2 J /^{o} C$ . Find $△ U$ of the gas if the final temperature of the gas is $25^{o} C$ higher than its initial temperature.

Discussion

33.	N2+3H2→2NH3 1 mol of N2 and 4 mol of H2 are taken in a 15 L flask at 27∘C. After the complete conversion of N2 into NH3, 5 L of H2O is added. The pressure set up in the flask is:
Answer» $N_{2} + 3 H_{2} \to 2 N H_{3}$ 1 mol of $N_{2}$ and 4 mol of $H_{2}$ are taken in a $15 L$ flask at $27^{\circ} C$ . After the complete conversion of $N_{2}$ into $N H_{3}$ , $5 L$ of $H_{2} O$ is added. The pressure set up in the flask is:

Discussion

34.	Two solid compounds X and Y dissociates at a certain temperature as follows X(S)⇌A(g)+2B(g);KP1=9×10−3 atm3 Y(s)⇌2B(g)+C(g); KP2=4.5×10−3 atm3 The total pressure (in atm) of gases over a mixture of X and Y is :
Answer» Two solid compounds $X$ and $Y$ dissociates at a certain temperature as follows $X (S) ⇌ A (g) + 2 B (g); K_{P 1} = 9 \times 10^{- 3} a t m^{3}$ $Y (s) ⇌ 2 B (g) + C (g); K_{P 2} = 4.5 \times 10^{- 3} a t m^{3}$ The total pressure (in atm) of gases over a mixture of $X$ and $Y$ is :

Discussion

35.	Describe the role of the following : (i) SiO2 in the extraction of copper from copper matte. (ii) NaCN in froth floatation process.
Answer» Describe the role of the following : (i) $S i O_{2}$ in the extraction of copper from copper matte. (ii) NaCN in froth floatation process.

Discussion

36.	A compound of vanadium has a magnetic moment (μ) of 1.73 BM. If the vanadium ion in the compound is present as Vx+, then the value of x is ?
Answer» A compound of vanadium has a magnetic moment $(μ)$ of $1.73 B M$ . If the vanadium ion in the compound is present as $V^{x +}$ , then the value of $x$ is ?

Discussion

37.	80 mL of KMnO4 solution reacts with 3.4 g of Na2C2O4.2H2O in an acidic medium. The molarity (in M) of the KMnO4 solution is:
Answer» $80 m L$ of $K M n O_{4}$ solution reacts with $3.4 g$ of $N a_{2} C_{2} O_{4} .2 H_{2} O$ in an acidic medium. The molarity (in M) of the $K M n O_{4}$ solution is:

Discussion

38.	For the chemical equilibrium, CaCO3(s)⇌CaO(s)+CO2(g),△Ho, can be determined from which one of the following plots
Answer» For the chemical equilibrium, $C a C O_{3} (s) ⇌ C a O (s) + C O_{2} (g), △ H^{o},$ can be determined from which one of the following plots

Discussion

39.	What problem arises in using alitame as artificial sweetener ?
Answer» What problem arises in using alitame as artificial sweetener ?

Discussion

40.	Write the IUPAC names of the following ketones and aldehydes, wherever possible, give also common names. CH3CO(CH2)4CH3 CH3CH2CHBrCH2CH(CH3)CHO CH3(CH2)5CHO Ph−CH=CH−CHO PhCOPh
Answer» Write the IUPAC names of the following ketones and aldehydes, wherever possible, give also common names. $C H_{3} C O (C H_{2})_{4} C H_{3}$ $C H_{3} C H_{2} C H B r C H_{2} C H (C H_{3}) C H O$ $C H_{3} (C H_{2})_{5} C H O$ $P h - C H = C H - C H O$ PhCOPh

40.

Write the IUPAC names of the following ketones and aldehydes, wherever possible, give also common names. CH3CO(CH2)4CH3 CH3CH2CHBrCH2CH(CH3)CHO CH3(CH2)5CHO Ph−CH=CH−CHO PhCOPh

Answer»

Write the IUPAC names of the following ketones and aldehydes, wherever possible, give also common names.

$C H_{3} C O (C H_{2})_{4} C H_{3}$

$C H_{3} C H_{2} C H B r C H_{2} C H (C H_{3}) C H O$

$C H_{3} (C H_{2})_{5} C H O$

$P h - C H = C H - C H O$

PhCOPh

Discussion

41.	Where X is a compound that forms azo-dye with benzene diazonium chloride in faintly basic medium. The products P, X and Y will be respectively
Answer» Where X is a compound that forms azo-dye with benzene diazonium chloride in faintly basic medium. The products P, X and Y will be respectively

Discussion

42.	why is it easier to reduce oxide ores compared to sulphide ores?
Answer» why is it easier to reduce oxide ores compared to sulphide ores?

Discussion

43.	Calculate the enthalpy change when infinity dilute solutions of CaCl2 and Na2CO3 are mixed. ΔH∘f for Ca2+(aq),CO2−3(aq) and CaCO3(s) are -129.65 and -288.45 kcal mol−1 respectively.
Answer» Calculate the enthalpy change when infinity dilute solutions of $C a C l_{2}$ and $N a_{2} C O_{3}$ are mixed. $Δ H_{f}^{\circ}$ for $C a^{2 + (a q), C O_{3}^{2 -}} (a q)$ and $C a C O_{3} (s)$ are -129.65 and -288.45 kcal mol $^{- 1}$ respectively.

Discussion

44.	Human blood gives rise to an osmotic pressure of approximately 7.65 atm at body temperature, 37 ∘C. Hence, molarity of an intravenous glucose solution to have the same osmotic pressure as blood is:
Answer» Human blood gives rise to an osmotic pressure of approximately $7.65 a t m$ at body temperature, $37^{\circ} C$ . Hence, molarity of an intravenous glucose solution to have the same osmotic pressure as blood is:

Discussion

45.	The uncertainty in the position of a ball weighing 50 g is ±10−4 mm. Calculate the minimum uncertainty in its velocity in m/s
Answer» The uncertainty in the position of a ball weighing 50 g is $\pm 10^{- 4} m m$ . Calculate the minimum uncertainty in its velocity in m/s

Discussion

46.	The molecular formula of the oxide of iron in which mass percentage of iron and oxygen are 69.0 and 30.1 respectively ?
Answer» The molecular formula of the oxide of iron in which mass percentage of iron and oxygen are 69.0 and 30.1 respectively ?

Discussion

47.	The product of the following reaction is CH3CH2OCH2CH3+CH3COClAnhydrous−−−−−−→AICl3 ?
Answer» The product of the following reaction is $C H_{3} C H_{2} O C H_{2} C H_{3} + C H_{3} C O C l A n h y d r o u s - ----- \to A I C l_{3}$ ?

Discussion

48.	In the reaction Acetaldehyde O→AP,Cl2−−−→BKCN−−−→CH+,H2O−−−−−→D the product ‘D’ is
Answer» In the reaction Acetaldehyde $O \to A P, C l_{2} - -- \to B K C N - -- \to C H^{+}, H_{2} O - ---- \to D$ the product ‘D’ is

Discussion

49.	Match the complex ions in column-I with their information in column-II Columns - IColumn - II(P)[MnCl6]2−(2)sp3d2 hybridisation(Q)[Fe(CN)6]3−(2)Is attracted toward a magnet(R)[CoF6]3−(3)Is low spin complex(S)[Fe(NH3)6]2+(4)Oxidation state of metal≥+3(5)Is inner orbital octa hedral complex Match each product in LIST-I with one or more reaction in LIST-II and choose the correct option.
Answer» Match the complex ions in column-I with their information in column-II $\begin{matrix} Columns - I & Column - II (P) & [M n C l_{6}]^{2 -} & (2) & s p^{3} d^{2} hybridisation (Q) & [F e (C N)_{6}]^{3 -} & (2) & Is attracted toward a magnet (R) & [C o F_{6}]^{3 -} & (3) & Is low spin complex (S) & [F e (N H_{3})_{6}]^{2 +} & (4) & Oxidation state of metal \geq + 3 (5) & Is inner orbital octa hedral complex \end{matrix}$ Match each product in LIST-I with one or more reaction in LIST-II and choose the correct option.

Discussion

50.	A balloon filled with methane (CH4) is pricked with a sharp point and quickly plunged into a tank of hydrogen at the same pressure. After sometime, the balloon will have:
Answer» A balloon filled with methane (CH₄) is pricked with a sharp point and quickly plunged into a tank of hydrogen at the same pressure. After sometime, the balloon will have:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why is adsorption always exothermic?

In a certain code ‘AEROBIC’ is written as ‘BFQNAJD’. How is ‘ADVERTS’ written in that code?

AX2 is a sparingly soluble salt. The solubility product of AX2 is 3.2×10−11. Find the value of solubility (s) in mol L−1 ?

0.1 mole of a metal is burnt in air it forms an oxide. The same oxide is then reduced by 4 L of 0.05 M S2O2−3 (acidic medium) to a +3 oxidation state of the metal. What is the oxidation state of the metal in the oxide?

Out of the three isotopes of hydrogen which is more electronegitive and why ?

Which of the following reagent is used in Finkelstein reaction?

The solubility of sparingly soluble salt CdCO3 is 2×10−6 mol L−1 at 25oC. The Ksp value for CdCO3 is:

Equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed. The concentration of the resulting solution will bea.0.1 Mb.0.05 Mc.0.2 Md.0M

State Raoult's law for a solution containing volatile components. Write two differences between an ideal solution and a non-ideal solution.

In Lassaigne’s test for sulphur, the purple colour formed after the addition of sodium nitroprusside is due to:

The rate constant for the first order reaction is 60 s-1. How much time will it take to reduce the concentration of the reactant to 1/16th value?

The ionization enthalpies of Li and Sodium are 520 KJ/mole and 495 KJ/mole respectively. The energy required to convert all the atoms present in 7mg of Li vapours and 23 mg of Sodium vapours to their respective gaseous cations respectively are

The activation energy of a chemical reaction can be determined by

A reaction occurs spontaneously if:

What is washing soda?

Elements of Group-1 are called:

What are the various factors due to which the ionization enthalpy of the main group elements tends to decrease down a group?

The correct representation for solubility product of SnS2 is:

Calculate the number of formula units of CuSO4.5H2O present in 10−13 moles of pure CuSO4.5H2O.

In which case, shape of the molecule is pyramidal?

Which of the following pair/s have nearly same size?

Oxygen can form bonds.

The reaction of formic acid with concentrated H2SO4 gives

The ratio of molecular mass of two radioactive substance is 32 and the ratio of their decay constant is 43. Then the ratio of their initial activity per mole will be

One mole of a gas exhibiting ideal behavior is enclosed in vessel of 1 litre capacity and is placed in a reservoir at temperature T(K). The pressure recorded in a flask is 2 bar. If the pressure in the flask is to be changed to 1.5 bar, how many molecules of the gas must escape out from the vessel?

The protecting power of lyophilic colloidal sol is expressed in terms of

The activation energy for a reaction is 25 kJmol−1. If the rate of the reaction should be increased 10 times, what should be the temperature to which it should be raised, if the initial temperature is 300 K?389.6

The purity of H2O2 in a given sample is 85%.Calculate the weight of impure sample of H2O2 which requires 10 ml of M5 KMnO4 solution in a titration in acidic medium

Write a short note on the triple point of water.

Which substance acts as a reducing agent in the following reaction 14H++Cr2O2−7+2Cr3++7H2O+3Ni2+

During the expansion of an ideal gas, the work done by the gas is 100 J and the heat capacity of the process is found to be +2 J/oC. Find △U of the gas if the final temperature of the gas is 25oC higher than its initial temperature.

N2+3H2→2NH3 1 mol of N2 and 4 mol of H2 are taken in a 15 L flask at 27∘C. After the complete conversion of N2 into NH3, 5 L of H2O is added. The pressure set up in the flask is:

Two solid compounds X and Y dissociates at a certain temperature as follows X(S)⇌A(g)+2B(g);KP1=9×10−3 atm3 Y(s)⇌2B(g)+C(g); KP2=4.5×10−3 atm3 The total pressure (in atm) of gases over a mixture of X and Y is :

Describe the role of the following : (i) SiO2 in the extraction of copper from copper matte. (ii) NaCN in froth floatation process.

A compound of vanadium has a magnetic moment (μ) of 1.73 BM. If the vanadium ion in the compound is present as Vx+, then the value of x is ?

80 mL of KMnO4 solution reacts with 3.4 g of Na2C2O4.2H2O in an acidic medium. The molarity (in M) of the KMnO4 solution is:

For the chemical equilibrium, CaCO3(s)⇌CaO(s)+CO2(g),△Ho, can be determined from which one of the following plots

What problem arises in using alitame as artificial sweetener ?

Write the IUPAC names of the following ketones and aldehydes, wherever possible, give also common names. CH3CO(CH2)4CH3 CH3CH2CHBrCH2CH(CH3)CHO CH3(CH2)5CHO Ph−CH=CH−CHO PhCOPh

Where X is a compound that forms azo-dye with benzene diazonium chloride in faintly basic medium. The products P, X and Y will be respectively

why is it easier to reduce oxide ores compared to sulphide ores?

Calculate the enthalpy change when infinity dilute solutions of CaCl2 and Na2CO3 are mixed. ΔH∘f for Ca2+(aq),CO2−3(aq) and CaCO3(s) are -129.65 and -288.45 kcal mol−1 respectively.

Human blood gives rise to an osmotic pressure of approximately 7.65 atm at body temperature, 37 ∘C. Hence, molarity of an intravenous glucose solution to have the same osmotic pressure as blood is:

The uncertainty in the position of a ball weighing 50 g is ±10−4 mm. Calculate the minimum uncertainty in its velocity in m/s

The molecular formula of the oxide of iron in which mass percentage of iron and oxygen are 69.0 and 30.1 respectively ?

The product of the following reaction is CH3CH2OCH2CH3+CH3COClAnhydrous−−−−−−→AICl3 ?

In the reaction Acetaldehyde O→AP,Cl2−−−→BKCN−−−→CH+,H2O−−−−−→D the product ‘D’ is

A balloon filled with methane (CH4) is pricked with a sharp point and quickly plunged into a tank of hydrogen at the same pressure. After sometime, the balloon will have: