46295 + Interview Questions in Chemistry

1.	Which of the following equations correctly represents the standard heat of formation of methane
Answer» Which of the following equations correctly represents the standard heat of formation of methane

Discussion

2.	The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because ...
Answer» The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because ...

Discussion

3.	The total number of hyperconjugative structures involving C - H bonds for the following Carbocation is CH3 − CH2 − ⊕CH − CH\|CH3 − CH3
Answer» The total number of hyperconjugative structures involving C - H bonds for the following Carbocation is $C H_{3} - C H_{2} - \oplus C H - C H \| C H_{3} - C H_{3}$

3.

The total number of hyperconjugative structures involving C - H bonds for the following Carbocation is CH3 − CH2 − ⊕CH − CH|CH3 − CH3

Answer»

The total number of hyperconjugative structures involving C - H bonds for the following Carbocation is

$C H_{3} - C H_{2} - \oplus C H - C H | C H_{3} - C H_{3}$

Discussion

4.	Which type of colloid has the particle size in between 1nm to 1000nm?
Answer» Which type of colloid has the particle size in between 1nm to 1000nm?

Discussion

5.	Assuming complete dissociatoin of solutes, calculate the pH of the solution obtained by mixing equal volumes of 2N5 NaOH and N5 HCl
Answer» Assuming complete dissociatoin of solutes, calculate the pH of the solution obtained by mixing equal volumes of $\frac{2 N}{5} N a O H$ and $\frac{N}{5} H C l$

Discussion

6.	If 2 moles of sugar are dissolved in 1000g of water, the elevation in boiling point of the resulting solution is: (Kb = 0.52 K kg mol-1):
Answer» If 2 moles of sugar are dissolved in 1000g of water, the elevation in boiling point of the resulting solution is: (K_b = 0.52 K kg mol^-1):

Discussion

7.	Saccharin (Ka=2×10−12) is a weak acid represented by formula HSaC. 4×10−4 moles of saccharin are dissolved in 200 cc buffer of pH 3. Assuming no change in volume, calculate the concentration of saC−1 ions in the resulting solution at equilibrium. (Assume jpH of buffer is maintained)
Answer» Saccharin $(K_{a} = 2 \times 10^{- 12})$ is a weak acid represented by formula HSaC. $4 \times 10^{- 4}$ moles of saccharin are dissolved in 200 cc buffer of pH 3. Assuming no change in volume, calculate the concentration of $s a C^{- 1}$ ions in the resulting solution at equilibrium. (Assume jpH of buffer is maintained)

Discussion

8.	Detection of nitrogen by Lassaigne's test .
Answer» Detection of nitrogen by Lassaigne's test .

Discussion

9.	In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion Ca2+ and fluoride ion (F−) are
Answer» In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion $C a^{2 +}$ and fluoride ion $(F^{-})$ are

Discussion

10.	Number of moles of Cr2O−27 required to oxidise one mole of ferrous ion completely in acidic medium.
Answer» Number of moles of $C r_{2} O_{7}^{- 2}$ required to oxidise one mole of ferrous ion completely in acidic medium.

Discussion

11.	During adiabatic expansion of an ideal gas
Answer» During adiabatic expansion of an ideal gas

Discussion

12.	From 200 mg of CO2, 1021 molecules are removed. How many moles of CO2 are left?
Answer» From $200 mg$ of $C O_{2}$ , $10^{21}$ molecules are removed. How many moles of $C O_{2}$ are left?

Discussion

13.	x gm of water is mixed with 69 gm of ethanol. The mole fraction of ethanol in the resulting solution is 0.6. What is the value of 'x' in gm.
Answer» x gm of water is mixed with 69 gm of ethanol. The mole fraction of ethanol in the resulting solution is 0.6. What is the value of 'x' in gm.

Discussion

14.	50ml of a mixture of NaOH and Na2CO3 titrated with N10 HCl using phenolpthalein indicator required 50ml of HCl to decolourise phenolpthalein. At this stage methyl orange was added and addition of acid was continued. The second end point was reached after further addition of 10ml of N10 HCl. The amount of NaOH in the solution is:
Answer» $50 m l$ of a mixture of $N a O H$ and $N a_{2} C O_{3}$ titrated with $\frac{N}{10} H C l$ using phenolpthalein indicator required $50 m l$ of $H C l$ to decolourise phenolpthalein. At this stage methyl orange was added and addition of acid was continued. The second end point was reached after further addition of $10 m l$ of $\frac{N}{10} H C l$ . The amount of $N a O H$ in the solution is:

Discussion

15.	Calculate the useful work done during the reaction in kJ/mol. Ag(S)+12 Cl2(g)→AgCl(s) Given that E0Cl2/Cl−=+1.36V and E0Ag+\|AgCl\|Cl−=+0.220V PCl2=1 atm and T = 298 K
Answer» Calculate the useful work done during the reaction in kJ/mol. $A g (S) + \frac{1}{2} C l_{2} (g) \to A g C l (s)$ Given that $E_{C l_{2} / {C l}^{-}}^{0} = + 1.36 V$ and $E_{A g^{+} \| A g C l \| C l^{-}}^{0} = + 0.220 V$ $P_{C l_{2}} = 1 atm$ and T = 298 K

Discussion

16.	If M is the atomic mass and A is the mass, number, packing fraction is given by
Answer» If M is the atomic mass and A is the mass, number, packing fraction is given by

Discussion

17.	Consider the Arrhenius equation given below and mark the correct option. k=A.e−EaRT (a) Rate constant increases exponentially with increasing activation energy and decreasing temperature (b) Rate constant decreases exponentially with increasing activation energy and decreasing temperature (c) Rate constant increases exponentially with decreasing activation energy and decreasing temperature (d) Rate constant increases exponentially with decreasing activation energy and increasing temperature
Answer» Consider the Arrhenius equation given below and mark the correct option. $k = A . e - \frac{E_{a}}{R T}$ (a) Rate constant increases exponentially with increasing activation energy and decreasing temperature (b) Rate constant decreases exponentially with increasing activation energy and decreasing temperature (c) Rate constant increases exponentially with decreasing activation energy and decreasing temperature (d) Rate constant increases exponentially with decreasing activation energy and increasing temperature

Discussion

18.	If a saturated solution is prepared by dissolving Ag2CO3 in water has [Ag+]=2.56×10−4. What is the value of Ksp for Ag2CO3?
Answer» If a saturated solution is prepared by dissolving $A g_{2} C O_{3}$ in water has $[A g^{+}] = 2.56 \times 10^{- 4}$ . What is the value of $K_{s p}$ for $A g_{2} C O_{3}$ ?

Discussion

19.	The value of nC01⋅2− nC12⋅3+ nC23⋅4+⋯+(−1)n nCn(n+1)⋅(n+2) is
Answer» The value of $\frac{^{n} C_{0}}{1 \cdot 2} - \frac{^{n} C_{1}}{2 \cdot 3} + \frac{^{n} C_{2}}{3 \cdot 4} + \dots + (- 1)^{n} \frac{^{n} C_{n}}{(n + 1) \cdot (n + 2)}$ is

Discussion

20.	The conjugate acid of (CH3)2 ¨NH is :
Answer» The conjugate acid of $(C H_{3})_{2}$ $¨ N H$ is :

Discussion

21.	Why does cis-polyisoprene posses elastic property?
Answer» Why does cis-polyisoprene posses elastic property?

Discussion

22.	How many of the following are mixed anhydrides ? P4O10,CO,SO2,ClO2,Cl2O,N2O,NO2,Cl2O6,CO2,Cl2O7,SO3 __
Answer» How many of the following are mixed anhydrides ? $P_{4} O_{10}, C O, S O_{2}, C l O_{2}, C l_{2} O, N_{2} O, N O_{2}, C l_{2} O_{6}, C O_{2}, C l_{2} O_{7}, S O_{3}$ __

22.

How many of the following are mixed anhydrides ? P4O10,CO,SO2,ClO2,Cl2O,N2O,NO2,Cl2O6,CO2,Cl2O7,SO3 __

Answer»

How many of the following are mixed anhydrides ?

$P_{4} O_{10}, C O, S O_{2}, C l O_{2}, C l_{2} O, N_{2} O, N O_{2}, C l_{2} O_{6}, C O_{2}, C l_{2} O_{7}, S O_{3}$

__

Discussion

23.	Two glass bulbs of equal volumes are connected by a narrow tube and are filled with an ideal gas at 0∘C and a pressure of 76 cm of mercury. One of the bulbs is then placed in a water bath maintained at 62∘C. What is the new value of the pressure inside the bulbs?
Answer» Two glass bulbs of equal volumes are connected by a narrow tube and are filled with an ideal gas at $0^{\circ} C$ and a pressure of 76 cm of mercury. One of the bulbs is then placed in a water bath maintained at $62^{\circ} C$ . What is the new value of the pressure inside the bulbs?

Discussion

24.	5 ml of a gaseous hydrocarbon(CxHy) was exploded with 30 ml of oxygen. The resulting gas on cooling to room temperature is found to measure 25 ml of which 10 ml are absorbed by NaOH and the remainder by pyrogallol. The value of x+y is? ___
Answer» 5 $m l$ of a gaseous hydrocarbon( $C_{x} H_{y}$ ) was exploded with 30 $m l$ of oxygen. The resulting gas on cooling to room temperature is found to measure 25 $m l$ of which 10 $m l$ are absorbed by $N a O H$ and the remainder by pyrogallol. The value of x+y is? ___

Discussion

25.	One mole of complex compound Co(NH3)5Cl3 gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO3 to yeild two moles of AgCl(S). The complex is:
Answer» One mole of complex compound $C o (N H_{3})_{5} C l_{3}$ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $A g N O_{3}$ to yeild two moles of $A g C l_{(S)}$ . The complex is:

Discussion

26.	Match the following: a) Lyman (r, t)p) visibleb) Balmer (p)q) Infraredc) Paschen (q, s)r) Ultravioletd) Brackett (q)s)n2=4,n1=3t)n2=5,n1=1
Answer» Match the following: $\begin{matrix} a) Lyman (r, t) & p) visible b) Balmer (p) & q) Infrared c) Paschen (q, s) & r) Ultraviolet d) Brackett (q) & s) n_{2} = 4, n_{1} = 3 t) n_{2} = 5, n_{1} = 1 \end{matrix}$

26.

Match the following: a) Lyman (r, t)p) visibleb) Balmer (p)q) Infraredc) Paschen (q, s)r) Ultravioletd) Brackett (q)s)n2=4,n1=3t)n2=5,n1=1

Answer»

Match the following:

$\begin{matrix} a) Lyman (r, t) & p) visible b) Balmer (p) & q) Infrared c) Paschen (q, s) & r) Ultraviolet d) Brackett (q) & s) n_{2} = 4, n_{1} = 3 t) n_{2} = 5, n_{1} = 1 \end{matrix}$

Discussion

27.	A certain laser transition emits 6.37×1015 quanta sec−1m−2. Calculate the power output in J sec−1 m−2. Given: λ=632.8 nm
Answer» A certain laser transition emits $6.37 \times 10^{15} {quanta sec}^{- 1} m^{- 2}$ . Calculate the power output in ${J sec}^{- 1} m^{- 2}$ . Given: $λ = 632.8 nm$

Discussion

28.	In a cubic packed structure of a compound, the lattice is made up of oxide ions, one-fifth of the tetrahedral voids are occupied by X ions while half of the octahedral voids are occupied by Y ions. Then the formula of the oxide will be
Answer» In a cubic packed structure of a compound, the lattice is made up of oxide ions, one-fifth of the tetrahedral voids are occupied by X ions while half of the octahedral voids are occupied by Y ions. Then the formula of the oxide will be

Discussion

29.	Which of the following is not reasonable for an elimination reaction?
Answer» Which of the following is not reasonable for an elimination reaction?

Discussion

30.	According to Freundlich adsorption isotherm, which of the following is correct?
Answer» According to Freundlich adsorption isotherm, which of the following is correct?

Discussion

31.	How many litres of nitrogen gas is produced when 340 g of NH3 (Molar mass=17 g/mol) decomposes completely at STP?
Answer» How many litres of nitrogen gas is produced when 340 g of $N H_{3}$ (Molar mass=17 g/mol) decomposes completely at STP?

Discussion

32.	Which of the following statements would be INCORRECT about this compounds?
Answer» Which of the following statements would be INCORRECT about this compounds?

32.

Which of the following statements would be INCORRECT about this compounds?

Answer»

Which of the following statements would be INCORRECT about this compounds?

Discussion

33.	The species which can best serve as an initiator for cationic polymerization is:
Answer» The species which can best serve as an initiator for cationic polymerization is:

Discussion

34.	Number of moles of CH3MgBr consumed for one mole of given compound is:
Answer» Number of moles of $C H_{3} M g B r$ consumed for one mole of given compound is:

Discussion

35.	Highly pure dilute solution of sodium in liquid ammonia
Answer» Highly pure dilute solution of sodium in liquid ammonia

Discussion

36.	Which state of triply ionized beryllium (Be+++) has the same orbital radius as that of the ground state of hydrogen?
Answer» Which state of triply ionized beryllium ( $B e^{+ + +}$ ) has the same orbital radius as that of the ground state of hydrogen?

Discussion

37.	The correct order of mobility of alkali metal ions in aqueous solution is
Answer» The correct order of mobility of alkali metal ions in aqueous solution is

Discussion

38.	The solubility product (Ksp) of the following compounds are given at 25∘C. The compound most soluble and least soluble coumpounds are: Compounds Ksp AgCl 1.1×10−10AgI 1.1×10−16PbCrO4 4.0×10−14Ag2CO3 8.0×10−12
Answer» The solubility product $(K_{s p})$ of the following compounds are given at $25^{\circ} C$ . The compound most soluble and least soluble coumpounds are: Compounds $K_{s p}$ $A g C l 1.1 \times 10^{- 10} A g I 1.1 \times 10^{- 16} P b C r O_{4} 4.0 \times 10^{- 14} A g_{2} C O_{3} 8.0 \times 10^{- 12}$

Discussion

39.	Which pair of the following carbonyl compounds can be differentiated by I2/NaOH?
Answer» Which pair of the following carbonyl compounds can be differentiated by $I_{2} / N a O H$ ?

Discussion

40.	Which one of the following pairs of chemical species contains the ions having same hybridisation of the central atoms?
Answer» Which one of the following pairs of chemical species contains the ions having same hybridisation of the central atoms?

Discussion

41.	An ideal gas in a thermally insulated vessel at internal pressure=P1, volume=V1 and absolute temperature =T1 expands irreversibly against zero external pressure as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are P2, V2 and T2, respectively. For this expansion which of the following relation(s) holds true?
Answer» An ideal gas in a thermally insulated vessel at internal pressure $= P_{1}$ , volume $= V_{1}$ and absolute temperature $= T_{1}$ expands irreversibly against zero external pressure as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are $P_{2}, V_{2}$ and $T_{2}$ , respectively. For this expansion which of the following relation(s) holds true?

Discussion

42.	There is a substance whose vapourisation and freezing temperature (transition temperature) is same. It is placed at transition temperature with its main constituent being liquid state and a little vapour in a closed container. Now, vapour is pumped out continuosly. The fraction of this substance that will ultimately freeze is 78. If the latent heat of vaporization is ′x′ times the latent heat of fusion. Find out value of ′x′ (Answer upto two digit after decimal point).
Answer» There is a substance whose vapourisation and freezing temperature (transition temperature) is same. It is placed at transition temperature with its main constituent being liquid state and a little vapour in a closed container. Now, vapour is pumped out continuosly. The fraction of this substance that will ultimately freeze is $\frac{7}{8}$ . If the latent heat of vaporization is $^{'} x^{'}$ times the latent heat of fusion. Find out value of $^{'} x^{'}$ (Answer upto two digit after decimal point).

Discussion

43.	The structures of quartz, mica, asbestos have the common basic unit of-
Answer» The structures of quartz, mica, asbestos have the common basic unit of-

Discussion

44.	The compound that does not produce nitrogen gas by thermal decomposition is:
Answer» The compound that does not produce nitrogen gas by thermal decomposition is:

Discussion

45.	Experimental molecular weight of acetic acid is _____ that of theoretical molecular weight.
Answer» Experimental molecular weight of acetic acid is _____ that of theoretical molecular weight.

Discussion

46.	The correct order in which the O−O bond length increases in the following is:
Answer» The correct order in which the $O - O$ bond length increases in the following is:

Discussion

47.	What are the functions performed by histamine in the body?
Answer» What are the functions performed by histamine in the body?

Discussion

48.	Given that: C(graphite)+ O2(g) →CO2(g) ΔH=x kJ mol−1 C(graphite)+ 12O2(g) →CO2(g) ΔH=y kJ mol−1 CO(g)+ 12O2(g) →CO2(g) ΔH=z kJ mol−1 Based on the given thermochemical equations, find out which one of the following algebric relationships is correct?
Answer» Given that: $C (g r a p h i t e) + O_{2} (g) \to C O_{2} (g) Δ H = x k J m o l^{- 1}$ $C (g r a p h i t e) + \frac{1}{2} O_{2} (g) \to C O_{2} (g) Δ H = y k J m o l^{- 1}$ $C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g) Δ H = z k J m o l^{- 1}$ Based on the given thermochemical equations, find out which one of the following algebric relationships is correct?

Discussion

49.	With what neutral molecules is ClO− isoelectronic? Is that molecule a Lewis base?
Answer» With what neutral molecules is $C l O^{-}$ isoelectronic? Is that molecule a Lewis base?

Discussion

50.	Which solution (Acid or Base) contains H+ions less than OH- ions ?
Answer» Which solution (Acid or Base) contains H+ions less than OH- ions ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following equations correctly represents the standard heat of formation of methane

The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because ...

The total number of hyperconjugative structures involving C - H bonds for the following Carbocation is CH3 − CH2 − ⊕CH − CH|CH3 − CH3

Which type of colloid has the particle size in between 1nm to 1000nm?

Assuming complete dissociatoin of solutes, calculate the pH of the solution obtained by mixing equal volumes of 2N5 NaOH and N5 HCl

If 2 moles of sugar are dissolved in 1000g of water, the elevation in boiling point of the resulting solution is: (Kb = 0.52 K kg mol-1):

Saccharin (Ka=2×10−12) is a weak acid represented by formula HSaC. 4×10−4 moles of saccharin are dissolved in 200 cc buffer of pH 3. Assuming no change in volume, calculate the concentration of saC−1 ions in the resulting solution at equilibrium. (Assume jpH of buffer is maintained)

Detection of nitrogen by Lassaigne's test .

In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion Ca2+ and fluoride ion (F−) are

Number of moles of Cr2O−27 required to oxidise one mole of ferrous ion completely in acidic medium.

During adiabatic expansion of an ideal gas

From 200 mg of CO2, 1021 molecules are removed. How many moles of CO2 are left?

x gm of water is mixed with 69 gm of ethanol. The mole fraction of ethanol in the resulting solution is 0.6. What is the value of 'x' in gm.

Calculate the useful work done during the reaction in kJ/mol. Ag(S)+12 Cl2(g)→AgCl(s) Given that E0Cl2/Cl−=+1.36V and E0Ag+|AgCl|Cl−=+0.220V PCl2=1 atm and T = 298 K

If M is the atomic mass and A is the mass, number, packing fraction is given by

If a saturated solution is prepared by dissolving Ag2CO3 in water has [Ag+]=2.56×10−4. What is the value of Ksp for Ag2CO3?

The value of nC01⋅2− nC12⋅3+ nC23⋅4+⋯+(−1)n nCn(n+1)⋅(n+2) is

The conjugate acid of (CH3)2 ¨NH is :

Why does cis-polyisoprene posses elastic property?

How many of the following are mixed anhydrides ? P4O10,CO,SO2,ClO2,Cl2O,N2O,NO2,Cl2O6,CO2,Cl2O7,SO3 __

Two glass bulbs of equal volumes are connected by a narrow tube and are filled with an ideal gas at 0∘C and a pressure of 76 cm of mercury. One of the bulbs is then placed in a water bath maintained at 62∘C. What is the new value of the pressure inside the bulbs?

5 ml of a gaseous hydrocarbon(CxHy) was exploded with 30 ml of oxygen. The resulting gas on cooling to room temperature is found to measure 25 ml of which 10 ml are absorbed by NaOH and the remainder by pyrogallol. The value of x+y is? ___

One mole of complex compound Co(NH3)5Cl3 gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO3 to yeild two moles of AgCl(S). The complex is:

Match the following: a) Lyman (r, t)p) visibleb) Balmer (p)q) Infraredc) Paschen (q, s)r) Ultravioletd) Brackett (q)s)n2=4,n1=3t)n2=5,n1=1

A certain laser transition emits 6.37×1015 quanta sec−1m−2. Calculate the power output in J sec−1 m−2. Given: λ=632.8 nm

In a cubic packed structure of a compound, the lattice is made up of oxide ions, one-fifth of the tetrahedral voids are occupied by X ions while half of the octahedral voids are occupied by Y ions. Then the formula of the oxide will be

Which of the following is not reasonable for an elimination reaction?

According to Freundlich adsorption isotherm, which of the following is correct?

How many litres of nitrogen gas is produced when 340 g of NH3 (Molar mass=17 g/mol) decomposes completely at STP?

Which of the following statements would be INCORRECT about this compounds?

The species which can best serve as an initiator for cationic polymerization is:

Number of moles of CH3MgBr consumed for one mole of given compound is:

Highly pure dilute solution of sodium in liquid ammonia

Which state of triply ionized beryllium (Be+++) has the same orbital radius as that of the ground state of hydrogen?

The correct order of mobility of alkali metal ions in aqueous solution is

The solubility product (Ksp) of the following compounds are given at 25∘C. The compound most soluble and least soluble coumpounds are: Compounds Ksp AgCl 1.1×10−10AgI 1.1×10−16PbCrO4 4.0×10−14Ag2CO3 8.0×10−12

Which pair of the following carbonyl compounds can be differentiated by I2/NaOH?

Which one of the following pairs of chemical species contains the ions having same hybridisation of the central atoms?

The structures of quartz, mica, asbestos have the common basic unit of-

The compound that does not produce nitrogen gas by thermal decomposition is:

Experimental molecular weight of acetic acid is _____ that of theoretical molecular weight.

The correct order in which the O−O bond length increases in the following is:

What are the functions performed by histamine in the body?

Given that: C(graphite)+ O2(g) →CO2(g) ΔH=x kJ mol−1 C(graphite)+ 12O2(g) →CO2(g) ΔH=y kJ mol−1 CO(g)+ 12O2(g) →CO2(g) ΔH=z kJ mol−1 Based on the given thermochemical equations, find out which one of the following algebric relationships is correct?

With what neutral molecules is ClO− isoelectronic? Is that molecule a Lewis base?

Which solution (Acid or Base) contains H+ions less than OH- ions ?