46295 + Interview Questions in Chemistry Page 15 InterviewSolution

701.	Assertion : Formaldehyde cannot be prepared by Rosenmund's reduction. Reason : Acid chlorides can be reduced into aldehydes with hydrogen in boiling xylene using palladium or platinum as a catalyst supported on barium sulphate. This is known as Rosenmund's reduction.
Answer» Assertion : Formaldehyde cannot be prepared by Rosenmund's reduction. Reason : Acid chlorides can be reduced into aldehydes with hydrogen in boiling xylene using palladium or platinum as a catalyst supported on barium sulphate. This is known as Rosenmund's reduction.

701.

Assertion : Formaldehyde cannot be prepared by Rosenmund's reduction. Reason : Acid chlorides can be reduced into aldehydes with hydrogen in boiling xylene using palladium or platinum as a catalyst supported on barium sulphate. This is known as Rosenmund's reduction.

Answer»

Assertion : Formaldehyde cannot be prepared by Rosenmund's reduction.

Reason : Acid chlorides can be reduced into aldehydes with hydrogen in boiling xylene using palladium or platinum as a catalyst supported on barium sulphate. This is known as Rosenmund's reduction.

Discussion

702.	16. The vapour pressure of pure benzene and toluene are 0.12 bar and 0.04 bar, respectively at 300K. A liquid mixture is composed of 1 mole, each of benzene and toluene. Q1 If the pressure over the mixture at 300 K is reduced at what pressure does the first vapour form. Q2 What is the mole fraction of benzene in the first trace of vapour formed ? Q3 If the pressure is further reduced , at what pressure does the last trace of liquid disappear ? Q4 What is the mole fraction of benzene in the last trace of liquid?
Answer» 16. The vapour pressure of pure benzene and toluene are 0.12 bar and 0.04 bar, respectively at 300K. A liquid mixture is composed of 1 mole, each of benzene and toluene. Q1 If the pressure over the mixture at 300 K is reduced at what pressure does the first vapour form. Q2 What is the mole fraction of benzene in the first trace of vapour formed ? Q3 If the pressure is further reduced , at what pressure does the last trace of liquid disappear ? Q4 What is the mole fraction of benzene in the last trace of liquid?

Discussion

703.	John teller distortion. Role in high and low spin complex
Answer» John teller distortion. Role in high and low spin complex

Discussion

704.	Which of the following is correct when the following equilibrium is established when C and water is placed in a container?C(s)+H2O(g)⇌CO(g)+H2(g)
Answer» Which of the following is correct when the following equilibrium is established when C and water is placed in a container? $C (s) + H_{2} O (g) ⇌ C O (g) + H_{2} (g)$

Discussion

705.	37. The ionic conductance of Ba2+ and Cl- are respectively 127 and 76 ohm-1 sq.cm at infinite dilution. The equivalent conductance of Bacl2 at infinite dilution will be (in ohm-1 sq.cm)
Answer» 37. The ionic conductance of Ba2+ and Cl- are respectively 127 and 76 ohm-1 sq.cm at infinite dilution. The equivalent conductance of Bacl2 at infinite dilution will be (in ohm-1 sq.cm)

Discussion

706.	75 What is the normality of 0.3 M H3PO4, When it undergoes the reaction as: H3PO4+2OH- reacts to HPO32-+2H2O
Answer» 75 What is the normality of 0.3 M H3PO4, When it undergoes the reaction as: H3PO4+2OH- reacts to HPO32-+2H2O

Discussion

707.	What happen when DIBAL react with aldehyde
Answer» What happen when DIBAL react with aldehyde

Discussion

708.	For a nth order reaction A→ Product, t1/2 varies with concentration of A as shown in graph What is value of n ?
Answer» For a $n^{t h}$ order reaction A→ Product, $t_{1 / 2}$ varies with concentration of A as shown in graph What is value of n ?

Discussion

709.	Calculate the fraction volume covered by atom which undergoes end centred packing.
Answer» Calculate the fraction volume covered by atom which undergoes end centred packing.

Discussion

710.	At what temperature, zinc and carbon have equal affinity for oxygen?
Answer» At what temperature, zinc and carbon have equal affinity for oxygen?

Discussion

711.	Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is (Atomic weight: Fe=55.85; S=32.00; O=16.00)
Answer» Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is (Atomic weight: Fe=55.85; S=32.00; O=16.00)

Discussion

712.	In a reaction A+B gives product rate is doubled when the concentration of B is doubled and the rate increases by a factor of 8 when the concentration of both the reac†an ts (A and B) are doubled rate law for the reaction can be written a aredoubled
Answer» In a reaction A+B gives product rate is doubled when the concentration of B is doubled and the rate increases by a factor of 8 when the concentration of both the reac†an ts (A and B) are doubled rate law for the reaction can be written a aredoubled

Discussion

713.	How is leaching carried out in case of low grade copper ores?
Answer» How is leaching carried out in case of low grade copper ores?

Discussion

714.	2 gram of a gas A is introduced into evacuated flask kept at 25 degree Celsius the pressure is found to be 1 ATM if 3 gram of another gas B is added to the same flask the total pressure becomes 1.5 ATM assume ideal gas behaviour the ratio of molecular weight of gas A to gas B is
Answer» 2 gram of a gas A is introduced into evacuated flask kept at 25 degree Celsius the pressure is found to be 1 ATM if 3 gram of another gas B is added to the same flask the total pressure becomes 1.5 ATM assume ideal gas behaviour the ratio of molecular weight of gas A to gas B is

Discussion

715.	in the presence of alumina catalyst two alcohol molecules will undergo dehydration and form what?
Answer» in the presence of alumina catalyst two alcohol molecules will undergo dehydration and form what?

Discussion

716.	Which of the following is least reactive towards SN1?
Answer» Which of the following is least reactive towards $S N^{1}$ ?

Discussion

717.	Describe some features of catalysis by zeolites. ?
Answer» Describe some features of catalysis by zeolites. ?

Discussion

718.	Theionization constant of propanoic acid is 1.32 × 10–5.Calculate the degree of ionization of the acid in its 0.05M solutionand also its pH. What will be its degree of ionization if thesolution is 0.01M in HCl also?
Answer» The ionization constant of propanoic acid is 1.32 × 10^–5. Calculate the degree of ionization of the acid in its 0.05M solution and also its pH. What will be its degree of ionization if the solution is 0.01M in HCl also?

Discussion

719.	3. Explain the mechanism of Allylic substitution in alkenes using NBS (N Bromo Succinimide)
Answer» 3. Explain the mechanism of Allylic substitution in alkenes using NBS (N Bromo Succinimide)

Discussion

720.	In the case homologous series of alkanes, which one of the following statements is incorrect
Answer» In the case homologous series of alkanes, which one of the following statements is incorrect

720.

In the case homologous series of alkanes, which one of the following statements is incorrect

Answer»

In the case homologous series of alkanes, which one of the following statements is incorrect

Discussion

721.	4. Give the reaction mechanism of preparing ketone from acid chloride by using dialalkylcadmium .
Answer» 4. Give the reaction mechanism of preparing ketone from acid chloride by using dialalkylcadmium .

Discussion

722.	The α - amino acids, usually exist in the form of zwitter ions. It means they have:
Answer» The α - amino acids, usually exist in the form of zwitter ions. It means they have:

Discussion

723.	Schottkydefect generally appears in[DCE 2004]
Answer» Schottky defect generally appears in [DCE 2004]

723.

Schottkydefect generally appears in[DCE 2004]

Answer»

Schottky
defect generally appears in

[DCE 2004]

Discussion

724.	The total number of stereoisomers of the compound CH3CH=CH-CH(OH)-CH=CH-CH3
Answer» The total number of stereoisomers of the compound CH3CH=CH-CH(OH)-CH=CH-CH3

Discussion

725.	A silicon specimen is made into a p-type semiconductor by doping on an average one indium per 5×10^7 silicon atoms. If the number density of atoms in the silicon specimen is 5×10^28 atm/m^3 then the number of acceptor atoms in silicon per cubic centimeter will be
Answer» A silicon specimen is made into a p-type semiconductor by doping on an average one indium per 5×10^7 silicon atoms. If the number density of atoms in the silicon specimen is 5×10^28 atm/m^3 then the number of acceptor atoms in silicon per cubic centimeter will be

Discussion

726.	The ratio of number of moles of O2 required to the number of moles of H2O produced during complete combustion of 1 mole of benzene is :
Answer» The ratio of number of moles of $O_{2}$ required to the number of moles of $H_{2} O$ produced during complete combustion of 1 mole of benzene is :

Discussion

727.	A sample of hard water contains 1 mg of CaCl2 and 1 mg MgCl2 per litre. Calculate the hardness of water in terms of CaCO3 present in per 106 parts of water.
Answer» A sample of hard water contains 1 mg of $C a C l_{2}$ and 1 mg $M g C l_{2}$ per litre. Calculate the hardness of water in terms of $C a C O_{3}$ present in per $10^{6}$ parts of water.

Discussion

728.	Specify the hybridization of the central atom in the following species respectively (N−3,NOCl,N2O):
Answer» Specify the hybridization of the central atom in the following species respectively $(N_{3}^{-}, N O C l, N_{2} O)$ :

Discussion

729.	Which shape has equal parts? Choose the correct option.
Answer» Which shape has equal parts? Choose the correct option.

Discussion

730.	35. 100ml of 0.1M NaCl solution is mixed with 100ml of 0.2M AgNO3 solution. Find the mass of AgCl precipitate formed.
Answer» 35. 100ml of 0.1M NaCl solution is mixed with 100ml of 0.2M AgNO3 solution. Find the mass of AgCl precipitate formed.

Discussion

731.	What will be the colour of red and blue litmus paper when they are dipped in a suspension of rust and water?
Answer» What will be the colour of red and blue litmus paper when they are dipped in a suspension of rust and water?

Discussion

732.	Which of the following molecules have (2R, 3-Z) configuration?
Answer» Which of the following molecules have (2R, 3-Z) configuration?

Discussion

733.	Newman representation of staggered propane is:
Answer» Newman representation of staggered propane is:

Discussion

734.	A mixture of KBr and NaBr weighing 0.560 g was treated with aq. Ag+ ion and all bromide ion was recovered as 0.970 g of pure AgBr. What was the fraction by weight of KBr in the sample?
Answer» A mixture of $K B r$ and $N a B r$ weighing 0.560 g was treated with aq. $A g^{+}$ ion and all bromide ion was recovered as 0.970 g of pure $A g B r .$ What was the fraction by weight of $K B r$ in the sample?

Discussion

735.	the ratio of moles of water as water of crystallisation in LiCl and BaCl_2 i
Answer» the ratio of moles of water as water of crystallisation in LiCl and BaCl_2 i

Discussion

736.	Identify the following compound:
Answer» Identify the following compound:

736.

Identify the following compound:

Answer»

Identify the following compound:

Discussion

737.	The C-C single bond distance is 1.54 A^°. What is the distance between the terminal carbons in propane?
Answer» The C-C single bond distance is 1.54 A^°. What is the distance between the terminal carbons in propane?

Discussion

738.	Equal volume of N2 and H2 react to form ammonia under suitable condition then the limiting reagent is? How to solve?
Answer» Equal volume of N2 and H2 react to form ammonia under suitable condition then the limiting reagent is? How to solve?

Discussion

739.	Which of the tubes in Figure (a) and (b) will be more effective as a condenser in the distillation apparatus? Fig(a) Fig(b)
Answer» Which of the tubes in Figure (a) and (b) will be more effective as a condenser in the distillation apparatus? Fig(a) Fig(b)

Discussion

740.	The metal calcium crystallizes in F.C.C unit cell with a = 600 pm. The density of metal if it contains 0.2% schottky deficits.
Answer» The metal calcium crystallizes in F.C.C unit cell with a = 600 pm. The density of metal if it contains $0.2 %$ schottky deficits.

Discussion

741.	Condition when NaNO2+HCl 1.nitroso compound2.Diazotisation3.-OH addition
Answer» Condition when NaNO2+HCl 1.nitroso compound 2.Diazotisation 3.-OH addition

Discussion

742.	The first ionisation potential of Na, Mg and Si are 496, 737, and 776 kJ mol−1 respectively. The ionisation potential of Al could be:
Answer» The first ionisation potential of $N a$ , $M g$ and $S i$ are 496, 737, and 776 $k J m o l^{- 1}$ respectively. The ionisation potential of $A l$ could be:

Discussion

743.	Arrange in increasing order of acid strength. HF,HCl,HBr,HI
Answer» Arrange in increasing order of acid strength. $H F, H C l, H B r, H I$

Discussion

744.	Which of the following compounds is not chiral?
Answer» Which of the following compounds is not chiral?

Discussion

745.	A doubly ionized lithium atom is hydrogen like with atomic number 3. If the product of speed and radius of the electron is new physical quantity ′K′, then the ratio of ′K′ in 3rd and 2nd orbit of Li++ is
Answer» A doubly ionized lithium atom is hydrogen like with atomic number 3. If the product of speed and radius of the electron is new physical quantity $^{'} K^{'}$ , then the ratio of $^{'} K^{'}$ in $3^{r d}$ and $2^{n d}$ orbit of $L i^{+ +}$ is

Discussion

746.	Which of the following compounds would be hydrolysed most easily?
Answer» Which of the following compounds would be hydrolysed most easily?

Discussion

747.	The unstable halide among the following is
Answer» The unstable halide among the following is

Discussion

748.	Two metal plates A and B are soldered together ad in fug. A=100cm^2, x1=x2=4mm,T1=120°C,T2=0°C. Thermal conductivity of A and B are 50 and 80 W/mK. The temperature of the soldered junction is
Answer» Two metal plates A and B are soldered together ad in fug. A=100cm^2, x1=x2=4mm,T1=120°C,T2=0°C. Thermal conductivity of A and B are 50 and 80 W/mK. The temperature of the soldered junction is

Discussion

749.	Which of the following will have sp2 hybridisation?
Answer» Which of the following will have $s p^{2}$ hybridisation?

Discussion

750.	Which of the following oxides shows electrical properties like metals ? (a) SiO2 (b) MgO (c) SO2()s (d) CrO2
Answer» Which of the following oxides shows electrical properties like metals ? (a) $S i O_{2}$ (b) MgO (c) $S O_{2} () s$ (d) $C r O_{2}$

750.

Which of the following oxides shows electrical properties like metals ? (a) SiO2 (b) MgO (c) SO2()s (d) CrO2

Answer»

Which of the following oxides shows electrical properties like metals ?

(a) $S i O_{2}$ (b) MgO (c) $S O_{2} () s$ (d) $C r O_{2}$

Discussion

Explore topic-wise InterviewSolutions in .

Assertion : Formaldehyde cannot be prepared by Rosenmund's reduction. Reason : Acid chlorides can be reduced into aldehydes with hydrogen in boiling xylene using palladium or platinum as a catalyst supported on barium sulphate. This is known as Rosenmund's reduction.

John teller distortion. Role in high and low spin complex

Which of the following is correct when the following equilibrium is established when C and water is placed in a container?C(s)+H2O(g)⇌CO(g)+H2(g)

37. The ionic conductance of Ba2+ and Cl- are respectively 127 and 76 ohm-1 sq.cm at infinite dilution. The equivalent conductance of Bacl2 at infinite dilution will be (in ohm-1 sq.cm)

75 What is the normality of 0.3 M H3PO4, When it undergoes the reaction as: H3PO4+2OH- reacts to HPO32-+2H2O

What happen when DIBAL react with aldehyde

For a nth order reaction A→ Product, t1/2 varies with concentration of A as shown in graph What is value of n ?

Calculate the fraction volume covered by atom which undergoes end centred packing.

At what temperature, zinc and carbon have equal affinity for oxygen?

Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wheat is (Atomic weight: Fe=55.85; S=32.00; O=16.00)

In a reaction A+B gives product rate is doubled when the concentration of B is doubled and the rate increases by a factor of 8 when the concentration of both the reac†an ts (A and B) are doubled rate law for the reaction can be written a aredoubled

How is leaching carried out in case of low grade copper ores?

2 gram of a gas A is introduced into evacuated flask kept at 25 degree Celsius the pressure is found to be 1 ATM if 3 gram of another gas B is added to the same flask the total pressure becomes 1.5 ATM assume ideal gas behaviour the ratio of molecular weight of gas A to gas B is

in the presence of alumina catalyst two alcohol molecules will undergo dehydration and form what?

Which of the following is least reactive towards SN1?

Describe some features of catalysis by zeolites. ?

Theionization constant of propanoic acid is 1.32 × 10–5.Calculate the degree of ionization of the acid in its 0.05M solutionand also its pH. What will be its degree of ionization if thesolution is 0.01M in HCl also?

3. Explain the mechanism of Allylic substitution in alkenes using NBS (N Bromo Succinimide)

In the case homologous series of alkanes, which one of the following statements is incorrect

4. Give the reaction mechanism of preparing ketone from acid chloride by using dialalkylcadmium .

The α - amino acids, usually exist in the form of zwitter ions. It means they have:

Schottkydefect generally appears in[DCE 2004]

The total number of stereoisomers of the compound CH3CH=CH-CH(OH)-CH=CH-CH3

A silicon specimen is made into a p-type semiconductor by doping on an average one indium per 5×10^7 silicon atoms. If the number density of atoms in the silicon specimen is 5×10^28 atm/m^3 then the number of acceptor atoms in silicon per cubic centimeter will be

The ratio of number of moles of O2 required to the number of moles of H2O produced during complete combustion of 1 mole of benzene is :

A sample of hard water contains 1 mg of CaCl2 and 1 mg MgCl2 per litre. Calculate the hardness of water in terms of CaCO3 present in per 106 parts of water.

Specify the hybridization of the central atom in the following species respectively (N−3,NOCl,N2O):

Which shape has equal parts? Choose the correct option.

35. 100ml of 0.1M NaCl solution is mixed with 100ml of 0.2M AgNO3 solution. Find the mass of AgCl precipitate formed.

What will be the colour of red and blue litmus paper when they are dipped in a suspension of rust and water?

Which of the following molecules have (2R, 3-Z) configuration?

Newman representation of staggered propane is:

A mixture of KBr and NaBr weighing 0.560 g was treated with aq. Ag+ ion and all bromide ion was recovered as 0.970 g of pure AgBr. What was the fraction by weight of KBr in the sample?

the ratio of moles of water as water of crystallisation in LiCl and BaCl_2 i

Identify the following compound:

The C-C single bond distance is 1.54 A^°. What is the distance between the terminal carbons in propane?

Equal volume of N2 and H2 react to form ammonia under suitable condition then the limiting reagent is? How to solve?

Which of the tubes in Figure (a) and (b) will be more effective as a condenser in the distillation apparatus? Fig(a) Fig(b)

The metal calcium crystallizes in F.C.C unit cell with a = 600 pm. The density of metal if it contains 0.2% schottky deficits.

Condition when NaNO2+HCl 1.nitroso compound2.Diazotisation3.-OH addition

The first ionisation potential of Na, Mg and Si are 496, 737, and 776 kJ mol−1 respectively. The ionisation potential of Al could be:

Arrange in increasing order of acid strength. HF,HCl,HBr,HI

Which of the following compounds is not chiral?

A doubly ionized lithium atom is hydrogen like with atomic number 3. If the product of speed and radius of the electron is new physical quantity ′K′, then the ratio of ′K′ in 3rd and 2nd orbit of Li++ is

Which of the following compounds would be hydrolysed most easily?

The unstable halide among the following is

Two metal plates A and B are soldered together ad in fug. A=100cm^2, x1=x2=4mm,T1=120°C,T2=0°C. Thermal conductivity of A and B are 50 and 80 W/mK. The temperature of the soldered junction is

Which of the following will have sp2 hybridisation?

Which of the following oxides shows electrical properties like metals ? (a) SiO2 (b) MgO (c) SO2()s (d) CrO2