46295 + Interview Questions in Chemistry

1.	How to determine groups of different element?
Answer» How to determine groups of different element?

Discussion

2.	Thevalue of Kcforthe reaction 3O2(g) 2O3(g) is2.0 ×10–50at 25°C. If the equilibrium concentration of O2in air at 25°C is 1.6 ×10–2,what is the concentration of O3?
Answer» The value of K_cfor the reaction 3 O₂ (g) 2 O₃ (g) is 2.0 ×10^–50 at 25°C. If the equilibrium concentration of O₂ in air at 25°C is 1.6 ×10^–2, what is the concentration of O₃?

2.

Thevalue of Kcforthe reaction 3O2(g) 2O3(g) is2.0 ×10–50at 25°C. If the equilibrium concentration of O2in air at 25°C is 1.6 ×10–2,what is the concentration of O3?

Answer»

The
value of K_cfor
the reaction

3
O₂
(g)

2
O₃
(g)

is
2.0 ×10^–50
at 25°C. If the equilibrium concentration of O₂
in air at 25°C is 1.6 ×10^–2,
what is the concentration of O₃?

Discussion

3.	calculate the mass of MnO2 needed to produce 1.78 litres of chlorine gas at STP according to the equationMnO2 + 4HCl → MnCl2 + 2H2O + Cl2[H = 1, Cl = 35.5, Mn = 54.9]
Answer» calculate the mass of $M n O_{2}$ needed to produce 1.78 litres of chlorine gas at STP according to the equation $M n O_{2}$ + 4HCl $\to$ $M n C l_{2}$ + 2 $H_{2} O$ + $C l_{2}$ [H = 1, Cl = 35.5, Mn = 54.9]

3.

calculate the mass of MnO2 needed to produce 1.78 litres of chlorine gas at STP according to the equationMnO2 + 4HCl → MnCl2 + 2H2O + Cl2[H = 1, Cl = 35.5, Mn = 54.9]

Answer»

calculate the mass of $M n O_{2}$ needed to produce 1.78 litres of chlorine gas at STP according to the equation

$M n O_{2}$ + 4HCl $\to$ $M n C l_{2}$ + 2 $H_{2} O$ + $C l_{2}$

[H = 1, Cl = 35.5, Mn = 54.9]

Discussion

4.	14. which of the following has lowest melting point? a)CaBr2 b)CaF2 c)CaCl2 d)Cal2
Answer» 14. which of the following has lowest melting point? a)CaBr2 b)CaF2 c)CaCl2 d)Cal2

Discussion

5.	If 300g of 25% solution is mixed with 400g of 40% solution. Then find out mass percentage of each component of the mixture
Answer» If 300g of 25% solution is mixed with 400g of 40% solution. Then find out mass percentage of each component of the mixture

Discussion

6.	A potassium crystallizes in a body centred cubic lattice.How many untib celsare preent in 2g potassium
Answer» A potassium crystallizes in a body centred cubic lattice.How many untib celsare preent in 2g potassium

Discussion

7.	A C-type Bourdon tube is used to measure pressure in a pipe and it indicates a pressure of 10 kPa. If atmospheric pressure is 101.3 kPa. Then the absolute pressure in the pipe (in kPa) is
Answer» A C-type Bourdon tube is used to measure pressure in a pipe and it indicates a pressure of $10 k P a$ . If atmospheric pressure is $101.3 k P a$ . Then the absolute pressure in the pipe (in kPa) is

Discussion

8.	What is heterxylous and homozygous wood ? What is meaning of isomorphic?
Answer» What is heterxylous and homozygous wood ? What is meaning of isomorphic?

Discussion

9.	The volume strength of 3N H2O2 is:
Answer» The volume strength of $3 N H_{2} O_{2}$ is:

Discussion

10.	19. A hydrocarbon consisting of 85.7% carbon if 42 mg compound has 3.01×10 20 atom then what is the combination of the compound? (1) C12H24 (2 ) C2H4 (3) C3H6 (4 )C6H12
Answer» 19. A hydrocarbon consisting of 85.7% carbon if 42 mg compound has 3.01×10 20 atom then what is the combination of the compound? (1) C12H24 (2 ) C2H4 (3) C3H6 (4 )C6H12

Discussion

11.	Product (A) is[0.77 Mark]
Answer» Product (A) is [0.77 Mark]

Discussion

12.	nt10 gms of ice at -10 deg c is mixed with 100 gm of water at 50 deg c contained in a calorimetr weighing 50 gm. (Specific heat of water = 1 cal/gm, Latent heat = 80 cal/gm, specific heat of ice = 0.5 cal/gam/deg c and the specific heat of copper = 0.09 cal/gm/deg c. The final temperature reached by the mixturen
Answer» nt10 gms of ice at -10 deg c is mixed with 100 gm of water at 50 deg c contained in a calorimetr weighing 50 gm. (Specific heat of water = 1 cal/gm, Latent heat = 80 cal/gm, specific heat of ice = 0.5 cal/gam/deg c and the specific heat of copper = 0.09 cal/gm/deg c. The final temperature reached by the mixturen

Discussion

13.	Compare 1st, 2nd and 3rd ionisation enthalpy of Li,Be,B and C separately.
Answer» Compare 1st, 2nd and 3rd ionisation enthalpy of Li,Be,B and C separately.

Discussion

14.	what are the formulas to find out pH of solutions with different combinations of weak/strong acid/base
Answer» what are the formulas to find out pH of solutions with different combinations of weak/strong acid/base

Discussion

15.	सेठ ने किस रंग में कपड़ा रंगने को कहा?
Answer» सेठ ने किस रंग में कपड़ा रंगने को कहा?

Discussion

16.	Splicing of RNA is linking of
Answer» Splicing of RNA is linking of

Discussion

17.	Are iso and sec propyl structure s are same
Answer» Are iso and sec propyl structure s are same

Discussion

18.	19. Reaction of phenol with PBr3? With mechanism and through which path does it go through
Answer» 19. Reaction of phenol with PBr3? With mechanism and through which path does it go through

Discussion

19.	In Nacl type structure, the coordination number of Na+ and Cl- are:
Answer» In Nacl type structure, the coordination number of Na+ and Cl- are:

Discussion

20.	For a reaction A+B-products, the rate of reaction was double when the concentration of A was double,the rate was again double when the conc. of A and B were doubled the order of the reaction with respect A and B are?
Answer» For a reaction A+B-products, the rate of reaction was double when the concentration of A was double,the rate was again double when the conc. of A and B were doubled the order of the reaction with respect A and B are?

Discussion

21.	For the reaction, N204 (9)2NO2(9), the 2 rate of disappearance of NO2 will be
Answer» For the reaction, N204 (9)2NO2(9), the 2 rate of disappearance of NO2 will be

Discussion

22.	Considering the elements F,Cl,O and S, the correct order of their electron affinity values is:
Answer» Considering the elements $F, C l, O and S$ , the correct order of their electron affinity values is:

Discussion

23.	What will be the product of the following reaction CaCO3(s)+ (NH4) 2C2O4(aq)+ 2NH4OH(aq) ---> ?
Answer» What will be the product of the following reaction CaCO3(s)+ (NH4) 2C2O4(aq)+ 2NH4OH(aq) ---> ?

Discussion

24.	23 Rules for nomenclature of aromatic hydrocarbons?
Answer» 23 Rules for nomenclature of aromatic hydrocarbons?

Discussion

25.	How many of the following statments are correct regarding Claisen condensation reaction (when an ester is treated with a strong base)? 1. A proton is removed from the α -carbon to form a resonance stabilised carbanion of the ester.2. Carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule.3. A new C−C bond is formed.4. α,β unsaturated product is obtained
Answer» How many of the following statments are correct regarding Claisen condensation reaction (when an ester is treated with a strong base)? 1. A proton is removed from the $α$ -carbon to form a resonance stabilised carbanion of the ester. 2. Carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule. 3. A new $C - C$ bond is formed. 4. $α, β$ unsaturated product is obtained

Discussion

26.	correct statements for carbonyl compound in 1.lower member of aldehyde and ketone are water soluble because they form H bond with water2.carbonyl compund have in between boiling point to that of alcohol and ether of same molecular mass3.in nucleophilic addition reaction of carbonyl compund when new chiral center is generated the racemic mixture of product is form4.formalin is aqueous solution of equimolar amnt. of formic and acetic acid
Answer» correct statements for carbonyl compound in 1.lower member of aldehyde and ketone are water soluble because they form H bond with water 2.carbonyl compund have in between boiling point to that of alcohol and ether of same molecular mass 3.in nucleophilic addition reaction of carbonyl compund when new chiral center is generated the racemic mixture of product is form 4.formalin is aqueous solution of equimolar amnt. of formic and acetic acid

Discussion

27.	8. Explain dipole moment with direction in cis n2f2
Answer» 8. Explain dipole moment with direction in cis n2f2

Discussion

28.	Product "A" in the below chemical reaction is:
Answer» Product "A" in the below chemical reaction is:

Discussion

29.	82. What will be the de Broglie wavelength of an electronic revolving in n=6 of H atom? (r= Bohr radius) 1. πr 2. 12πr 3. 6πr 4. 24πr
Answer» 82. What will be the de Broglie wavelength of an electronic revolving in n=6 of H atom? (r= Bohr radius) 1. πr 2. 12πr 3. 6πr 4. 24πr

Discussion

30.	polymerization of iso butene is mostly initiated by 1) cation 2)anion 3)free radicl
Answer» polymerization of iso butene is mostly initiated by 1) cation 2)anion 3)free radicl

Discussion

31.	In H2−O2 fuel cell the reaction occuring at cathode is:
Answer» In $H_{2} - O_{2}$ fuel cell the reaction occuring at cathode is:

Discussion

32.	The composition of air inhaled by a human is 21% O2 by volume and 0.03% CO2 and that of exhaled air is 16% O2 and 4.03% CO2. Assuming a typical volume of 6200 L day−1, moles of O2 used and CO2 generated by the body at 37 ∘C and 1.00 bar are:(Assume ideal behaviour)
Answer» The composition of air inhaled by a human is $21 % O_{2}$ by volume and $0.03 % C O_{2}$ and that of exhaled air is $16 % O_{2}$ and $4.03 % C O_{2}$ . Assuming a typical volume of $6200 {L day}^{- 1}$ , moles of $O_{2}$ used and $C O_{2}$ generated by the body at $37^{\circ} C$ and $1.00 b a r$ are: (Assume ideal behaviour)

Discussion

33.	metallic gold crystalises in fcc lattice with edge length 4.07 pm . the closest distance between gold atoms is?
Answer» metallic gold crystalises in fcc lattice with edge length 4.07 pm . the closest distance between gold atoms is?

Discussion

34.	Which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?
Answer» Which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

Discussion

35.	In general, Red Phosphorus is regarded to be unreactive at room temperature. Also it is commonly known that white Phosphorus is highly reactive at room temperature. What do you think will happen when Bromine is added to Red Phosphorus at room temperature?
Answer» In general, Red Phosphorus is regarded to be unreactive at room temperature. Also it is commonly known that white Phosphorus is highly reactive at room temperature. What do you think will happen when Bromine is added to Red Phosphorus at room temperature?

Discussion

36.	Which of the following molecule have a centre of symmetry?
Answer» Which of the following molecule have a centre of symmetry?

Discussion

37.	In which of the following compound(s) nitrogen can be detected by Lassaigne’s test?
Answer» In which of the following compound(s) nitrogen can be detected by Lassaigne’s test?

Discussion

38.	In Nessler’s reagent, the active ion is:
Answer» In Nessler’s reagent, the active ion is:

Discussion

39.	30. Addition of HBr to 2-methyl-1-propene in thepresence of hydrogen peroxide produces(1) 1-Bromobutane(2) 2-Bromopropane(3) 2-Bromo-2-methylpropane(4) 1-Bromo-2-methylpropane
Answer» 30. Addition of HBr to 2-methyl-1-propene in the presence of hydrogen peroxide produces (1) 1-Bromobutane (2) 2-Bromopropane (3) 2-Bromo-2-methylpropane (4) 1-Bromo-2-methylpropane

Discussion

40.	Acetic anhydride with ethanamine gives the product:
Answer» Acetic anhydride with ethanamine gives the product:

Discussion

41.	The distinguishing test between methanoic acid and ethanoic acid is
Answer» The distinguishing test between methanoic acid and ethanoic acid is

Discussion

42.	Which of the following is a branched polymer?
Answer» Which of the following is a branched polymer?

Discussion

43.	Find the number of compounds which does not possess a plane of symmetry.
Answer» Find the number of compounds which does not possess a plane of symmetry.

Discussion

44.	How many stereoisomers are possible for 1,2,3,4,5 pentamethyl cyclohexane ?
Answer» How many stereoisomers are possible for 1,2,3,4,5 pentamethyl cyclohexane ?

Discussion

45.	38. number of nodal plane in the molecular orbitals of 1) 1s + 1s 2) 1s - 1s 3) 2pz + 2pz 4) 2pz - 2pz
Answer» 38. number of nodal plane in the molecular orbitals of 1) 1s + 1s 2) 1s - 1s 3) 2pz + 2pz 4) 2pz - 2pz

Discussion

46.	what is primary and secondary valencies?
Answer» what is primary and secondary valencies?

Discussion

47.	15 When an electric current is passed through acidulated water ,112ml of hydrogen gas at NTP is collected at the cathode in 965 seconds . The current passed in amperes is?
Answer» 15 When an electric current is passed through acidulated water ,112ml of hydrogen gas at NTP is collected at the cathode in 965 seconds . The current passed in amperes is?

Discussion

48.	Gold number of haemoglobin is 0.03. Hence 100 ml of gold sol will require haemoglobin in what quantity so that gold is not coagulated by 10ml 10% NaCl solution
Answer» Gold number of haemoglobin is 0.03. Hence 100 ml of gold sol will require haemoglobin in what quantity so that gold is not coagulated by 10ml 10% NaCl solution

Discussion

49.	What is the product when Neopentyl alcohol is treated with HBr?
Answer» What is the product when Neopentyl alcohol is treated with HBr?

Discussion

50.	14. the lowering of vapour pressure of 0.1M aqueous solutions of NaCl , K2SO4 and CuSO4 are a) all equal b) in the ratio of 1:1:1.5
Answer» 14. the lowering of vapour pressure of 0.1M aqueous solutions of NaCl , K2SO4 and CuSO4 are a) all equal b) in the ratio of 1:1:1.5

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How to determine groups of different element?

Thevalue of Kcforthe reaction 3O2(g) 2O3(g) is2.0 ×10–50at 25°C. If the equilibrium concentration of O2in air at 25°C is 1.6 ×10–2,what is the concentration of O3?

calculate the mass of MnO2 needed to produce 1.78 litres of chlorine gas at STP according to the equationMnO2 + 4HCl → MnCl2 + 2H2O + Cl2[H = 1, Cl = 35.5, Mn = 54.9]

14. which of the following has lowest melting point? a)CaBr2 b)CaF2 c)CaCl2 d)Cal2

If 300g of 25% solution is mixed with 400g of 40% solution. Then find out mass percentage of each component of the mixture

A potassium crystallizes in a body centred cubic lattice.How many untib celsare preent in 2g potassium

A C-type Bourdon tube is used to measure pressure in a pipe and it indicates a pressure of 10 kPa. If atmospheric pressure is 101.3 kPa. Then the absolute pressure in the pipe (in kPa) is

What is heterxylous and homozygous wood ? What is meaning of isomorphic?

The volume strength of 3N H2O2 is:

19. A hydrocarbon consisting of 85.7% carbon if 42 mg compound has 3.01×10 20 atom then what is the combination of the compound? (1) C12H24 (2 ) C2H4 (3) C3H6 (4 )C6H12

Product (A) is[0.77 Mark]

Compare 1st, 2nd and 3rd ionisation enthalpy of Li,Be,B and C separately.

what are the formulas to find out pH of solutions with different combinations of weak/strong acid/base

सेठ ने किस रंग में कपड़ा रंगने को कहा?

Splicing of RNA is linking of

Are iso and sec propyl structure s are same

19. Reaction of phenol with PBr3? With mechanism and through which path does it go through

In Nacl type structure, the coordination number of Na+ and Cl- are:

For a reaction A+B-products, the rate of reaction was double when the concentration of A was double,the rate was again double when the conc. of A and B were doubled the order of the reaction with respect A and B are?

For the reaction, N204 (9)2NO2(9), the 2 rate of disappearance of NO2 will be

Considering the elements F,Cl,O and S, the correct order of their electron affinity values is:

What will be the product of the following reaction CaCO3(s)+ (NH4) 2C2O4(aq)+ 2NH4OH(aq) ---> ?

23 Rules for nomenclature of aromatic hydrocarbons?

8. Explain dipole moment with direction in cis n2f2

Product "A" in the below chemical reaction is:

82. What will be the de Broglie wavelength of an electronic revolving in n=6 of H atom? (r= Bohr radius) 1. πr 2. 12πr 3. 6πr 4. 24πr

polymerization of iso butene is mostly initiated by 1) cation 2)anion 3)free radicl

In H2−O2 fuel cell the reaction occuring at cathode is:

The composition of air inhaled by a human is 21% O2 by volume and 0.03% CO2 and that of exhaled air is 16% O2 and 4.03% CO2. Assuming a typical volume of 6200 L day−1, moles of O2 used and CO2 generated by the body at 37 ∘C and 1.00 bar are:(Assume ideal behaviour)

metallic gold crystalises in fcc lattice with edge length 4.07 pm . the closest distance between gold atoms is?

Which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

In general, Red Phosphorus is regarded to be unreactive at room temperature. Also it is commonly known that white Phosphorus is highly reactive at room temperature. What do you think will happen when Bromine is added to Red Phosphorus at room temperature?

Which of the following molecule have a centre of symmetry?

In which of the following compound(s) nitrogen can be detected by Lassaigne’s test?

In Nessler’s reagent, the active ion is:

30. Addition of HBr to 2-methyl-1-propene in thepresence of hydrogen peroxide produces(1) 1-Bromobutane(2) 2-Bromopropane(3) 2-Bromo-2-methylpropane(4) 1-Bromo-2-methylpropane

Acetic anhydride with ethanamine gives the product:

The distinguishing test between methanoic acid and ethanoic acid is

Which of the following is a branched polymer?

Find the number of compounds which does not possess a plane of symmetry.

How many stereoisomers are possible for 1,2,3,4,5 pentamethyl cyclohexane ?

38. number of nodal plane in the molecular orbitals of 1) 1s + 1s 2) 1s - 1s 3) 2pz + 2pz 4) 2pz - 2pz

what is primary and secondary valencies?

15 When an electric current is passed through acidulated water ,112ml of hydrogen gas at NTP is collected at the cathode in 965 seconds . The current passed in amperes is?

Gold number of haemoglobin is 0.03. Hence 100 ml of gold sol will require haemoglobin in what quantity so that gold is not coagulated by 10ml 10% NaCl solution

What is the product when Neopentyl alcohol is treated with HBr?

14. the lowering of vapour pressure of 0.1M aqueous solutions of NaCl , K2SO4 and CuSO4 are a) all equal b) in the ratio of 1:1:1.5