46295 + Interview Questions in Chemistry

1.	The equivalent mass of dichromate in acid medium is (Cr = 52 u):
Answer» The equivalent mass of dichromate in acid medium is (Cr = 52 u):

Discussion

2.	For a monoatomic gas kinetic energy = E. The relation with R.M.S velocity is
Answer» For a monoatomic gas kinetic energy = E. The relation with R.M.S velocity is

Discussion

3.	The molar heat capacity of water at constant pressure P is 75JK−1 mol−1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is:
Answer» The molar heat capacity of water at constant pressure P is $75 J K^{- 1} m o l^{- 1}$ . When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is:

Discussion

4.	Why do some elements like carbon have different oxidation states in different elements whereas some elements like oxygen have a fixed oxidation number?
Answer» Why do some elements like carbon have different oxidation states in different elements whereas some elements like oxygen have a fixed oxidation number?

Discussion

5.	The electronic configuration of four elements L, P, Q and R are given in brackets (1s2,2s22p4);Q(1s2,2s22p6,3s23p5),p(1s2,2s22p6,3s1);R(1s22s62p6,3s2). The formulae of ionic compounds that can be formed between these elements are
Answer» The electronic configuration of four elements L, P, Q and R are given in brackets $(1 s^{2}, 2 s^{2} 2 p^{4}); Q (1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5}), p (1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{1}); R (1 s^{2} 2 s^{6} 2 p^{6}, 3 s^{2})$ . The formulae of ionic compounds that can be formed between these elements are

Discussion

6.	Why does the molecularity of reactions usually range between 0 and 4 ?
Answer» Why does the molecularity of reactions usually range between 0 and 4 ?

Discussion

7.	Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.5 g per mL and the mass percent of nitric acid in it being 69%.
Answer» Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.5 g per mL and the mass percent of nitric acid in it being 69%.

Discussion

8.	What are the molecules which concentrate and accumulate on the surface called:
Answer» What are the molecules which concentrate and accumulate on the surface called:

Discussion

9.	Rhizobium and Rhodospirillum
Answer» Rhizobium and Rhodospirillum

Discussion

10.	Major product for the above reaction is :
Answer» Major product for the above reaction is :

Discussion

11.	When K2Cr2O7 is heated with conc. H2SO4 in the presence of a soluble metal chloride, orange red vapours are produced. These are due to
Answer» When $K_{2} C r_{2} O_{7}$ is heated with conc. $H_{2} S O_{4}$ in the presence of a soluble metal chloride, orange red vapours are produced. These are due to

Discussion

12.	For a monoatomic gas, if the specific heat for a process is C=5R2, then density v/s temperature graph for the process will be:
Answer» For a monoatomic gas, if the specific heat for a process is $C = \frac{5 R}{2},$ then density v/s temperature graph for the process will be:

Discussion

13.	A container contains 0.2 mol of CO2 and 0.1 mol H2 and establish following equilibrium. CO2(g)+H2(g)⇌CO(g)+H2O(g). At equlibrium H2O is found to be 25% by mol. The equilibrium constant Kp for the reaction is
Answer» A container contains $0.2 m o l$ of $C O_{2}$ and $0.1 m o l$ $H_{2}$ and establish following equilibrium. $C O_{2} (g) + H_{2} (g) ⇌ C O (g) + H_{2} O (g)$ . At equlibrium $H_{2} O$ is found to be 25% by mol. The equilibrium constant $K p$ for the reaction is

Discussion

14.	A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as :
Answer» A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as :

Discussion

15.	Which of the following is true about the charge acquired by P-type semiconductors ? (a) Positive (b) Neutral (c) Negative (d) Depends on concentration of p impurity
Answer» Which of the following is true about the charge acquired by P-type semiconductors ? (a) Positive (b) Neutral (c) Negative (d) Depends on concentration of p impurity

15.

Which of the following is true about the charge acquired by P-type semiconductors ? (a) Positive (b) Neutral (c) Negative (d) Depends on concentration of p impurity

Answer»

Which of the following is true about the charge acquired by P-type semiconductors ?

(a) Positive (b) Neutral

(c) Negative (d) Depends on concentration of p impurity

Discussion

16.	List gases which are responsible for greenhouse effect.
Answer» List gases which are responsible for greenhouse effect.

Discussion

17.	Calculate the maximum work done (in cal) when pressure on 10 gram of hydrogen is reduced from 20 to 1 atm at a constant temperature of 273 K. the gas behave Ideally
Answer» Calculate the maximum work done (in $c a l$ ) when pressure on 10 gram of hydrogen is reduced from $20$ to $1 a t m$ at a constant temperature of $273 K$ . the gas behave Ideally

Discussion

18.	Why does the reactivity of nitrogen differ from phosphorus?
Answer» Why does the reactivity of nitrogen differ from phosphorus?

Discussion

19.	Find the pH of a 0.002 N acetic acid solution if it is 2.5% ionised at a given dilution. (take log 3 = 0.5, log 5 = 0.7)
Answer» Find the pH of a $0.002 N$ acetic acid solution if it is $2.5$ % ionised at a given dilution. (take log 3 = 0.5, log 5 = 0.7)

Discussion

20.	The spin angular momentum for the ′s′ electron in H−atom is:
Answer» The spin angular momentum for the $^{'} s^{'}$ electron in $H - a t o m$ is:

Discussion

21.	The major products of the following reaction ZnS(s)+O2(g)heat−−−−→ Are
Answer» The major products of the following reaction $Z n S (s) + O_{2} (g) h e a t - --- \to$ Are

21.

The major products of the following reaction ZnS(s)+O2(g)heat−−−−→ Are

Answer»

The major products of the following reaction

$Z n S (s) + O_{2} (g) h e a t - --- \to$

Are

Discussion

22.	Calculate the total work done along the path 'ABCD' (as shown in figure) for a one mole of monoatomic gas.
Answer» Calculate the total work done along the path 'ABCD' (as shown in figure) for a one mole of monoatomic gas.

Discussion

23.	Which of the following expressions for the percentage ionization of a monoacidic base (BOH) in an aqueous solution at appreciable concentration is not correct?
Answer» Which of the following expressions for the percentage ionization of a monoacidic base $(B O H)$ in an aqueous solution at appreciable concentration is not correct?

Discussion

24.	1.20 g sample of Na2CO3 and K2CO3 was dissolved in water to form 100 mL of a solution. 20 mL of this solution required 40 mL of 0.1 N HCl for complete neutralization. Calculate the weight of precipitate in the mixture if another 20 mL of this solution is treated with excess of BaCl2.
Answer» $1.20 g$ sample of $N a_{2} C O_{3}$ and $K_{2} C O_{3}$ was dissolved in water to form $100 m L$ of a solution. $20 m L$ of this solution required $40 m L$ of $0.1 N H C l$ for complete neutralization. Calculate the weight of precipitate in the mixture if another $20 m L$ of this solution is treated with excess of $B a C l_{2}$ .

Discussion

25.	The major product for the given reaction is :
Answer» The major product for the given reaction is :

Discussion

26.	A new flurocarbon of molar mass 102 g/mol was placed in a electrically heated vessel. When the pressure was 650 torr, the liquid boiled at 57oC. After the boiling point had been reached it was found that a current of 0.25 A from a 12 V supply passed for 600 s vapourises 1.8 g of the sample. (Take R=253 J/molK)
Answer» A new flurocarbon of molar mass $102 g/mol$ was placed in a electrically heated vessel. When the pressure was $650 torr$ , the liquid boiled at $57^{o} C$ . After the boiling point had been reached it was found that a current of $0.25 A$ from a $12 V$ supply passed for $600 s$ vapourises $1.8 g$ of the sample. $(Take R = \frac{25}{3} J/molK$ )

Discussion

27.	During an adiabatic process the pressure of the gas is found to be proportional to the cube of the absolute temperature. The ratio CPCV=γ for the gas is:
Answer» During an adiabatic process the pressure of the gas is found to be proportional to the cube of the absolute temperature. The ratio $\frac{C_{P}}{C_{V}} = γ$ for the gas is:

Discussion

28.	Which is the strongest conjugate base? The options are, (CH3)3CO , (CH3)2CHO , CH3CH2O, CH3O
Answer» Which is the strongest conjugate base? The options are, (CH3)3CO , (CH3)2CHO , CH3CH2O, CH3O

Discussion

29.	Among [Ni(Co)4], [NiCl4]2−, [Co(NH3)4Cl2]Cl, Na2[CoF6]3+, Na2O2 and CsO2, the total number of paramagnetic compounds is
Answer» Among $[N i (C o)_{4}], [N i C l_{4}]^{2 -}, [C o (N H_{3})_{4} C l_{2}] C l, N a_{2} [C o F_{6}]^{3 +}, N a_{2} O_{2} a n d C s O_{2},$ the total number of paramagnetic compounds is

Discussion

30.	Explain thermal insulator
Answer» Explain thermal insulator

Discussion

31.	Is gallium solid or liquid
Answer» Is gallium solid or liquid

Discussion

32.	A compound MpXq has ccp arrangment of X.Its unit cell structure is shown.......Find emperical formula? (IIT-JEE 2012)
Answer» A compound MpXq has ccp arrangment of X.Its unit cell structure is shown.......Find emperical formula? (IIT-JEE 2012)

32.

A compound MpXq has ccp arrangment of X.Its unit cell structure is shown.......Find emperical formula? (IIT-JEE 2012)

Answer»

A compound MpXq has ccp arrangment of X.Its unit cell structure is shown.......Find emperical formula?

(IIT-JEE 2012)

Discussion

33.	The sulphate of an element contains 42.2%of element . The equivalent weight of the element would be A)17. C)51 B)35. D)68
Answer» The sulphate of an element contains 42.2%of element . The equivalent weight of the element would be A)17. C)51 B)35. D)68

33.

The sulphate of an element contains 42.2%of element . The equivalent weight of the element would be A)17. C)51 B)35. D)68

Answer»

The sulphate of an element contains 42.2%of element . The equivalent weight of the element would be

A)17. C)51

B)35. D)68

Discussion

34.	Which of the following hydrogen halides react(s) with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq)?
Answer» Which of the following hydrogen halides react(s) with $A g N O_{3} (a q)$ to give a precipitate that dissolves in $N a_{2} S_{2} O_{3} (a q)$ ?

Discussion

35.	What is the volume of 6g of hydrogen at 1.5atm and 273∘C?
Answer» What is the volume of 6g of hydrogen at 1.5atm and $273^{\circ} C$ ?

Discussion

36.	In the following reaction sequence, The major product B is:
Answer» In the following reaction sequence, The major product B is:

Discussion

37.	In a nuclear reactor, energy is produced by the following process: 1H2+1H2→1H3+P1H3+1H2→2He4+n The reactor produces a power of 1010 MW with 50% efficiency. The number of deutrons required to run the reactor for one year will be apporoximately: m(12H) = 2.014 u. m(p) = 1.007 u. m(n) = 1.008u. m(2He4) = 4.00 1u
Answer» In a nuclear reactor, energy is produced by the following process: $_{1} H^{2} +_{1} H^{2} \to_{1} H^{3} + P_{1} H^{3} +_{1} H^{2} \to_{2} H e^{4} + n$ The reactor produces a power of $10^{10}$ MW with 50% efficiency. The number of deutrons required to run the reactor for one year will be apporoximately: $m (1_{H}^{2})$ = 2.014 u. m(p) = 1.007 u. m(n) = 1.008u. $m (2_{H} e^{4})$ = 4.00 1u

37.

In a nuclear reactor, energy is produced by the following process: 1H2+1H2→1H3+P1H3+1H2→2He4+n The reactor produces a power of 1010 MW with 50% efficiency. The number of deutrons required to run the reactor for one year will be apporoximately: m(12H) = 2.014 u. m(p) = 1.007 u. m(n) = 1.008u. m(2He4) = 4.00 1u

Answer»

In a nuclear reactor, energy is produced by the following process:

$_{1} H^{2} +_{1} H^{2} \to_{1} H^{3} + P_{1} H^{3} +_{1} H^{2} \to_{2} H e^{4} + n$

The reactor produces a power of $10^{10}$ MW with 50% efficiency. The number of deutrons required to run the reactor for one year will be apporoximately: $m (1_{H}^{2})$ = 2.014 u. m(p) = 1.007 u. m(n) = 1.008u. $m (2_{H} e^{4})$ = 4.00 1u

Discussion

38.	The hybridization of central atom in dimer of BH3 and BeH2 is:
Answer» The hybridization of central atom in dimer of $B H_{3}$ and $B e H_{2}$ is:

Discussion

39.	The formal charge on the phosphorous atom in PO3−4 ion is:
Answer» The formal charge on the phosphorous atom in $P O_{4}^{3 -}$ ion is:

Discussion

40.	Why does the Rutherford model not explain absorption or emission spectrum??
Answer» Why does the Rutherford model not explain absorption or emission spectrum??

Discussion

41.	Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: In metal excess defect
Answer» Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: In metal excess defect

41.

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: In metal excess defect

Answer»

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

Question: In metal excess defect

Discussion

42.	Extrinsic semiconductor made from intrinsic semiconductor by -
Answer» Extrinsic semiconductor made from intrinsic semiconductor by -

Discussion

43.	The number of isoelectronic species among the following are: Ca2+, Ar, Cl−, K+, Kr, F−
Answer» The number of isoelectronic species among the following are: $C a^{2 +}, A r, C l^{-}, K^{+}, K r, F^{-}$

Discussion

44.	Write the name of monomers used for getting the following polymers : (i) Teflon (ii) Buna-N
Answer» Write the name of monomers used for getting the following polymers : (i) Teflon (ii) Buna-N

Discussion

45.	A metal forms two oxides, the higher oxide contains 80% metal, 0.72g of the lower oxide gave 0.8g of higher oxide on heating. Show that the data illustrates the law of multiple proportions?
Answer» A metal forms two oxides, the higher oxide contains 80% metal, 0.72g of the lower oxide gave 0.8g of higher oxide on heating. Show that the data illustrates the law of multiple proportions?

Discussion

46.	Which of the following halides has the least dipole moment?
Answer» Which of the following halides has the least dipole moment?

Discussion

47.	Cu+ is not known in aqueous solution. Give reason.
Answer» $C u^{+}$ is not known in aqueous solution. Give reason.

Discussion

48.	The minimum energy required by an electron to overcome the attractive forces of the nucleus is 0.4×10−19 J. What is the maximum kinetic energy of the ejected electron if the material is radiated with a light of wavelength 3313 nm?
Answer» The minimum energy required by an electron to overcome the attractive forces of the nucleus is $0.4 \times 10^{- 19} J$ . What is the maximum kinetic energy of the ejected electron if the material is radiated with a light of wavelength $3313 nm$ ?

Discussion

49.	Q4*) A compound?is formed by two elements M&N the element N forms CCP and atoms of M occupy 1/3rd of tetrahedral voids what is the formula of the compound
Answer» Q4*) A compound?is formed by two elements M&N the element N forms CCP and atoms of M occupy 1/3rd of tetrahedral voids what is the formula of the compound

Discussion

50.	A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of element X (as cations) occupy all the octahedral voids the formula for the compound is:
Answer» A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of element X (as cations) occupy all the octahedral voids the formula for the compound is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The equivalent mass of dichromate in acid medium is (Cr = 52 u):

For a monoatomic gas kinetic energy = E. The relation with R.M.S velocity is

The molar heat capacity of water at constant pressure P is 75JK−1 mol−1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is:

Why do some elements like carbon have different oxidation states in different elements whereas some elements like oxygen have a fixed oxidation number?

The electronic configuration of four elements L, P, Q and R are given in brackets (1s2,2s22p4);Q(1s2,2s22p6,3s23p5),p(1s2,2s22p6,3s1);R(1s22s62p6,3s2). The formulae of ionic compounds that can be formed between these elements are

Why does the molecularity of reactions usually range between 0 and 4 ?

Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.5 g per mL and the mass percent of nitric acid in it being 69%.

What are the molecules which concentrate and accumulate on the surface called:

Rhizobium and Rhodospirillum

Major product for the above reaction is :

When K2Cr2O7 is heated with conc. H2SO4 in the presence of a soluble metal chloride, orange red vapours are produced. These are due to

For a monoatomic gas, if the specific heat for a process is C=5R2, then density v/s temperature graph for the process will be:

A container contains 0.2 mol of CO2 and 0.1 mol H2 and establish following equilibrium. CO2(g)+H2(g)⇌CO(g)+H2O(g). At equlibrium H2O is found to be 25% by mol. The equilibrium constant Kp for the reaction is

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as :

Which of the following is true about the charge acquired by P-type semiconductors ? (a) Positive (b) Neutral (c) Negative (d) Depends on concentration of p impurity

List gases which are responsible for greenhouse effect.

Calculate the maximum work done (in cal) when pressure on 10 gram of hydrogen is reduced from 20 to 1 atm at a constant temperature of 273 K. the gas behave Ideally

Why does the reactivity of nitrogen differ from phosphorus?

Find the pH of a 0.002 N acetic acid solution if it is 2.5% ionised at a given dilution. (take log 3 = 0.5, log 5 = 0.7)

The spin angular momentum for the ′s′ electron in H−atom is:

The major products of the following reaction ZnS(s)+O2(g)heat−−−−→ Are

Calculate the total work done along the path 'ABCD' (as shown in figure) for a one mole of monoatomic gas.

Which of the following expressions for the percentage ionization of a monoacidic base (BOH) in an aqueous solution at appreciable concentration is not correct?

1.20 g sample of Na2CO3 and K2CO3 was dissolved in water to form 100 mL of a solution. 20 mL of this solution required 40 mL of 0.1 N HCl for complete neutralization. Calculate the weight of precipitate in the mixture if another 20 mL of this solution is treated with excess of BaCl2.

The major product for the given reaction is :

During an adiabatic process the pressure of the gas is found to be proportional to the cube of the absolute temperature. The ratio CPCV=γ for the gas is:

Which is the strongest conjugate base? The options are, (CH3)3CO , (CH3)2CHO , CH3CH2O, CH3O

Among [Ni(Co)4], [NiCl4]2−, [Co(NH3)4Cl2]Cl, Na2[CoF6]3+, Na2O2 and CsO2, the total number of paramagnetic compounds is

Explain thermal insulator

Is gallium solid or liquid

A compound MpXq has ccp arrangment of X.Its unit cell structure is shown.......Find emperical formula? (IIT-JEE 2012)

The sulphate of an element contains 42.2%of element . The equivalent weight of the element would be A)17. C)51 B)35. D)68

Which of the following hydrogen halides react(s) with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq)?

What is the volume of 6g of hydrogen at 1.5atm and 273∘C?

In the following reaction sequence, The major product B is:

The hybridization of central atom in dimer of BH3 and BeH2 is:

The formal charge on the phosphorous atom in PO3−4 ion is:

Why does the Rutherford model not explain absorption or emission spectrum??

Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. Question: In metal excess defect

Extrinsic semiconductor made from intrinsic semiconductor by -

The number of isoelectronic species among the following are: Ca2+, Ar, Cl−, K+, Kr, F−

Write the name of monomers used for getting the following polymers : (i) Teflon (ii) Buna-N

A metal forms two oxides, the higher oxide contains 80% metal, 0.72g of the lower oxide gave 0.8g of higher oxide on heating. Show that the data illustrates the law of multiple proportions?

Which of the following halides has the least dipole moment?

Cu+ is not known in aqueous solution. Give reason.

The minimum energy required by an electron to overcome the attractive forces of the nucleus is 0.4×10−19 J. What is the maximum kinetic energy of the ejected electron if the material is radiated with a light of wavelength 3313 nm?

Q4*) A compound?is formed by two elements M&amp;N the element N forms CCP and atoms of M occupy 1/3rd of tetrahedral voids what is the formula of the compound

A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of element X (as cations) occupy all the octahedral voids the formula for the compound is:

Q4*) A compound?is formed by two elements M&N the element N forms CCP and atoms of M occupy 1/3rd of tetrahedral voids what is the formula of the compound