46295 + Interview Questions in Chemistry Page 17 InterviewSolution

801.	14. The decomposition of phosphine on tungsten at law pressure is a first order rxn.it is because the 1)rate is proportional to surface coverage 2)rate is inversely proportional to surface coverage 3)rate is independent of surface coverage 4)rate of decomposition is very slow
Answer» 14. The decomposition of phosphine on tungsten at law pressure is a first order rxn.it is because the 1)rate is proportional to surface coverage 2)rate is inversely proportional to surface coverage 3)rate is independent of surface coverage 4)rate of decomposition is very slow

Discussion

802.	Which among the following is an anionic detergent?
Answer» Which among the following is an anionic detergent?

Discussion

803.	Two equal negative charges -q are fixed at point \lbrack0,a\rbrack and \lbrack0,-a\rbrack on Y-axis.A positive charge Q is released from rest at point \lbrack2a,0\rbrack on X-axis.The charge Q will a.execute SHM about origin b.move to origin and remained at rest c.move to infinity d.execute oscillatory motion but not SHM
Answer» Two equal negative charges -q are fixed at point \lbrack0,a\rbrack and \lbrack0,-a\rbrack on Y-axis.A positive charge Q is released from rest at point \lbrack2a,0\rbrack on X-axis.The charge Q will a.execute SHM about origin b.move to origin and remained at rest c.move to infinity d.execute oscillatory motion but not SHM

Discussion

804.	If time required when a current of 9.65 A is passed through 80 mL of 0.1 M NaCl solution in order to make its pH=12 is x sec and time required when a current of 965 A is passed through an aqueous solution of CuSO4 to produce 0.28 L of oxygen gas at STP is y sec. Then the value of xy would be
Answer» If time required when a current of $9.65 A$ is passed through $80 mL$ of $0.1 M NaCl$ solution in order to make its $p H = 12$ is $x sec$ and time required when a current of $965 A$ is passed through an aqueous solution of $C u S O_{4}$ to produce $0.28 L$ of oxygen gas at STP is $y sec$ . Then the value of $\frac{x}{y}$ would be

Discussion

805.	1 mole of Ba(OH)2 will exactly neutralize
Answer» 1 mole of $B a (O H)_{2}$ will exactly neutralize

Discussion

806.	23.Why the geometrical isomer8sm is not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion
Answer» 23.Why the geometrical isomer8sm is not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion

Discussion

807.	An α−particle and a proton are both moving with the same speed. They approach a gold foil. If the distance of the closest approach for proton is y, what will be its value for the α−particle?
Answer» An $α -$ particle and a proton are both moving with the same speed. They approach a gold foil. If the distance of the closest approach for proton is $y,$ what will be its value for the $α -$ particle?

Discussion

808.	Suppose the chemists had chosen 1020 as the number of particles in a mole. What would be the molar mass of oxygen gas?
Answer» Suppose the chemists had chosen $10^{20}$ as the number of particles in a mole. What would be the molar mass of oxygen gas?

Discussion

809.	In the given reaction, end product is:
Answer» In the given reaction, end product is:

Discussion

810.	A compound has an empirical formula C2H4O. An independent analysis gave a value of 66.08 for its vapour density. What is the correct molecular formula?[1 mark]
Answer» A compound has an empirical formula $C_{2} H_{4} O$ . An independent analysis gave a value of 66.08 for its vapour density. What is the correct molecular formula? [1 mark]

Discussion

811.	M.F. Hussain was working one of his masterpieces. His young son walks up to him and proudly explains, "Dad, did you know paint works on the basis of adsorption?"Hussain: "Oh, really? Can you tell me how?" What was his son's reply?
Answer» M.F. Hussain was working one of his masterpieces. His young son walks up to him and proudly explains, "Dad, did you know paint works on the basis of adsorption?" Hussain: "Oh, really? Can you tell me how?" What was his son's reply?

Discussion

812.	If Fresnel's biprism experiment is held in water instead of air, then what will be the effect on fringe width (a) Decreases (b) Increases (c) No effect (d) None of these.
Answer» If Fresnel's biprism experiment is held in water instead of air, then what will be the effect on fringe width (a) Decreases (b) Increases (c) No effect (d) None of these.

Discussion

813.	What will be the value of the equivalent weight of KBrO3 in the following ionic equation?2BrO−3+12H++10e−→Br2+6H2O(Given: The molecular weight of KBrO3 is M.)
Answer» What will be the value of the equivalent weight of $K B r O_{3}$ in the following ionic equation? $2 B r O_{3}^{-} + 12 H^{+} + 10 e^{-} \to B r_{2} + 6 H_{2} O$ (Given: The molecular weight of $K B r O_{3}$ is $M$ .)

Discussion

814.	Which of the following is valid at absolute zero?
Answer» Which of the following is valid at absolute zero?

Discussion

815.	100 ml of1 molar Naoh is mixed with 50 ml of 1N koh solution normality of the mixture is
Answer» 100 ml of1 molar Naoh is mixed with 50 ml of 1N koh solution normality of the mixture is

Discussion

816.	Which of the following has a conjugated system?
Answer» Which of the following has a conjugated system?

Discussion

817.	Given, C2H2(g)→C2H4(g):ΔH∘=−175 kJ mol−1ΔH∘f(C2H4,g)=50kJ mol−1;ΔH∘f(H2O,l)=−280 kJ mol−1;ΔH∘f(CO2g)=−390 kJ mol−1If ΔH∘ is enthalpy of combustion (in kJ mole−1 of C2H2(g), then calculate the value of ∣∣∣ΔH∘257∣∣∣
Answer» Given, $C_{2} H_{2} (g) \to C_{2} H_{4} (g) : Δ H^{\circ} = - 175 {kJ mol}^{- 1}$ $Δ H_{f (C_{2} H_{4}, g)}^{\circ} = 50 kJ mo l^{- 1}; Δ H_{f (H_{2} O, l)}^{\circ} = - 280 {kJ mol}^{- 1}; Δ H_{f (C O_{2} g)}^{\circ} = - 390 {kJ mol}^{- 1}$ If $Δ H^{\circ}$ is enthalpy of combustion (in ${kJ mole}^{- 1}$ of $C_{2} H_{2} (g)$ , then calculate the value of $∣ ∣ ∣ \frac{Δ H^{\circ}}{257} ∣ ∣ ∣$

Discussion

818.	If potential at the surface of earth is assigned zero value then find potential at the centre of the earth mass of earth M Radius of earth
Answer» If potential at the surface of earth is assigned zero value then find potential at the centre of the earth mass of earth M Radius of earth

Discussion

819.	Which one of the following has highest Ionic conductivity?
Answer» Which one of the following has highest Ionic conductivity?

Discussion

820.	All cubic fomula's
Answer» All cubic fomula's

Discussion

821.	The adjective, 'crystalline' when applied to solids, implies an ideal crystal in which the structural units, termed as unit cells, are repeated regularly and indefinitely in three demansions in space. The unit cell containing at least one molecule, has a definite orientation and shape defined by the translational vectors, a, b and c. The unit cell therefore has a definite volume, V that contains the atoms and molecules necessary for generating the crystal.Every crystal can be classified as a member of one of the seven possible crystal systems or crystal classes that are defined by relationships, a, b and c of the unit cell and between the individual angles. α,β and γ of the unit cell. The structure of the given crystal may be assigned to one of the 230 space groups. These uniquely define the possible ways of arranging atoms in a three-dimentional solid.Based on these observations, seven crystal systems were identified: tricilinic, monoclinic, trogonal or rhombohedral, tetragonal, hexagonal, rhombic or orthorhombic and cubic.In which of the following structure unit cell shows the triclinic strusture?
Answer» The adjective, 'crystalline' when applied to solids, implies an ideal crystal in which the structural units, termed as unit cells, are repeated regularly and indefinitely in three demansions in space. The unit cell containing at least one molecule, has a definite orientation and shape defined by the translational vectors, $a, b$ and $c$ . The unit cell therefore has a definite volume, $V$ that contains the atoms and molecules necessary for generating the crystal. Every crystal can be classified as a member of one of the seven possible crystal systems or crystal classes that are defined by relationships, $a, b$ and $c$ of the unit cell and between the individual angles. $α, β$ and $γ$ of the unit cell. The structure of the given crystal may be assigned to one of the $230$ space groups. These uniquely define the possible ways of arranging atoms in a three-dimentional solid. Based on these observations, seven crystal systems were identified: tricilinic, monoclinic, trogonal or rhombohedral, tetragonal, hexagonal, rhombic or orthorhombic and cubic. In which of the following structure unit cell shows the triclinic strusture?

Discussion

822.	consider the reaction KClO3+6FeSO4+3H2SO4\xrightarrow[{}]{}KCl+3Fe2(So4)3+3H2O if concentration of FeSO4 decreases from 0.9M to 0.3M in 10seconds , the rate of formation of KCl in the above reaction
Answer» consider the reaction KClO3+6FeSO4+3H2SO4\xrightarrow[{}]{}KCl+3Fe2(So4)3+3H2O if concentration of FeSO4 decreases from 0.9M to 0.3M in 10seconds , the rate of formation of KCl in the above reaction

Discussion

823.	Which of the following structure contain a hemiacetal group?
Answer» Which of the following structure contain a hemiacetal group?

Discussion

824.	Howwill you distinguish between the following pairs of terms:(i)Hexagonalclose-packing and cubic close-packing?(ii)Crystallattice and unit cell?(iii) Tetrahedral void and octahedral void?
Answer» How will you distinguish between the following pairs of terms: (i) Hexagonal close-packing and cubic close-packing? (ii) Crystal lattice and unit cell? (iii) Tetrahedral void and octahedral void?

824.

Howwill you distinguish between the following pairs of terms:(i)Hexagonalclose-packing and cubic close-packing?(ii)Crystallattice and unit cell?(iii) Tetrahedral void and octahedral void?

Answer»

How
will you distinguish between the following pairs of terms:

(i)
Hexagonal
close-packing and cubic close-packing?

(ii)
Crystal
lattice and unit cell?

(iii)
Tetrahedral void and octahedral void?

Discussion

825.	Specific heat of water is 4.2 J/kg K. If light of frequency 4×109 Hz is used to heat 100 gm of water from 20 ∘C to 100 ∘C. The no. of photons required will be,
Answer» Specific heat of water is $4.2 J/kg K$ . If light of frequency $4 \times 10^{9} Hz$ is used to heat $100 gm$ of water from $20^{\circ} C$ to $100^{\circ} C$ . The no. of photons required will be,

Discussion

826.	The pH of a solution that is 0.1M NaA and 0.1M HA (Ka=1×10−6) would be:
Answer» The $p H$ of a solution that is 0.1M NaA and 0.1M HA $(K a = 1 \times 10^{- 6})$ would be:

Discussion

827.	Find out the number of compound(s) having non zero Dipole moment.
Answer» Find out the number of compound(s) having non zero Dipole moment.

Discussion

828.	Calculate q for the isothermal reversible expansion of one mole of an ideal gas from an initial volume of 12 L to a final volume of 120 L at constant temperature of 273 K.
Answer» Calculate $q$ for the isothermal reversible expansion of one mole of an ideal gas from an initial volume of $12 L$ to a final volume of $120 L$ at constant temperature of $273 K$ .

Discussion

829.	Postulates of vbt &vsepr
Answer» Postulates of vbt &vsepr

Discussion

830.	52 What is the main product formed when CH3CH2CH(F)CH3 is treated with alcoholic KOH?
Answer» 52 What is the main product formed when CH3CH2CH(F)CH3 is treated with alcoholic KOH?

Discussion

831.	Among methanol and phenol which has stronger hydrogen bonding? And why as both have OH group?
Answer» Among methanol and phenol which has stronger hydrogen bonding? And why as both have OH group?

Discussion

832.	let the r.m.s velocity of nitrogen molecules at a temperature t^° C be v†extbullet.suppose all the molecules dissociate into atoms when temperature is raised to (2t+273)^° c,then the new most proba
Answer» let the r.m.s velocity of nitrogen molecules at a temperature t^° C be v†extbullet.suppose all the molecules dissociate into atoms when temperature is raised to (2t+273)^° c,then the new most proba

Discussion

833.	Is any difference between upper and lower part of glass
Answer» Is any difference between upper and lower part of glass

Discussion

834.	{ Initial pressule is }P ond volume is }V_0 for a }} monoatomic gas. If fixstly velume of gas is }{ Ted upto }2 vo by iso thermal process and then }}{ funthel volume is Ted to }16 Vo by adiatoric }} process then calculate final pressure?
Answer» { Initial pressule is }P ond volume is }V_0 for a }} monoatomic gas. If fixstly velume of gas is }{ Ted upto }2 vo by iso thermal process and then }}{ funthel volume is Ted to }16 Vo by adiatoric }} process then calculate final pressure?

Discussion

835.	If my weighing scale shows 60 reading.What is my mass and weight,?
Answer» If my weighing scale shows 60 reading.What is my mass and weight,?

Discussion

836.	0.5 molal aqueous solution of a weak acid HX is 20% ionized. If Kf for water is 1.86 Kkgmol−1, the lowering in freezing point of the solution is
Answer» 0.5 molal aqueous solution of a weak acid $H X$ is 20% ionized. If $K_{f}$ for water is 1.86 $K k g m o l^{- 1}$ , the lowering in freezing point of the solution is

Discussion

837.	Chlorination of Benzene is:
Answer» Chlorination of Benzene is:

Discussion

838.	If the radius of first Borh orbit is r then the radius of second orbit will be
Answer» If the radius of first Borh orbit is $r$ then the radius of second orbit will be

Discussion

839.	The number of iodine atoms present in 50ml of a 0.1M KI solution is?
Answer» The number of iodine atoms present in 50ml of a 0.1M KI solution is?

Discussion

840.	Give reasons for the following observations : (i) Physisorption decreases with increase in temperature. (ii) Addition of alum purifies the water. (iii) Brownian movement provides stability to the colloidal solution.
Answer» Give reasons for the following observations : (i) Physisorption decreases with increase in temperature. (ii) Addition of alum purifies the water. (iii) Brownian movement provides stability to the colloidal solution.

Discussion

841.	What is halogen??
Answer» What is halogen??

Discussion

842.	76 Why Ni have lower 1st ionisation enthalpy than cu
Answer» 76 Why Ni have lower 1st ionisation enthalpy than cu

Discussion

843.	As the temperature is raised from 20∘C to 40∘C. The average kinetic energy of neon atoms changes by a factor of which of the following:
Answer» As the temperature is raised from $20^{\circ} C$ to $40^{\circ} C$ . The average kinetic energy of neon atoms changes by a factor of which of the following:

Discussion

844.	18. Why does solubility of sulphate decreases down the group for group 2 elements ?
Answer» 18. Why does solubility of sulphate decreases down the group for group 2 elements ?

Discussion

845.	Purest form of hydrogen peroxide exist in which state - solid, liquid, gas or semisolid. Explain
Answer» Purest form of hydrogen peroxide exist in which state - solid, liquid, gas or semisolid. Explain

Discussion

846.	What is the significance of superposition principal in electric field??
Answer» What is the significance of superposition principal in electric field??

Discussion

847.	18. In a mixture of NaHcO3 and Na2CO3 volume of HCl required is x ml with phenolphthalein and y ml with methyl orange in same titration . Hence, volume of HCl for for complete reaction of Na2CO3 is ??
Answer» 18. In a mixture of NaHcO3 and Na2CO3 volume of HCl required is x ml with phenolphthalein and y ml with methyl orange in same titration . Hence, volume of HCl for for complete reaction of Na2CO3 is ??

Discussion

848.	The ΔfHo for the CO2(g), CO(g) and H2O(l) are −393.5, −110.5 and −241.8 kJ mol−1 respectively. The standard internal energy change (in kJ mol−1) for the given reaction at 298 K is:CO2(g)+H2(g)→CO(g)+H2O(l) (Given R=8.3 J/K/mol)
Answer» The $Δ_{f} H^{o}$ for the $C O_{2} (g), C O (g)$ and $H_{2} O (l)$ are $- 393.5, - 110.5$ and $- 241.8 {kJ mol}^{- 1}$ respectively. The standard internal energy change (in ${kJ mol}^{- 1}$ ) for the given reaction at $298 K$ is: $C O_{2} (g) + H_{2} (g) \to C O (g) + H_{2} O (l)$ (Given $R = 8.3 J/K/mol$ )

Discussion

849.	At a pressure of 760 torr and temperature of 273 K, the indicated volume of which system is not consistent with the observation
Answer» At a pressure of 760 torr and temperature of $273 K$ , the indicated volume of which system is not consistent with the observation

Discussion

850.	The highest conductivity for molten salt & aqueous salt of IIA group cations are respectively
Answer» The highest conductivity for molten salt & aqueous salt of IIA group cations are respectively

Discussion

Explore topic-wise InterviewSolutions in .

14. The decomposition of phosphine on tungsten at law pressure is a first order rxn.it is because the 1)rate is proportional to surface coverage 2)rate is inversely proportional to surface coverage 3)rate is independent of surface coverage 4)rate of decomposition is very slow

Which among the following is an anionic detergent?

If time required when a current of 9.65 A is passed through 80 mL of 0.1 M NaCl solution in order to make its pH=12 is x sec and time required when a current of 965 A is passed through an aqueous solution of CuSO4 to produce 0.28 L of oxygen gas at STP is y sec. Then the value of xy would be

1 mole of Ba(OH)2 will exactly neutralize

23.Why the geometrical isomer8sm is not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion

An α−particle and a proton are both moving with the same speed. They approach a gold foil. If the distance of the closest approach for proton is y, what will be its value for the α−particle?

Suppose the chemists had chosen 1020 as the number of particles in a mole. What would be the molar mass of oxygen gas?

In the given reaction, end product is:

A compound has an empirical formula C2H4O. An independent analysis gave a value of 66.08 for its vapour density. What is the correct molecular formula?[1 mark]

M.F. Hussain was working one of his masterpieces. His young son walks up to him and proudly explains, "Dad, did you know paint works on the basis of adsorption?"Hussain: "Oh, really? Can you tell me how?" What was his son's reply?

If Fresnel's biprism experiment is held in water instead of air, then what will be the effect on fringe width (a) Decreases (b) Increases (c) No effect (d) None of these.

What will be the value of the equivalent weight of KBrO3 in the following ionic equation?2BrO−3+12H++10e−→Br2+6H2O(Given: The molecular weight of KBrO3 is M.)

Which of the following is valid at absolute zero?

100 ml of1 molar Naoh is mixed with 50 ml of 1N koh solution normality of the mixture is

Which of the following has a conjugated system?

Given, C2H2(g)→C2H4(g):ΔH∘=−175 kJ mol−1ΔH∘f(C2H4,g)=50kJ mol−1;ΔH∘f(H2O,l)=−280 kJ mol−1;ΔH∘f(CO2g)=−390 kJ mol−1If ΔH∘ is enthalpy of combustion (in kJ mole−1 of C2H2(g), then calculate the value of ∣∣∣ΔH∘257∣∣∣

If potential at the surface of earth is assigned zero value then find potential at the centre of the earth mass of earth M Radius of earth

Which one of the following has highest Ionic conductivity?

All cubic fomula's

consider the reaction KClO3+6FeSO4+3H2SO4\xrightarrow[{}]{}KCl+3Fe2(So4)3+3H2O if concentration of FeSO4 decreases from 0.9M to 0.3M in 10seconds , the rate of formation of KCl in the above reaction

Which of the following structure contain a hemiacetal group?

Howwill you distinguish between the following pairs of terms:(i)Hexagonalclose-packing and cubic close-packing?(ii)Crystallattice and unit cell?(iii) Tetrahedral void and octahedral void?

Specific heat of water is 4.2 J/kg K. If light of frequency 4×109 Hz is used to heat 100 gm of water from 20 ∘C to 100 ∘C. The no. of photons required will be,

The pH of a solution that is 0.1M NaA and 0.1M HA (Ka=1×10−6) would be:

Find out the number of compound(s) having non zero Dipole moment.

Calculate q for the isothermal reversible expansion of one mole of an ideal gas from an initial volume of 12 L to a final volume of 120 L at constant temperature of 273 K.

Postulates of vbt &vsepr

52 What is the main product formed when CH3CH2CH(F)CH3 is treated with alcoholic KOH?

Among methanol and phenol which has stronger hydrogen bonding? And why as both have OH group?

let the r.m.s velocity of nitrogen molecules at a temperature t^° C be v†extbullet.suppose all the molecules dissociate into atoms when temperature is raised to (2t+273)^° c,then the new most proba

Is any difference between upper and lower part of glass

{ Initial pressule is }P ond volume is }V_0 for a }} monoatomic gas. If fixstly velume of gas is }{ Ted upto }2 vo by iso thermal process and then }}{ funthel volume is Ted to }16 Vo by adiatoric }} process then calculate final pressure?

If my weighing scale shows 60 reading.What is my mass and weight,?

0.5 molal aqueous solution of a weak acid HX is 20% ionized. If Kf for water is 1.86 Kkgmol−1, the lowering in freezing point of the solution is

Chlorination of Benzene is:

If the radius of first Borh orbit is r then the radius of second orbit will be

The number of iodine atoms present in 50ml of a 0.1M KI solution is?

Give reasons for the following observations : (i) Physisorption decreases with increase in temperature. (ii) Addition of alum purifies the water. (iii) Brownian movement provides stability to the colloidal solution.

What is halogen??

76 Why Ni have lower 1st ionisation enthalpy than cu

As the temperature is raised from 20∘C to 40∘C. The average kinetic energy of neon atoms changes by a factor of which of the following:

18. Why does solubility of sulphate decreases down the group for group 2 elements ?

Purest form of hydrogen peroxide exist in which state - solid, liquid, gas or semisolid. Explain

What is the significance of superposition principal in electric field??

18. In a mixture of NaHcO3 and Na2CO3 volume of HCl required is x ml with phenolphthalein and y ml with methyl orange in same titration . Hence, volume of HCl for for complete reaction of Na2CO3 is ??

The ΔfHo for the CO2(g), CO(g) and H2O(l) are −393.5, −110.5 and −241.8 kJ mol−1 respectively. The standard internal energy change (in kJ mol−1) for the given reaction at 298 K is:CO2(g)+H2(g)→CO(g)+H2O(l) (Given R=8.3 J/K/mol)

At a pressure of 760 torr and temperature of 273 K, the indicated volume of which system is not consistent with the observation

The highest conductivity for molten salt &amp; aqueous salt of IIA group cations are respectively

The highest conductivity for molten salt & aqueous salt of IIA group cations are respectively