46295 + Interview Questions in Chemistry Page 11 InterviewSolution

501.	An organic compound undergoes decomposition via first order kinetics. The time taken for its decomposition to 18th and 110th of its initial concentration are t18 and t110 respectively. What is the value of [t18][t110]×10?(log102=0.3)
Answer» An organic compound undergoes decomposition via first order kinetics. The time taken for its decomposition to $\frac{1}{8}$ th and $\frac{1}{10}$ th of its initial concentration are $\frac{t_{1}}{8}$ and $\frac{t_{1}}{10}$ respectively. What is the value of $\frac{[\frac{t_{1}}{8}]}{[\frac{t_{1}}{10}]} \times 10 ? ({log}_{10} 2 = 0.3)$

Discussion

502.	At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO2 in equilibrium with solid carbon has 90.55% CO by massC(s)+CO2(g)⇌2CO(g)Calculate Kc for this reaction at the above temperature.
Answer» At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO₂in equilibrium with solid carbon has 90.55% CO by mass $C (s) + C O_{2} (g) ⇌ 2 C O (g)$ Calculate K_cfor this reaction at the above temperature.

502.

At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO2 in equilibrium with solid carbon has 90.55% CO by massC(s)+CO2(g)⇌2CO(g)Calculate Kc for this reaction at the above temperature.

Answer»

At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO₂in equilibrium with solid carbon has 90.55% CO by mass
$C (s) + C O_{2} (g) ⇌ 2 C O (g)$

Calculate K_cfor this reaction at the above temperature.

Discussion

503.	Find the compound 'B'.
Answer» Find the compound 'B'.

Discussion

504.	The wavelength of Hα line of the Balmer series is 6500 oA. The wavelength of the Hβ line of Balmer series is:
Answer» The wavelength of $H_{α}$ line of the Balmer series is $6500 o A$ . The wavelength of the $H_{β}$ line of Balmer series is:

Discussion

505.	Compound A formed during the course of above reaction is:
Answer» Compound A formed during the course of above reaction is:

Discussion

506.	The minimum mass of mixture of A2 and B4 required to produce at least 1 kg of each product is :(Given Atomic mass of 'A' = 10; At mass of 'B' = 120)5A2+2B4→2AB2+4A2B
Answer» The minimum mass of mixture of $A_{2}$ and $B_{4}$ required to produce at least $1 k g$ of each product is : (Given Atomic mass of 'A' = 10; At mass of 'B' = 120) $5 A_{2} + 2 B_{4} \to 2 A B_{2} + 4 A_{2} B$

Discussion

507.	7 Phenols can be distinguished from ethyl alcohol by all reagents except (1) NaOH (2) FeCl3 (3) Br2/H2O (4) Na
Answer» 7 Phenols can be distinguished from ethyl alcohol by all reagents except (1) NaOH (2) FeCl3 (3) Br2/H2O (4) Na

Discussion

508.	3.7g of oxide of a metal was heated with charcoal. The liberated carbon dioxide was absorbed in NaOH solution and weighed 1.0g. If the specific gravity of the metal is 0.095cal/g the exact atomic mass of the metal is
Answer» 3.7g of oxide of a metal was heated with charcoal. The liberated carbon dioxide was absorbed in NaOH solution and weighed 1.0g. If the specific gravity of the metal is 0.095cal/g the exact atomic mass of the metal is

Discussion

509.	The number of moles of H_2O_2 required to completely react with 400 ml of 0.5 N KMnO_{4_{}}in acidic medium are?
Answer» The number of moles of H_2O_2 required to completely react with 400 ml of 0.5 N KMnO_{4_{}}in acidic medium are?

Discussion

510.	An exampleof autocatalytic reaction is [NCERT 1983]
Answer» An example of autocatalytic reaction is [NCERT 1983]

Discussion

511.	8. Main product formed when 1mole of CH3MgI reacts with 1mole of CH3COCH2CH2OH
Answer» 8. Main product formed when 1mole of CH3MgI reacts with 1mole of CH3COCH2CH2OH

Discussion

512.	Which of the following compounds would liberate CO2 on heating?
Answer» Which of the following compounds would liberate $C O_{2}$ on heating?

Discussion

513.	Question 44 Explain why CO2−3 ion cannot be represented by a single Lewis structure. How can it be best represented?
Answer» Question 44 Explain why $C O_{3}^{2 -}$ ion cannot be represented by a single Lewis structure. How can it be best represented?

513.

Question 44 Explain why CO2−3 ion cannot be represented by a single Lewis structure. How can it be best represented?

Answer»

Question 44

Explain why $C O_{3}^{2 -}$ ion cannot be represented by a single Lewis structure. How can it be best represented?

Discussion

514.	42 Why diphenyl Ether does not react with hydrogen iodide?
Answer» 42 Why diphenyl Ether does not react with hydrogen iodide?

Discussion

515.	0.9 gram aluminium reacts with dil.HCl to give H2. The volume of H2 evolved at STP is
Answer» 0.9 gram aluminium reacts with dil.HCl to give H2. The volume of H2 evolved at STP is

Discussion

516.	Why is i =2 for NaCl even when alpha( degree of dissociation) is 100%? Or i =3 for K2SO4 when alpha is 100% ?
Answer» Why is i =2 for NaCl even when alpha( degree of dissociation) is 100%? Or i =3 for K2SO4 when alpha is 100% ?

Discussion

517.	Which of the following is not an isoelectronic species?
Answer» Which of the following is not an isoelectronic species?

Discussion

518.	The geometry of H2S and its dipole moment are:
Answer» The geometry of H₂S and its dipole moment are:

Discussion

519.	The orbital having zero probability of finding electron on the surface of nucleus is and why 1. s 2. p_x 3. {d_{x^{2_{}}}}_{-y^2} 4. both 2 and 3
Answer» The orbital having zero probability of finding electron on the surface of nucleus is and why 1. s 2. p_x 3. {d_{x^{2_{}}}}_{-y^2} 4. both 2 and 3

Discussion

520.	What is molality of a 40% (w/w) H2O2 aqueous solution?
Answer» What is molality of a $40 % (w/w)$ $H_{2} O_{2}$ aqueous solution?

Discussion

521.	When an ideal gas (γ=53) is heated under constant pressure, what percentage of given heat energy will be utilized in doing external work?
Answer» When an ideal gas $(γ = \frac{5}{3})$ is heated under constant pressure, what percentage of given heat energy will be utilized in doing external work?

Discussion

522.	48 A crystal made up of A, B and C atoms, A occupy in all the tetrahedral voids and B occupied in octahedral void while C form fcc. The molecular formula of compound is
Answer» 48 A crystal made up of A, B and C atoms, A occupy in all the tetrahedral voids and B occupied in octahedral void while C form fcc. The molecular formula of compound is

Discussion

523.	Why is the work function of sodium less than that of copper?
Answer» Why is the work function of sodium less than that of copper?

Discussion

524.	what is difference between molar mass and molecular mass
Answer» what is difference between molar mass and molecular mass

Discussion

525.	In tetraamminecopper(2) complex what is the hybridisation and no. of unpaired electrons will be
Answer» In tetraamminecopper(2) complex what is the hybridisation and no. of unpaired electrons will be

Discussion

526.	How many protons,electrons and neutrons are presents in 2.4g of {}_{16}^{32}S ?
Answer» How many protons,electrons and neutrons are presents in 2.4g of {}_{16}^{32}S ?

Discussion

527.	i cap cross icap is equal to
Answer» i cap cross icap is equal to

Discussion

528.	How many H\ast ions are present in 1 ml of a solution whose pH is 13?(1) 10-16(2) 6.022 x 1013(4) 6.022 x 1023(3) 6.022 x 107
Answer» How many H\ast ions are present in 1 ml of a solution whose pH is 13?(1) 10-16(2) 6.022 x 1013(4) 6.022 x 1023(3) 6.022 x 107

Discussion

529.	When a graph is plotted between logxm and logp, it is a straight line with an angle 45∘ and intercept 0.3010 on y−axis. If initial pressure is 0.3 atm. what will be the amount of gas adsorbed per g of adsorbent:-
Answer» When a graph is plotted between $log \frac{x}{m}$ and $log p$ , it is a straight line with an angle $45^{\circ}$ and intercept $0.3010$ on $y -$ axis. If initial pressure is $0.3 atm$ . what will be the amount of gas adsorbed per $g$ of adsorbent:-

Discussion

530.	100 mL of Oxygen gas diffuses in 10 seconds. Hundred ml of gas X diffuses in t seconds. Gas X and time t can be
Answer» 100 mL of Oxygen gas diffuses in 10 seconds. Hundred ml of gas X diffuses in t seconds. Gas X and time t can be

Discussion

531.	34. Fund the no of position isomerism in tri substituted benzene if all substituent are different.
Answer» 34. Fund the no of position isomerism in tri substituted benzene if all substituent are different.

Discussion

532.	Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented.Under what conditions do these grapes ferment? Is it a chemical or a physical change?
Answer» Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?

Discussion

533.	Going from K shell to N shell, how can KE decrease as on going farther away from the nucleus the electron rotates faster due to lesser hold of the nucleus?
Answer» Going from K shell to N shell, how can KE decrease as on going farther away from the nucleus the electron rotates faster due to lesser hold of the nucleus?

Discussion

534.	if total energy of 2nd orbit of He+ ion is zero find potential enrgy 1st orbit of H ato
Answer» if total energy of 2nd orbit of He+ ion is zero find potential enrgy 1st orbit of H ato

Discussion

535.	Which group is meta directing group ?
Answer» Which group is meta directing group ?

Discussion

536.	Which of the following reactions will have a negative value of △S?
Answer» Which of the following reactions will have a negative value of $△ S$ ?

Discussion

537.	The correct order of the basic strength of methyl substituted amines in aqueous solution is :
Answer» The correct order of the basic strength of methyl substituted amines in aqueous solution is :

Discussion

538.	69.Why in formula of shm have two phases??
Answer» 69.Why in formula of shm have two phases??

Discussion

539.	Calculate the vapour pressure of water at 127∘C, when the aqueous tension at 27∘C is nearly 25 torr. (Given: Heat of vapourisation of water is approximately 40 kJ/mol) [e4=54.6]
Answer» Calculate the vapour pressure of water at $127^{\circ} C$ , when the aqueous tension at $27^{\circ} C$ is nearly $25 t o r r$ . (Given: Heat of vapourisation of water is approximately $40 k J / m o l$ ) [ $e^{4} = 54.6$ ]

Discussion

540.	For 2s orbital the nodal surface is at a distance of?
Answer» For 2s orbital the nodal surface is at a distance of?

Discussion

541.	The rate constant of a reaction increases by five times on increase in temperature from 27oC to 52oC. The value of activation energy in kJ mol−1 is: (Rounded off to the nearest integer) [R=8.314JK−1mol−1]
Answer» The rate constant of a reaction increases by five times on increase in temperature from $27^{o} C$ to $52^{o} C$ . The value of activation energy in ${kJ mol}^{- 1}$ is: (Rounded off to the nearest integer) $[R = 8.314 J K^{- 1} m o l^{- 1}]$

Discussion

542.	The number of stereoisomers possible for a compound of the molecular fomula:
Answer» The number of stereoisomers possible for a compound of the molecular fomula:

Discussion

543.	For the combustion of 1 mole of a liquid benzene at 25oC, the enthalpy is given by: C6H6(l)+152O2(g)→6CO2(g)+3H2O(l) ΔH=−780980 cal What would be the internal energy of the reaction?
Answer» For the combustion of 1 mole of a liquid benzene at $25^{o} C$ , the enthalpy is given by: $C_{6} H_{6} (l) + \frac{15}{2} O_{2} (g) \to 6 C O_{2} (g) + 3 H_{2} O (l)$ $Δ H = - 780980$ cal What would be the internal energy of the reaction?

Discussion

544.	Decomposition of H2O2 can be retarded by the addition of
Answer» Decomposition of $H_{2}$ $O_{2}$ can be retarded by the addition of

Discussion

545.	28. Vant hoff factor for acetic acid in aq.medium at infinte diltuion is ?
Answer» 28. Vant hoff factor for acetic acid in aq.medium at infinte diltuion is ?

Discussion

546.	What were the limitations of Dobereiner’s classification ?
Answer» What were the limitations of Dobereiner’s classification ?

Discussion

547.	Light of wavelength 625 nm illuminates two slits. The minimum path difference (in nm) between waves from slit so that resultant intensity is half of maximum is (Write upto two digits after the decimal point)
Answer» Light of wavelength 625 nm illuminates two slits. The minimum path difference (in nm) between waves from slit so that resultant intensity is half of maximum is (Write upto two digits after the decimal point)

Discussion

548.	What is Gibbs energy?
Answer» What is Gibbs energy?

Discussion

549.	PhCH2CH3NBS−−−→hνXalc. KOH−−−−−−→YYi. Hg(OAC)2, PhCH2OH−−−−−−−−−−−−−−−→ii. NaBH4, OH−ZMajor product Z would be:
Answer» $P h C H_{2} C H_{3} N B S - -- \to h ν X a l c . K O H - ----- \to Y$ $Y i . H g (O A C)_{2}, P h C H_{2} O H - -------------- \to i i . N a B H_{4}, O H^{-} Z$ Major product $Z$ would be:

Discussion

550.	What is the difference between Henry's law and Raoult's law?
Answer» What is the difference between Henry's law and Raoult's law?

Discussion

Explore topic-wise InterviewSolutions in .

An organic compound undergoes decomposition via first order kinetics. The time taken for its decomposition to 18th and 110th of its initial concentration are t18 and t110 respectively. What is the value of [t18][t110]×10?(log102=0.3)

At 1127 K and 1 atm pressure, a gaseous mixture of CO and CO2 in equilibrium with solid carbon has 90.55% CO by massC(s)+CO2(g)⇌2CO(g)Calculate Kc for this reaction at the above temperature.

Find the compound 'B'.

The wavelength of Hα line of the Balmer series is 6500 oA. The wavelength of the Hβ line of Balmer series is:

Compound A formed during the course of above reaction is:

The minimum mass of mixture of A2 and B4 required to produce at least 1 kg of each product is :(Given Atomic mass of 'A' = 10; At mass of 'B' = 120)5A2+2B4→2AB2+4A2B

7 Phenols can be distinguished from ethyl alcohol by all reagents except (1) NaOH (2) FeCl3 (3) Br2/H2O (4) Na

3.7g of oxide of a metal was heated with charcoal. The liberated carbon dioxide was absorbed in NaOH solution and weighed 1.0g. If the specific gravity of the metal is 0.095cal/g the exact atomic mass of the metal is

The number of moles of H_2O_2 required to completely react with 400 ml of 0.5 N KMnO_{4_{}}in acidic medium are?

An exampleof autocatalytic reaction is [NCERT 1983]

8. Main product formed when 1mole of CH3MgI reacts with 1mole of CH3COCH2CH2OH

Which of the following compounds would liberate CO2 on heating?

Question 44 Explain why CO2−3 ion cannot be represented by a single Lewis structure. How can it be best represented?

42 Why diphenyl Ether does not react with hydrogen iodide?

0.9 gram aluminium reacts with dil.HCl to give H2. The volume of H2 evolved at STP is

Why is i =2 for NaCl even when alpha( degree of dissociation) is 100%? Or i =3 for K2SO4 when alpha is 100% ?

Which of the following is not an isoelectronic species?

The geometry of H2S and its dipole moment are:

The orbital having zero probability of finding electron on the surface of nucleus is and why 1. s 2. p_x 3. {d_{x^{2_{}}}}_{-y^2} 4. both 2 and 3

What is molality of a 40% (w/w) H2O2 aqueous solution?

When an ideal gas (γ=53) is heated under constant pressure, what percentage of given heat energy will be utilized in doing external work?

48 A crystal made up of A, B and C atoms, A occupy in all the tetrahedral voids and B occupied in octahedral void while C form fcc. The molecular formula of compound is

Why is the work function of sodium less than that of copper?

what is difference between molar mass and molecular mass

In tetraamminecopper(2) complex what is the hybridisation and no. of unpaired electrons will be

How many protons,electrons and neutrons are presents in 2.4g of {}_{16}^{32}S ?

i cap cross icap is equal to

How many H\ast ions are present in 1 ml of a solution whose pH is 13?(1) 10-16(2) 6.022 x 1013(4) 6.022 x 1023(3) 6.022 x 107

When a graph is plotted between logxm and logp, it is a straight line with an angle 45∘ and intercept 0.3010 on y−axis. If initial pressure is 0.3 atm. what will be the amount of gas adsorbed per g of adsorbent:-

100 mL of Oxygen gas diffuses in 10 seconds. Hundred ml of gas X diffuses in t seconds. Gas X and time t can be

34. Fund the no of position isomerism in tri substituted benzene if all substituent are different.

Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented.Under what conditions do these grapes ferment? Is it a chemical or a physical change?

Going from K shell to N shell, how can KE decrease as on going farther away from the nucleus the electron rotates faster due to lesser hold of the nucleus?

if total energy of 2nd orbit of He+ ion is zero find potential enrgy 1st orbit of H ato

Which group is meta directing group ?

Which of the following reactions will have a negative value of △S?

The correct order of the basic strength of methyl substituted amines in aqueous solution is :

69.Why in formula of shm have two phases??

Calculate the vapour pressure of water at 127∘C, when the aqueous tension at 27∘C is nearly 25 torr. (Given: Heat of vapourisation of water is approximately 40 kJ/mol) [e4=54.6]

For 2s orbital the nodal surface is at a distance of?

The rate constant of a reaction increases by five times on increase in temperature from 27oC to 52oC. The value of activation energy in kJ mol−1 is: (Rounded off to the nearest integer) [R=8.314JK−1mol−1]

The number of stereoisomers possible for a compound of the molecular fomula:

For the combustion of 1 mole of a liquid benzene at 25oC, the enthalpy is given by: C6H6(l)+152O2(g)→6CO2(g)+3H2O(l) ΔH=−780980 cal What would be the internal energy of the reaction?

Decomposition of H2O2 can be retarded by the addition of

28. Vant hoff factor for acetic acid in aq.medium at infinte diltuion is ?

What were the limitations of Dobereiner’s classification ?

Light of wavelength 625 nm illuminates two slits. The minimum path difference (in nm) between waves from slit so that resultant intensity is half of maximum is (Write upto two digits after the decimal point)

What is Gibbs energy?

PhCH2CH3NBS−−−→hνXalc. KOH−−−−−−→YYi. Hg(OAC)2, PhCH2OH−−−−−−−−−−−−−−−→ii. NaBH4, OH−ZMajor product Z would be:

What is the difference between Henry's law and Raoult's law?