46295 + Interview Questions in Chemistry Page 30 InterviewSolution

1451.	29. A carbon sample from the frame of a picture gives 7 counts of C-14 per minute per gram of carbon. If freshly cur wood gives 15.3 counts of C-14 per minute, calculate the age of the frame. (t1/2 of C-14=5570 years) 2. The binding energy per nucleon for C-12 is 7.68 MeV and that for C-13 is 7.4 MeV. calculate the energy required to remove a neutron from C -13
Answer» 29. A carbon sample from the frame of a picture gives 7 counts of C-14 per minute per gram of carbon. If freshly cur wood gives 15.3 counts of C-14 per minute, calculate the age of the frame. (t1/2 of C-14=5570 years) 2. The binding energy per nucleon for C-12 is 7.68 MeV and that for C-13 is 7.4 MeV. calculate the energy required to remove a neutron from C -13

Discussion

1452.	Phenol is heated with a solution of mixture of KBr and KBrO3. The major product obtained in the above reaction is:
Answer» Phenol is heated with a solution of mixture of KBr and KBrO₃. The major product obtained in the above reaction is:

Discussion

1453.	For the reaction: AB(g)⇌A(g)+B(g), AB is 25% dissociated at a total pressure of P. Then,
Answer» For the reaction: $A B (g) ⇌ A (g) + B (g)$ , $A B$ is $25 %$ dissociated at a total pressure of P. Then,

Discussion

1454.

List - I (Process) List - II (I) Reversible isothermal expansion of an ideal gas. (P) ΔSsys=0 (II) Reversible adiabatic compression of a real gas. (Q) ΔH=ΔU=ΔStotal=0 (III) Adiabatic free expansion (R) ΔStotal>0 (IV) Isothermal free expansion (S) q=0 (T) ΔSsurr=0 (U) ΔSsys>0 Which of the following options has the correct combination considering List - I and List - II.

Answer»

List - I (Process)	List - II
(I) Reversible isothermal expansion of an ideal gas.	(P) $Δ S_{s y s} = 0$
(II) Reversible adiabatic compression of a real gas.	(Q) $Δ H = Δ U = Δ S_{total} = 0$
(III) Adiabatic free expansion	(R) $Δ S_{total} > 0$
(IV) Isothermal free expansion	(S) $q = 0$
	(T) $Δ S_{surr} = 0$
	(U) $Δ S_{s y s} > 0$

Which of the following options has the correct combination considering List - I and List - II.

Discussion

1455.	R.H. Whittaker proposed:
Answer» R.H. Whittaker proposed:

Discussion

1456.	The Hybridisation of O atom in H2O is
Answer» The Hybridisation of O atom in $H_{2} O$ is

Discussion

1457.	2 g of steam at 100 ∘C is passed into 6 g of ice at 0 ∘C. If the latent heat of steam and ice are 540 cal/g and 80 cal/g respectively and specific heat capacity of water is 1 cal/g ∘C, then the final temperature of the mixture is
Answer» $2 g$ of steam at $100^{\circ} C$ is passed into $6 g$ of ice at $0^{\circ} C$ . If the latent heat of steam and ice are $540 cal/g$ and $80 cal/g$ respectively and specific heat capacity of water is $1 cal / g^{\circ} C$ , then the final temperature of the mixture is

Discussion

1458.	34. Q. 6 If a solution containing 68 g of AgNO3 is mixed with 11.7 g of NaCl , the maximum no. of moles of AgCl formed is
Answer» 34. Q. 6 If a solution containing 68 g of AgNO3 is mixed with 11.7 g of NaCl , the maximum no. of moles of AgCl formed is

Discussion

1459.	The major product U in the following reactions is
Answer» The major product U in the following reactions is

Discussion

1460.	Which of the following has the minimum ionic character?
Answer» Which of the following has the minimum ionic character?

Discussion

1461.	Number of orbitals in fourth energy level of an atom?
Answer» Number of orbitals in fourth energy level of an atom?

Discussion

1462.	19.Calculate heat of combustion of coal when 10 grams of coal on burning raises the temperatures of 2 litreif water from 20^° C to 55^° C
Answer» 19.Calculate heat of combustion of coal when 10 grams of coal on burning raises the temperatures of 2 litreif water from 20^° C to 55^° C

Discussion

1463.	The amount of residue obtained on heating 10g of CaCO3 and 10gNa2CO3 weighs
Answer» The amount of residue obtained on heating 10g of CaCO3 and 10gNa2CO3 weighs

Discussion

1464.	The electron energy in a hydrogen atom is given by E=(−21.7×10−12)n2 erg. Calculate the energy required to remove an electron completely from the n=2 orbit. What among the following is the longest wavelength (in cm) of light that can be used to cause this transmission:
Answer» The electron energy in a hydrogen atom is given by $E = \frac{(- 21.7 \times 10^{- 12})}{n_{2}} e r g$ . Calculate the energy required to remove an electron completely from the $n = 2$ orbit. What among the following is the longest wavelength (in $c m$ ) of light that can be used to cause this transmission:

Discussion

1465.	The vapour pressure of a solvent decreased by 10mm of hg when a non volatile solute was added to the solvent . The mole fraction of solute in solution is 0.2 what would be the mole fraction of solvent if decrease in vapour pressure 20mm of hg
Answer» The vapour pressure of a solvent decreased by 10mm of hg when a non volatile solute was added to the solvent . The mole fraction of solute in solution is 0.2 what would be the mole fraction of solvent if decrease in vapour pressure 20mm of hg

Discussion

1466.	The values of ′x′ in complexes Hx[Co(CO)4], [Fe(CO)x. (π−C5H5)]+ are respectively.
Answer» The values of $^{'} x^{'}$ in complexes $H_{x} [C o (C O)_{4}],$ $[F e (C O)_{x} . (π - C_{5} H_{5})]^{+}$ are respectively.

Discussion

1467.	16. In depression of freezing pt. & elevation in boiling pt., the value of their respective constants (i.e. molal freezing pt. depression constant & molal boiling pt. elevation constant) remains same for a very dilute solution at a particular temp. and pressure irrespective of the non-volatile solute we have taken or it changes?
Answer» 16. In depression of freezing pt. & elevation in boiling pt., the value of their respective constants (i.e. molal freezing pt. depression constant & molal boiling pt. elevation constant) remains same for a very dilute solution at a particular temp. and pressure irrespective of the non-volatile solute we have taken or it changes?

Discussion

1468.	Consider the following data: ΔfH0 (N2H4,l) = 50 kJ/mol ΔfH0 (NH3,g) = −46k J/mol B.E.(N−H) = 393 kJ/mol and B.E.(H−H) = 436 kJ/mol, also ΔvapH(N2H4,l) = 18 kJ/mol The N- N bond energy in N2H4 is
Answer» Consider the following data: $Δ f H^{0} (N_{2} H_{4}, l) = 50 k J / m o l$ $Δ f H^{0} (N H_{3}, g) = - 46 k J / m o l$ $B . E . (N - H) = 393 k J / m o l$ and $B . E . (H - H) = 436 k J / m o l$ , also $Δ_{v a p} H (N_{2} H_{4}, l) = 18 k J / m o l$ The N- N bond energy in $N_{2} H_{4}$ is

1468.

Consider the following data: ΔfH0 (N2H4,l) = 50 kJ/mol ΔfH0 (NH3,g) = −46k J/mol B.E.(N−H) = 393 kJ/mol and B.E.(H−H) = 436 kJ/mol, also ΔvapH(N2H4,l) = 18 kJ/mol The N- N bond energy in N2H4 is

Answer»

Consider the following data:

$Δ f H^{0} (N_{2} H_{4}, l) = 50 k J / m o l$

$Δ f H^{0} (N H_{3}, g) = - 46 k J / m o l$

$B . E . (N - H) = 393 k J / m o l$ and $B . E . (H - H) = 436 k J / m o l$ , also $Δ_{v a p} H (N_{2} H_{4}, l) = 18 k J / m o l$

The N- N bond energy in $N_{2} H_{4}$ is

Discussion

1469.	Oxidation state of Cr in K2Cr2O7 is
Answer» Oxidation state of $C r$ in $K_{2} C r_{2} O_{7}$ is

Discussion

1470.	39.If bond order shows the number of chemical bonds between two atoms then how bond order of NO is 2.5?
Answer» 39.If bond order shows the number of chemical bonds between two atoms then how bond order of NO is 2.5?

Discussion

1471.	how to determine n factor of reaction c5h12 +o2=co2+ h2
Answer» how to determine n factor of reaction c5h12 +o2=co2+ h2

Discussion

1472.	3.Which has efficient packing in H2O or H2O2 and also draw structure of H2O2 in hydrogen bonding
Answer» 3.Which has efficient packing in H2O or H2O2 and also draw structure of H2O2 in hydrogen bonding

Discussion

1473.	9. In the presence of Pt catalyst, hydrocarb- on (A) adds hydrogen gas to form n-hexane. When HBr is added to A only a single monobromo compound is formed, which is compound A?
Answer» 9. In the presence of Pt catalyst, hydrocarb- on (A) adds hydrogen gas to form n-hexane. When HBr is added to A only a single monobromo compound is formed, which is compound A?

Discussion

1474.	Which state of triply ionised Beryllium (Be+++) has the same or bital radius as that of the ground state of hydrogen?
Answer» Which state of triply ionised Beryllium $(B e^{+ + +})$ has the same or bital radius as that of the ground state of hydrogen?

Discussion

1475.	8 grams of a gas at stp occupies 5.6 lts the no of moles present in 64 grams of the gas
Answer» 8 grams of a gas at stp occupies 5.6 lts the no of moles present in 64 grams of the gas

Discussion

1476.	Which of the following method(s) is/are used for synthesis of alcohols?
Answer» Which of the following method(s) is/are used for synthesis of alcohols?

Discussion

1477.	Total number of chloro derivatives possible for ethane is
Answer» Total number of chloro derivatives possible for ethane is

Discussion

1478.	2 moles of monoatomic gas at temperature 27degree is mixed with 3 moles of diatomic gas at temperature 127 degree then temperature of mixture is approximately
Answer» 2 moles of monoatomic gas at temperature 27degree is mixed with 3 moles of diatomic gas at temperature 127 degree then temperature of mixture is approximately

Discussion

1479.	During roasting of zinc blende, it convert to..,..................
Answer» During roasting of zinc blende, it convert to..,..................

Discussion

1480.	In a Beryllium atom, if a0 be the radius of the first orbit, then the radius of the nth orbit will be,
Answer» In a Beryllium atom, if $a_{0}$ be the radius of the first orbit, then the radius of the $n^{th}$ orbit will be,

Discussion

1481.	(A)C7H14O3−−−−−−→Zn/AcOH(B)+(C)Compoun (A) exist in geometrical isomers and (B) gives Cannizaro reaction.(A) will be:
Answer» $(A) C_{7} H_{14} O_{3} - ----- \to Z n / A c O H (B) + (C)$ Compoun (A) exist in geometrical isomers and (B) gives Cannizaro reaction. (A) will be:

Discussion

1482.	20.Among venedium, chromium, mengenize,and Fe which will have the highest magnetic moment ? A) v B) cr C) Mn D) Fe
Answer» 20.Among venedium, chromium, mengenize,and Fe which will have the highest magnetic moment ? A) v B) cr C) Mn D) Fe

Discussion

1483.	5. A compound is soluble in conc. H_2SO_{4 }. It does not decolourise bromine in CCl_4 but is oxidised by chromic anhydride in aqueous sulphuric aid within two seconds, turning orange solution to blue green then opaque. The original solution contains(a) a secondary alcohol (b) an alkene(c) an ether(d)a primary alcohol
Answer» 5. A compound is soluble in conc. H_2SO_{4 }. It does not decolourise bromine in CCl_4 but is oxidised by chromic anhydride in aqueous sulphuric aid within two seconds, turning orange solution to blue green then opaque. The original solution contains(a) a secondary alcohol (b) an alkene(c) an ether(d)a primary alcohol

Discussion

1484.	When 100g of ethylene polymerises entirely to polyethene , the weight of polyethene formed as per the equation nCH2=CH2 gives (CH2 -CH2)n
Answer» When 100g of ethylene polymerises entirely to polyethene , the weight of polyethene formed as per the equation nCH2=CH2 gives (CH2 -CH2)n

Discussion

1485.	When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, ×10−5 moles of lead sulphate precipitate out. (Round off to the nearest integer).
Answer» When $35 m L$ of $0.15 M$ lead nitrate solution is mixed with $20 mL$ of $0.12 M$ chromic sulphate solution, $\times 10^{- 5}$ moles of lead sulphate precipitate out. (Round off to the nearest integer).

Discussion

1486.	The formula of di-chlorobis(urea) copper(II) is
Answer» The formula of di-chlorobis(urea) copper(II) is

Discussion

1487.	Theionization constant of dimethylamine is 5.4 × 10–4.Calculate its degree of ionization in its 0.02 M solution. Whatpercentage of dimethylamine is ionized if the solution is also 0.1 Min NaOH?
Answer» The ionization constant of dimethylamine is 5.4 × 10^–4. Calculate its degree of ionization in its 0.02 M solution. What percentage of dimethylamine is ionized if the solution is also 0.1 M in NaOH?

Discussion

1488.	How many unit cell are prsent in a cube shaped ideal crystal of Nacl of mass 1 gram
Answer» How many unit cell are prsent in a cube shaped ideal crystal of Nacl of mass 1 gram

Discussion

1489.	What is (X)?
Answer» What is (X)?

Discussion

1490.	Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?
Answer» Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?

Discussion

1491.	29. Two types of subshells are partially filled in- Cu,Cr,Fe or Zn. 2.
Answer» 29. Two types of subshells are partially filled in- Cu,Cr,Fe or Zn. 2.

Discussion

1492.	what will be the major dehydration product formed when 3,4 dimethyl pen†an ol is treated with concH2SO4
Answer» what will be the major dehydration product formed when 3,4 dimethyl pen†an ol is treated with concH2SO4

Discussion

1493.	what is rhe angular momentum of an electron in bohrs hydrogen atom whose energy is -0.54e
Answer» what is rhe angular momentum of an electron in bohrs hydrogen atom whose energy is -0.54e

Discussion

1494.	A metal has two stable oxidation states a and b. The metal is converted into its lower oxidation state (Ma+) by concentrated H2SO4 and further oxidised to its higher oxidation state (Mb+) by KMnO4. 0.4 moles of the metal liberated 8.96 litres (at STP) of H2 on reaction with H2SO4 to form Ma+ and further required 40 mL of 2 M KMnO4 in acidic medium to form Mb+. The value of (a+b) is
Answer» A metal has two stable oxidation states a and b. The metal is converted into its lower oxidation state $(M^{a +})$ by concentrated $H_{2} S O_{4}$ and further oxidised to its higher oxidation state $(M^{b +})$ by $K M n O_{4}$ . $0.4$ moles of the metal liberated $8.96$ litres (at STP) of $H_{2}$ on reaction with $H_{2} S O_{4}$ to form $M^{a +}$ and further required $40 m L$ of $2 M K M n O_{4}$ in acidic medium to form $M^{b +}$ . The value of (a+b) is

Discussion

1495.	(i) How much electricity in terms of Faraday required to produce. 20.0 g of Ca from molten CaCl2P (ii) How much electricity in terms of Faraday required to produce.
Answer» (i) How much electricity in terms of Faraday required to produce. 20.0 g of Ca from molten $C a C l_{2} P$ (ii) How much electricity in terms of Faraday required to produce.

1495.

(i) How much electricity in terms of Faraday required to produce. 20.0 g of Ca from molten CaCl2P (ii) How much electricity in terms of Faraday required to produce.

Answer»

(i) How much electricity in terms of Faraday required to produce.

20.0 g of Ca from molten $C a C l_{2} P$

(ii) How much electricity in terms of Faraday required to produce.

Discussion

1496.	The compound that does not have a π bond is:
Answer» The compound that does not have a $π$ bond is:

Discussion

1497.	IE1 and IE2 of Mg are 178 and 348 kcal respectively. The energy required (in kcal) for the following reaction is:Mg→Mg2++2e−(Where IE = ionization energy)
Answer» $I E_{1}$ and $I E_{2}$ of $M g$ are $178$ and $348 kcal$ respectively. The energy required (in kcal) for the following reaction is: $M g \to M g^{2 +} + 2 e^{-}$ (Where $I E$ = ionization energy)

Discussion

1498.	The number of electron present in 448ml of o2
Answer» The number of electron present in 448ml of o2

Discussion

1499.	Write the IUPAC name of:- Na_2\lbrack Cr(EDTA)\rbrack
Answer» Write the IUPAC name of:- Na_2\lbrack Cr(EDTA)\rbrack

Discussion

1500.	Silicon reacts with hot solution of NaOH forming
Answer» Silicon reacts with hot solution of NaOH forming

Discussion

Explore topic-wise InterviewSolutions in .

Phenol is heated with a solution of mixture of KBr and KBrO3. The major product obtained in the above reaction is:

For the reaction: AB(g)⇌A(g)+B(g), AB is 25% dissociated at a total pressure of P. Then,

R.H. Whittaker proposed:

The Hybridisation of O atom in H2O is

2 g of steam at 100 ∘C is passed into 6 g of ice at 0 ∘C. If the latent heat of steam and ice are 540 cal/g and 80 cal/g respectively and specific heat capacity of water is 1 cal/g ∘C, then the final temperature of the mixture is

34. Q. 6 If a solution containing 68 g of AgNO3 is mixed with 11.7 g of NaCl , the maximum no. of moles of AgCl formed is

The major product U in the following reactions is

Which of the following has the minimum ionic character?

Number of orbitals in fourth energy level of an atom?

19.Calculate heat of combustion of coal when 10 grams of coal on burning raises the temperatures of 2 litreif water from 20^° C to 55^° C

The amount of residue obtained on heating 10g of CaCO3 and 10gNa2CO3 weighs

The electron energy in a hydrogen atom is given by E=(−21.7×10−12)n2 erg. Calculate the energy required to remove an electron completely from the n=2 orbit. What among the following is the longest wavelength (in cm) of light that can be used to cause this transmission:

The vapour pressure of a solvent decreased by 10mm of hg when a non volatile solute was added to the solvent . The mole fraction of solute in solution is 0.2 what would be the mole fraction of solvent if decrease in vapour pressure 20mm of hg

The values of ′x′ in complexes Hx[Co(CO)4], [Fe(CO)x. (π−C5H5)]+ are respectively.

Consider the following data: ΔfH0 (N2H4,l) = 50 kJ/mol ΔfH0 (NH3,g) = −46k J/mol B.E.(N−H) = 393 kJ/mol and B.E.(H−H) = 436 kJ/mol, also ΔvapH(N2H4,l) = 18 kJ/mol The N- N bond energy in N2H4 is

Oxidation state of Cr in K2Cr2O7 is

39.If bond order shows the number of chemical bonds between two atoms then how bond order of NO is 2.5?

how to determine n factor of reaction c5h12 +o2=co2+ h2

3.Which has efficient packing in H2O or H2O2 and also draw structure of H2O2 in hydrogen bonding

9. In the presence of Pt catalyst, hydrocarb- on (A) adds hydrogen gas to form n-hexane. When HBr is added to A only a single monobromo compound is formed, which is compound A?

Which state of triply ionised Beryllium (Be+++) has the same or bital radius as that of the ground state of hydrogen?

8 grams of a gas at stp occupies 5.6 lts the no of moles present in 64 grams of the gas

Which of the following method(s) is/are used for synthesis of alcohols?

Total number of chloro derivatives possible for ethane is

2 moles of monoatomic gas at temperature 27degree is mixed with 3 moles of diatomic gas at temperature 127 degree then temperature of mixture is approximately

During roasting of zinc blende, it convert to..,..................

In a Beryllium atom, if a0 be the radius of the first orbit, then the radius of the nth orbit will be,

(A)C7H14O3−−−−−−→Zn/AcOH(B)+(C)Compoun (A) exist in geometrical isomers and (B) gives Cannizaro reaction.(A) will be:

20.Among venedium, chromium, mengenize,and Fe which will have the highest magnetic moment ? A) v B) cr C) Mn D) Fe

When 100g of ethylene polymerises entirely to polyethene , the weight of polyethene formed as per the equation nCH2=CH2 gives (CH2 -CH2)n

When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, ×10−5 moles of lead sulphate precipitate out. (Round off to the nearest integer).

The formula of di-chlorobis(urea) copper(II) is

Theionization constant of dimethylamine is 5.4 × 10–4.Calculate its degree of ionization in its 0.02 M solution. Whatpercentage of dimethylamine is ionized if the solution is also 0.1 Min NaOH?

How many unit cell are prsent in a cube shaped ideal crystal of Nacl of mass 1 gram

What is (X)?

Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?

29. Two types of subshells are partially filled in- Cu,Cr,Fe or Zn. 2.

what will be the major dehydration product formed when 3,4 dimethyl pen†an ol is treated with concH2SO4

what is rhe angular momentum of an electron in bohrs hydrogen atom whose energy is -0.54e

(i) How much electricity in terms of Faraday required to produce. 20.0 g of Ca from molten CaCl2P (ii) How much electricity in terms of Faraday required to produce.

The compound that does not have a π bond is:

IE1 and IE2 of Mg are 178 and 348 kcal respectively. The energy required (in kcal) for the following reaction is:Mg→Mg2++2e−(Where IE = ionization energy)

The number of electron present in 448ml of o2

Write the IUPAC name of:- Na_2\lbrack Cr(EDTA)\rbrack

Silicon reacts with hot solution of NaOH forming