46295 + Interview Questions in Chemistry Page 38 InterviewSolution

1851.	Arrange F2, Cl2, Br2 and I2 in descending order of reactivity towards ethane
Answer» Arrange F2, Cl2, Br2 and I2 in descending order of reactivity towards ethane

Discussion

1852.	S=q/T , is formula of entropy for reversible process , then why we use it for irrversible process . what is the sign of dlt s [system] for a reaction of melting . it should be + ive right? because the solid absorb heat
Answer» S=q/T , is formula of entropy for reversible process , then why we use it for irrversible process . what is the sign of dlt s [system] for a reaction of melting . it should be + ive right? because the solid absorb heat

Discussion

1853.	How many among the following compound will give both the above result ?i. Cyclohexanone ii. Acetoneiii. Propionaldehyde iv. Acetophenonev. Acetaldehyde vi. Benzophenonevii. Benzaldehyde
Answer» How many among the following compound will give both the above result ? i. Cyclohexanone ii. Acetone iii. Propionaldehyde iv. Acetophenone v. Acetaldehyde vi. Benzophenone vii. Benzaldehyde

Discussion

1854.	The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water isa) 2.5 b)3 c)5 d)7.5
Answer» The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is a) 2.5 b)3 c)5 d)7.5

Discussion

1855.	The number of H-bond formed by water molecul
Answer» The number of H-bond formed by water molecul

Discussion

1856.	Explain why calamine solution is applied on the skin when an ant bites.
Answer» Explain why calamine solution is applied on the skin when an ant bites.

Discussion

1857.	Lactose molecule is made up of β-d (-) galactopyranose and β-d (+) gluco pyraonose. The number of - OH groups present in it are
Answer» Lactose molecule is made up of β-d (-) galactopyranose and β-d (+) gluco pyraonose. The number of - OH groups present in it are

Discussion

1858.	what is meant by a tengin in graphical representation
Answer» what is meant by a tengin in graphical representation

Discussion

1859.	Which of the following is true for Modern periodic table?
Answer» Which of the following is true for Modern periodic table?

Discussion

1860.	34. Are all the decomposition reactions endothermic and what are uses of decomposition reaction.
Answer» 34. Are all the decomposition reactions endothermic and what are uses of decomposition reaction.

Discussion

1861.	3. What will be the number of waves formed by a bohr electron in one complete revolution in its second Orbit? A. 3 B. 2 C. 1 D. 0
Answer» 3. What will be the number of waves formed by a bohr electron in one complete revolution in its second Orbit? A. 3 B. 2 C. 1 D. 0

Discussion

1862.	A flask contains CH4(g) and SO2(g) in equal weight ratio. The ratio of number of atoms of CH4 to that of SO2 in the flask is
Answer» A flask contains CH4(g) and SO2(g) in equal weight ratio. The ratio of number of atoms of CH4 to that of SO2 in the flask is

Discussion

1863.	Which of the following have both polar and non-polar bonds
Answer» Which of the following have both polar and non-polar bonds

Discussion

1864.	What happens when Grignard reagent reacts with Hgcl2?
Answer» What happens when Grignard reagent reacts with Hgcl2?

Discussion

1865.	The activation energy of a reaction at a given temperature is found to be 2.303 RT J/mol . The ratio of rate constant to the Arrhenius factor is
Answer» The activation energy of a reaction at a given temperature is found to be 2.303 RT J/mol . The ratio of rate constant to the Arrhenius factor is

Discussion

1866.	Select the one which has largest radius:Mg, Na, Na+, Mg+2, Al
Answer» Select the one which has largest radius:Mg, Na, Na+, Mg+2, Al

Discussion

1867.	The product (X) is:
Answer» The product (X) is:

Discussion

1868.	Which of the following graphs represents the highest activation energy for a forward reaction if the reaction is endothermic?
Answer» Which of the following graphs represents the highest activation energy for a forward reaction if the reaction is endothermic?

Discussion

1869.	A sample of radioactive material decays by two processes A and B with half life of 1/2 hr and 1/4 hr respectively. For the first half hour it decays with the process A, next one hour with the process B and for a further half hour simultaneously with both processes A and B. If originally there were No nuclei, find the number of remaining nuclei after 2 hr of these decays.
Answer» A sample of radioactive material decays by two processes $A$ and $B$ with half life of $1 / 2 hr$ and $1 / 4 hr$ respectively. For the first half hour it decays with the process $A$ , next one hour with the process $B$ and for a further half hour simultaneously with both processes $A$ and $B$ . If originally there were $N_{o}$ nuclei, find the number of remaining nuclei after $2 hr$ of these decays.

Discussion

1870.	For a fixed amount of given gas at temperature and pressure,
Answer» For a fixed amount of given gas at temperature and pressure,

Discussion

1871.	A drop of solution (volume = 0.050 mL) contains 6×10−7mol of H3O+ ions. If H3O+ions disappear at a constant rate of 6.0×105 mol L−1S−1, how long will take for the H3O+ ions in the drop to disappear ?
Answer» A drop of solution (volume = 0.050 mL) contains $6 \times 10^{- 7} m o l o f H_{3} O^{+}$ ions. If $H_{3} O^{+}$ ions disappear at a constant rate of $6.0 \times 10^{5}$ mol $L^{- 1} S^{- 1}$ , how long will take for the $H_{3} O^{+}$ ions in the drop to disappear ?

Discussion

1872.	Match the element with its associated functions/roles and choose thecorrect option among given below A. Boron i. splitting of H2O to liberate O2 duringphotosynthesis B. Manganese ii. needed for synthesis of auxins C. Molybdenum iii. component of nitrogenase D. Zinc iv. Pollen germination E. Iron v. component of ferredoxin
Answer» Match the element with its associated functions/roles and choose thecorrect option among given below A. Boron i. splitting of H2O to liberate O2 duringphotosynthesis B. Manganese ii. needed for synthesis of auxins C. Molybdenum iii. component of nitrogenase D. Zinc iv. Pollen germination E. Iron v. component of ferredoxin

1872.

Match the element with its associated functions/roles and choose thecorrect option among given below A. Boron i. splitting of H2O to liberate O2 duringphotosynthesis B. Manganese ii. needed for synthesis of auxins C. Molybdenum iii. component of nitrogenase D. Zinc iv. Pollen germination E. Iron v. component of ferredoxin

Answer»

Match the element with its associated functions/roles and choose thecorrect option among given below

A. Boron i. splitting of H2O to liberate O2 duringphotosynthesis

B. Manganese ii. needed for synthesis of auxins

C. Molybdenum iii. component of nitrogenase

D. Zinc iv. Pollen germination

E. Iron v. component of ferredoxin

Discussion

1873.	In which of the following alkyl halide is SN2 mechanism is favored the maximum
Answer» In which of the following alkyl halide is $S N_{2}$ mechanism is favored the maximum

Discussion

1874.	ntinbegining of reaction A is equlibrium withB+C ,2MMOLOF A taken,out of which 0.5 moleget disscoaited.what is amount of dissociation of A?n
Answer» ntinbegining of reaction A is equlibrium withB+C ,2MMOLOF A taken,out of which 0.5 moleget disscoaited.what is amount of dissociation of A?n

Discussion

1875.	24. Why tyndall effect is more effectively shown by lyophobic colloid?
Answer» 24. Why tyndall effect is more effectively shown by lyophobic colloid?

Discussion

1876.	What is \lbrack H+\rbrack in mol/L of a solution that is 0.20 M CH3COONa and 0.10 M in CH3COOH? (Ka for CH3COOH =1.8x10-5)
Answer» What is \lbrack H+\rbrack in mol/L of a solution that is 0.20 M CH3COONa and 0.10 M in CH3COOH? (Ka for CH3COOH =1.8x10-5)

Discussion

1877.	The fraction of total volume occupied by the atoms present in a simple cube is?
Answer» The fraction of total volume occupied by the atoms present in a simple cube is?

Discussion

1878.	The enthalpies of formation of Al2O3 and Cr2O3 are −1569 KJ and −1134 KJ respectively. ΔH for the reaction 2Al + Cr2O3 → 2Cr + Al2O3 is
Answer» The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction $2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$ is

1878.

The enthalpies of formation of Al2O3 and Cr2O3 are −1569 KJ and −1134 KJ respectively. ΔH for the reaction 2Al + Cr2O3 → 2Cr + Al2O3 is

Answer»

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

$2 A l + C r_{2} O_{3} \to 2 C r + A l_{2} O_{3}$ is

Discussion

1879.	Which of the following isomerism is shown by alkanes?
Answer» Which of the following isomerism is shown by alkanes?

Discussion

1880.

The results given in the below table were obtained during kinetic studies of the following reaction:A+2B→C+DExperiment Initial concentration [A]Initial concentration [B]Initial rate of formation of D10.10.16×10−320.30.27×10−230.30.42.8×10−140.40.12.4×10−2What will be correct rate law expression for the given reaction?

Answer»

The results given in the below table were obtained during kinetic studies of the following reaction:

$A + 2 B \to C + D$

Experiment	Initial concentration [A]	Initial concentration [B]	Initial rate of formation of D
1	0.1	0.1	$6 \times 10^{- 3}$
2	0.3	0.2	$7 \times 10^{- 2}$
3	0.3	0.4	$2.8 \times 10^{- 1}$
4	0.4	0.1	$2.4 \times 10^{- 2}$

What will be correct rate law expression for the given reaction?

Discussion

1881.	H2O2 is stored in:
Answer» $H_{2} O_{2}$ is stored in:

Discussion

1882.	Why there is two hydrogen bond in adenine and thymine but in guanine and cytosibe there is 3 Hydrogen bond
Answer» Why there is two hydrogen bond in adenine and thymine but in guanine and cytosibe there is 3 Hydrogen bond

Discussion

1883.	why are 2p electrons attracted more towarsds nucleus than 3s electrons if shielding effect takes plac
Answer» why are 2p electrons attracted more towarsds nucleus than 3s electrons if shielding effect takes plac

Discussion

1884.	if p^ka =4 then vant hoff factor for weak monobasic acid when c=0.01M
Answer» if p^ka =4 then vant hoff factor for weak monobasic acid when c=0.01M

Discussion

1885.	1)Calculate n -factor for Al2O3 for the following reaction. Al(excess) +O2 Al2O3 2)If x gram of Al2O3 is formed ,y gram of Al is consumed in the reaction .Find realtion between x and y.( Use concept of gram equivalent).
Answer» 1)Calculate n -factor for Al2O3 for the following reaction. Al(excess) +O2 Al2O3 2)If x gram of Al2O3 is formed ,y gram of Al is consumed in the reaction .Find realtion between x and y.( Use concept of gram equivalent).

Discussion

1886.	The central atom in _____ violates the octet rule. Given the atomic number of Se=34, As=33, B=5 and N=7.
Answer» The central atom in _____ violates the octet rule. Given the atomic number of $S e = 34$ , $A s = 33$ , $B = 5$ and $N = 7$ .

Discussion

1887.	Which will be the expected product when excess of reagents are used?
Answer» Which will be the expected product when excess of reagents are used?

Discussion

1888.	Assertion:- O3 is a good oxidising agent Reason:- O3 very rapidly gives dioxygen
Answer» Assertion:- O3 is a good oxidising agent Reason:- O3 very rapidly gives dioxygen

Discussion

1889.	Total number of steroisomers possible for 4-chloropent-2-ene is
Answer» Total number of steroisomers possible for 4-chloropent-2-ene is

Discussion

1890.	The quantum number that is no way related to other quantum number is
Answer» The quantum number that is no way related to other quantum number is

Discussion

1891.	100 mL of a buffer solution contains 0.1 M each of weak acid HA and salt NaA. How many grams of NaOH should be added to the buffer so that its pH becomes 6? (Ka of HA=10−5)
Answer» $100 mL$ of a buffer solution contains $0.1 M$ each of weak acid $H A$ and salt $N a A$ . How many grams of $N a O H$ should be added to the buffer so that its pH becomes 6? $(K_{a} of HA = 10^{- 5})$

Discussion

1892.	71. .(CH3)₂C˙ CH₂CH₃ and (CH₃)₃C˙ among these two free radical which is more stable and why ?
Answer» 71. .(CH3)₂C˙ CH₂CH₃ and (CH₃)₃C˙ among these two free radical which is more stable and why ?

Discussion

1893.	Six moles of an ideal gas performs a cycle as shown in figure. If the temperatures are TA=600 K, TB=800 K, TC=2200 K and TD=1200 K , then the work done for complete cycle is (in kJ)
Answer» Six moles of an ideal gas performs a cycle as shown in figure. If the temperatures are $T_{A} = 600 K, T_{B} = 800 K, T_{C} = 2200 K$ and $T_{D} = 1200 K$ , then the work done for complete cycle is (in kJ)

Discussion

1894.	Liquid A and B form an ideal solution at temperature T. Mole fraction of A in liquid and vapor phase are 0.4 and 413 respectively, when total pressure is 130 torr. The vapor pressure (in torr) of A and B in pure state at temperature T are respectively
Answer» Liquid $A$ and $B$ form an ideal solution at temperature $T$ . Mole fraction of $A$ in liquid and vapor phase are $0.4$ and $\frac{4}{13}$ respectively, when total pressure is $130 torr$ . The vapor pressure (in torr) of $A$ and $B$ in pure state at temperature $T$ are respectively

Discussion

1895.	why is phenyl a secondary radical
Answer» why is phenyl a secondary radical

Discussion

1896.	arrange them in basicity order - (1) CH_3CH_2NH_{2 } (2) CH_3CH_2NHCH_2CH_{3 } (3) CH_3N(CH_3)_{2 }(4) Ph-NH-CH_{
Answer» arrange them in basicity order - (1) CH_3CH_2NH_{2 } (2) CH_3CH_2NHCH_2CH_{3 } (3) CH_3N(CH_3)_{2 }(4) Ph-NH-CH_{

Discussion

1897.	The certainty in velocity of an electron present in the nucleus of diameter 10 to the power -15 meter hypothetically should be approximately?
Answer» The certainty in velocity of an electron present in the nucleus of diameter 10 to the power -15 meter hypothetically should be approximately?

Discussion

1898.	An element of density 7 g cm−3 occurs in bcc structure with cell edge of 300 pm. Calculate the number of atoms present in 200 g of the element.
Answer» An element of density $7 g c m^{- 3}$ occurs in bcc structure with cell edge of $300 p m$ . Calculate the number of atoms present in $200 g$ of the element.

Discussion

1899.	Which of the following is released at anode during electrolysis of aqueous and concentrated copper chloride using inert electrodes?
Answer» Which of the following is released at anode during electrolysis of aqueous and concentrated copper chloride using inert electrodes?

Discussion

1900.	Find the 1st, 2nd & 3rd nearest neighbours of Na+ in NaCl unit cell.
Answer» Find the 1st, 2nd & 3rd nearest neighbours of Na+ in NaCl unit cell.

Discussion

Explore topic-wise InterviewSolutions in .

Arrange F2, Cl2, Br2 and I2 in descending order of reactivity towards ethane

S=q/T , is formula of entropy for reversible process , then why we use it for irrversible process . what is the sign of dlt s [system] for a reaction of melting . it should be + ive right? because the solid absorb heat

How many among the following compound will give both the above result ?i. Cyclohexanone ii. Acetoneiii. Propionaldehyde iv. Acetophenonev. Acetaldehyde vi. Benzophenonevii. Benzaldehyde

The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water isa) 2.5 b)3 c)5 d)7.5

The number of H-bond formed by water molecul

Explain why calamine solution is applied on the skin when an ant bites.

Lactose molecule is made up of β-d (-) galactopyranose and β-d (+) gluco pyraonose. The number of - OH groups present in it are

what is meant by a tengin in graphical representation

Which of the following is true for Modern periodic table?

34. Are all the decomposition reactions endothermic and what are uses of decomposition reaction.

3. What will be the number of waves formed by a bohr electron in one complete revolution in its second Orbit? A. 3 B. 2 C. 1 D. 0

A flask contains CH4(g) and SO2(g) in equal weight ratio. The ratio of number of atoms of CH4 to that of SO2 in the flask is

Which of the following have both polar and non-polar bonds

What happens when Grignard reagent reacts with Hgcl2?

The activation energy of a reaction at a given temperature is found to be 2.303 RT J/mol . The ratio of rate constant to the Arrhenius factor is

Select the one which has largest radius:Mg, Na, Na+, Mg+2, Al

The product (X) is:

Which of the following graphs represents the highest activation energy for a forward reaction if the reaction is endothermic?

For a fixed amount of given gas at temperature and pressure,

A drop of solution (volume = 0.050 mL) contains 6×10−7mol of H3O+ ions. If H3O+ions disappear at a constant rate of 6.0×105 mol L−1S−1, how long will take for the H3O+ ions in the drop to disappear ?

In which of the following alkyl halide is SN2 mechanism is favored the maximum

ntinbegining of reaction A is equlibrium withB+C ,2MMOLOF A taken,out of which 0.5 moleget disscoaited.what is amount of dissociation of A?n

24. Why tyndall effect is more effectively shown by lyophobic colloid?

What is \lbrack H+\rbrack in mol/L of a solution that is 0.20 M CH3COONa and 0.10 M in CH3COOH? (Ka for CH3COOH =1.8x10-5)

The fraction of total volume occupied by the atoms present in a simple cube is?

The enthalpies of formation of Al2O3 and Cr2O3 are −1569 KJ and −1134 KJ respectively. ΔH for the reaction 2Al + Cr2O3 → 2Cr + Al2O3 is

Which of the following isomerism is shown by alkanes?

H2O2 is stored in:

Why there is two hydrogen bond in adenine and thymine but in guanine and cytosibe there is 3 Hydrogen bond

why are 2p electrons attracted more towarsds nucleus than 3s electrons if shielding effect takes plac

if p^ka =4 then vant hoff factor for weak monobasic acid when c=0.01M

1)Calculate n -factor for Al2O3 for the following reaction. Al(excess) +O2 Al2O3 2)If x gram of Al2O3 is formed ,y gram of Al is consumed in the reaction .Find realtion between x and y.( Use concept of gram equivalent).

The central atom in _____ violates the octet rule. Given the atomic number of Se=34, As=33, B=5 and N=7.

Which will be the expected product when excess of reagents are used?

Assertion:- O3 is a good oxidising agent Reason:- O3 very rapidly gives dioxygen

Total number of steroisomers possible for 4-chloropent-2-ene is

The quantum number that is no way related to other quantum number is

100 mL of a buffer solution contains 0.1 M each of weak acid HA and salt NaA. How many grams of NaOH should be added to the buffer so that its pH becomes 6? (Ka of HA=10−5)

71. .(CH3)₂C˙ CH₂CH₃ and (CH₃)₃C˙ among these two free radical which is more stable and why ?

Six moles of an ideal gas performs a cycle as shown in figure. If the temperatures are TA=600 K, TB=800 K, TC=2200 K and TD=1200 K , then the work done for complete cycle is (in kJ)

Liquid A and B form an ideal solution at temperature T. Mole fraction of A in liquid and vapor phase are 0.4 and 413 respectively, when total pressure is 130 torr. The vapor pressure (in torr) of A and B in pure state at temperature T are respectively

why is phenyl a secondary radical

arrange them in basicity order - (1) CH_3CH_2NH_{2 } (2) CH_3CH_2NHCH_2CH_{3 } (3) CH_3N(CH_3)_{2 }(4) Ph-NH-CH_{

The certainty in velocity of an electron present in the nucleus of diameter 10 to the power -15 meter hypothetically should be approximately?

An element of density 7 g cm−3 occurs in bcc structure with cell edge of 300 pm. Calculate the number of atoms present in 200 g of the element.

Which of the following is released at anode during electrolysis of aqueous and concentrated copper chloride using inert electrodes?

Find the 1st, 2nd & 3rd nearest neighbours of Na+ in NaCl unit cell.