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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 3501. |
A sample of 0.50 g of an organic compound was treated according to kjeldahl's method.The ammonia evolved was absorbed in50 ml of 0.5 M sulphuric acid .The residual acid required 60 ml of 0.5 M solution of NaOH for neutralization.Find the percentage composition of nitrogen in the compound? |
| Answer» A sample of 0.50 g of an organic compound was treated according to kjeldahl's method.The ammonia evolved was absorbed in50 ml of 0.5 M sulphuric acid .The residual acid required 60 ml of 0.5 M solution of NaOH for neutralization.Find the percentage composition of nitrogen in the compound? | |
| 3502. |
100 ml of tap water containing Ca(HCO_3)_2 was titrated with N/50 HCl with methyl orange as indicator. If 30 ml of HCl was required, calculate the temporary hardness as parts of CaO_3 per 10^{6 }parts of water. (1) 150 ppm (2) 600 ppm (3) 450 ppm (4) 300 ppm |
| Answer» 100 ml of tap water containing Ca(HCO_3)_2 was titrated with N/50 HCl with methyl orange as indicator. If 30 ml of HCl was required, calculate the temporary hardness as parts of CaO_3 per 10^{6 }parts of water. (1) 150 ppm (2) 600 ppm (3) 450 ppm (4) 300 ppm | |
| 3503. |
State the meaning of functional group in a carbon compound. Write the functional group present in (i) ethanol and (ii) ethanoic acid and also draw their structures |
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Answer» State the meaning of functional group in a carbon compound. Write the functional group present in |
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| 3504. |
The n-factor of H3PO3 in the given reaction is:H3PO3 + NaOH → NaH2PO3 + H2Options:Should have chosen 1Wrong 234The n-factor of H3BO3 if it is acting as an acid in the reaction isOptions:Should have chosen 12Wrong 30 |
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Answer» The n-factor of H3PO3 in the given reaction is: H3PO3 + NaOH → NaH2PO3 + H2 Options: Should have chosen 1 Wrong 2 3 4 The n-factor of H3BO3 if it is acting as an acid in the reaction is Options: Should have chosen 1 2 Wrong 3 0 |
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| 3505. |
Draw the structural formula of the following and give their IUPAC names.(i) Chloroform(ii) Ethanoic acid(iii) Formaldehyde |
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Answer» Draw the structural formula of the following and give their IUPAC names. |
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| 3506. |
Which of the following is not correct for isomers? |
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Answer» Which of the following is not correct for isomers? |
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| 3507. |
39 Molar conductivity of 1M acetic acis at 298K and infinite dilution is 75 and 425 ohm-1 cm2 mol -1 respectively. The degree of dissociation of acetic acid is |
| Answer» 39 Molar conductivity of 1M acetic acis at 298K and infinite dilution is 75 and 425 ohm-1 cm2 mol -1 respectively. The degree of dissociation of acetic acid is | |
| 3508. |
If 'x' is the degree of dissociation of weak dibasic organic acid and 'y' is the hydrogen ion concentration, what is the initial concentration of acid? |
| Answer» If 'x' is the degree of dissociation of weak dibasic organic acid and 'y' is the hydrogen ion concentration, what is the initial concentration of acid? | |
| 3509. |
What is the electronic configuration of chloride ion? |
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Answer» What is the electronic configuration of chloride ion? |
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| 3510. |
In which of the following reaction white precipitate is obtained? |
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Answer» In which of the following reaction white precipitate is obtained? |
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| 3511. |
What is Avogadro's law? Write its mathematical value. |
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Answer» What is Avogadro's law? Write its mathematical value. |
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| 3512. |
What happens when dil. sulphuric acid is poured on a copper plate? |
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Answer» What happens when dil. sulphuric acid is poured on a copper plate? |
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| 3513. |
Hydrogen chloride gas on thermal decomposition gives: |
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Answer» Hydrogen chloride gas on thermal decomposition gives: |
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| 3514. |
What would be the frequency of the wave if it has wavelength of 100 nm? Speed of light = 3×108 m/s |
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Answer» What would be the frequency of the wave if it has wavelength of 100 nm? |
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| 3515. |
if we change the 'length' and 'area of cross section of subs†an ce , then resis†an ce of conductor will change or not . if yes then explain . |
| Answer» if we change the 'length' and 'area of cross section of subs†an ce , then resis†an ce of conductor will change or not . if yes then explain . | |
| 3516. |
Question 1 (a)Classify the following as chemical or physical changes: a. Cutting of trees |
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Answer» Question 1 (a) Classify the following as chemical or physical changes: a. Cutting of trees |
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| 3517. |
What is the name of the indicator which can be used for testing the pH of a solution ? |
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Answer» What is the name of the indicator which can be used for testing the pH of a solution ? |
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| 3518. |
Question 5Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar, filtered tea. |
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Answer» Question 5 Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar, filtered tea. |
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| 3519. |
An element has 10 electrons and 12 neutrons. What is the mass number of this element? |
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Answer» An element has 10 electrons and 12 neutrons. What is the mass number of this element? |
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| 3520. |
Isolation of compounds from plants to be used as drugs was the ________________________________________________________________________________________________________________________________________ |
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Answer» Isolation of compounds from plants to be used as drugs was the ____________________________________________________________________ ____________________________________________________________________ |
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| 3521. |
Why can't carbon form ionic compounds? How can they form long chains of carbon. |
| Answer» Why can't carbon form ionic compounds? How can they form long chains of carbon. | |
| 3522. |
30. When a radioactive substance is kept in a vessel, the atmosphere around it is rich WITH-------- A)Ne B)Ar C)Xe D)He |
| Answer» 30. When a radioactive substance is kept in a vessel, the atmosphere around it is rich WITH-------- A)Ne B)Ar C)Xe D)He | |
| 3523. |
A+B2→AB+BIn the above reaction, the half life is independent of initial concentration of A and is directly proportional to the initial concentration of B2. The rate law is: |
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Answer» A+B2→AB+B In the above reaction, the half life is independent of initial concentration of A and is directly proportional to the initial concentration of B2. The rate law is: |
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| 3524. |
Define covalent bond.(definition) |
| Answer» Define covalent bond.(definition) | |
| 3525. |
Electroplating of chromium is done on |
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Answer» Electroplating of chromium is done on |
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| 3526. |
Q2. A solution of sodium chloride discharges 6.1 × 10 power16 Na+ and 4.6 × 10 power16 Cr- ions in 2sec. Find the current passing through the solution. |
| Answer» Q2. A solution of sodium chloride discharges 6.1 × 10 power16 Na+ and 4.6 × 10 power16 Cr- ions in 2sec. Find the current passing through the solution. | |
| 3527. |
Number of functional groups present in the following compound is: |
Answer» Number of functional groups present in the following compound is: |
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| 3528. |
Are BCl3 and SiCl4 electron deficient compounds.Explain? |
| Answer» Are BCl3 and SiCl4 electron deficient compounds.Explain? | |
| 3529. |
2Na + 2CH3CH2OH → _______ +H2 |
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Answer» 2Na + 2CH3CH2OH → _______ +H2 |
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| 3530. |
Which of the following are uses of ethanol? |
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Answer» Which of the following are uses of ethanol? |
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| 3531. |
which one of the following pairs of species contains tge ions having same hybridisation of the central atoms (1)NO_2^- and NH_2^- (2)N{O^-}_2 and N{O^-}_3 (3)N{H^+}_4 and N{O^-}_3 (4)SCN^{- andd N{H^{}}_2 |
| Answer» which one of the following pairs of species contains tge ions having same hybridisation of the central atoms (1)NO_2^- and NH_2^- (2)N{O^-}_2 and N{O^-}_3 (3)N{H^+}_4 and N{O^-}_3 (4)SCN^{- andd N{H^{}}_2 | |
| 3532. |
36. Moles of KClO3 required for producing sufficient O2 to react with 1 mole of Al will be |
| Answer» 36. Moles of KClO3 required for producing sufficient O2 to react with 1 mole of Al will be | |
| 3533. |
Which of the following has higher melting point?(i) Sugar (ii) Salt |
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Answer» Which of the following has higher melting point? (i) Sugar (ii) Salt |
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| 3534. |
Iron, copper, lead, aluminium among these which of the metals can be drawn into wires |
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Answer» Iron, copper, lead, aluminium among these which of the metals can be drawn into wires |
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| 3535. |
What happens when ethyne reacts with iodine in the presence of alcohol? |
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Answer» What happens when ethyne reacts with iodine in the presence of alcohol? |
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| 3536. |
Question 9(b)Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is(b) strongly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration. |
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Answer» Question 9(b) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is (b) strongly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration. |
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| 3537. |
Maximum electron in 5^{th }shell having m_{l }=-4 will be |
| Answer» Maximum electron in 5^{th }shell having m_{l }=-4 will be | |
| 3538. |
An empty evaporating dish weighs 20.0g. After adding saturated solution of NaNO3, the dish weighs 66.0g. When evaporated to dryness the dish with crystals weighs 41.5g. Find the solubility of NaNO3 at 200C. |
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Answer» An empty evaporating dish weighs 20.0g. After adding saturated solution of NaNO3, the dish weighs 66.0g. When evaporated to dryness the dish with crystals weighs 41.5g. Find the solubility of NaNO3 at 200C. |
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| 3539. |
88.Salts of A ( atomic mass 7 ), B ( atomic mass 27) and C (atomic mass 64) were electrolysed under identical conditions using the same quantity of electricity. It was found that when 2.1 g of A was deposited, the weights of B and C deposited were 2.7 g and 9.6 g. The valencies of A, B and C are respectively : (a) 3, 1 and 2 (b) 1, 3 and 2 (c) 3, 1 and 3 (d) 2, 3 and 2. |
| Answer» 88.Salts of A ( atomic mass 7 ), B ( atomic mass 27) and C (atomic mass 64) were electrolysed under identical conditions using the same quantity of electricity. It was found that when 2.1 g of A was deposited, the weights of B and C deposited were 2.7 g and 9.6 g. The valencies of A, B and C are respectively : (a) 3, 1 and 2 (b) 1, 3 and 2 (c) 3, 1 and 3 (d) 2, 3 and 2. | |
| 3540. |
Lewis-Kossel structure of N2 is |
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Answer» Lewis-Kossel structure of N2 is |
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| 3541. |
If a cuboidal carton has length 80 cm, breadth 40 cm and height 60 cm, then the volume of the carton is . |
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Answer» If a cuboidal carton has length 80 cm, breadth 40 cm and height 60 cm, then the volume of the carton is |
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| 3542. |
What should be the physical state of lead bromide if it is to conduct electricity? |
| Answer» What should be the physical state of lead bromide if it is to conduct electricity? | |
| 3543. |
Give reason as to why-the electrolysis of acidulated water is considered to be an example of catalysis. |
| Answer» Give reason as to why-the electrolysis of acidulated water is considered to be an example of catalysis. | |
| 3544. |
If 1 g of solute dimerise upto 75% in 100 g of H2O and show depression in freezing point by 0.093∘C. Find average molecular weight of solute (in g) after dimerisation.(Given: The freezing point depression constant of water is Kf(H2O)=1.86 ∘C/m) |
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Answer» If 1 g of solute dimerise upto 75% in 100 g of H2O and show depression in freezing point by 0.093∘C. Find average molecular weight of solute (in g) after dimerisation. (Given: The freezing point depression constant of water is Kf(H2O)=1.86 ∘C/m) |
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| 3545. |
What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively? |
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Answer» What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively? |
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| 3546. |
ntZn rod is placed in 100 ml of 1M CuSO4 solution so that molarity of Cu2+ changes to 0.7M .Molarity of SULPHATE at this state will ben nt1-1Mn nt2-0.8Mn nt3-O.7Mn nt4-1.8Mn |
| Answer» ntZn rod is placed in 100 ml of 1M CuSO4 solution so that molarity of Cu2+ changes to 0.7M .Molarity of SULPHATE at this state will ben nt1-1Mn nt2-0.8Mn nt3-O.7Mn nt4-1.8Mn | |
| 3547. |
Question 41.What are strong and weak acids ? In the following list of acids, separate strong acids from weak acids, Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. |
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Answer» Question 41. What are strong and weak acids ? In the following list of acids, separate strong acids from weak acids, Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. |
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| 3548. |
Sulphuric acid when poured over zinc releases ___________ gas. |
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Answer» Sulphuric acid when poured over zinc releases ___________ gas. |
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| 3549. |
What do you observe when caustic soda solution is added to the following solution: first a little and then in excess(a) FeCl3(b) ZnSO4(c) Pb(NO3)2(d) CuSO4 |
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Answer» What do you observe when caustic soda solution is added to the following solution: first a little and then in excess (a) FeCl3 (b) ZnSO4 (c) Pb(NO3)2 (d) CuSO4 |
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| 3550. |
Identify polar molecules among the following molecules. |
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Answer» Identify polar molecules among the following molecules. |
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