InterviewSolution
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InterviewSolution
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.
| 1. |
An organic compound which produces a bluish green colored flame on heating in the presence of copper isA. benzaldehydeB. benzoic acidC. anilineD. Chlorobenzene |
| Answer» Correct Answer - D | |
| 2. |
The reaction of nitroprusside anion with sul- phide ion gives purple colouration due to the formation ofA. the tetranionic complex of iron (II) coordinating to one `NOS^(-)` ionB. the dianionic complex of iron (II) coordinating to one `NCS^(-)` ionC. the trianionic complex of iron (III) coordinating to one `NOS^(-)` ionD. the tetranionic complex of iron (III) coordinating to one `NCS^(-)` ion |
| Answer» Correct Answer - A | |
| 3. |
`0.30g` of an organic compound containing `C, H`, and `O` an combustion yields `0.44g` of `CO_(2)` and `0.18g` of `H_(2) O`. If its molecular mass is `60 mu` the molecular mass is formula will be |
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Answer» Correct Answer - `C_(2)H_(4)O_(2)` Empirical formula is `CH_(2)O` |
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| 4. |
`0.0833 `mol of carbohydrate of empirical formula `CH_(2)O` contain `1 g ` of hydrogen. The molecular formula of the carbohydrate isA. `C_(5)H_(10)O_(5)`B. `C_(3)H_(4)O_(3)`C. `C_(12)H_(22)O_(11)`D. `C_(6)H_(12)O_(6)` |
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Answer» Correct Answer - D 1 mole of carbohydrate will contain `(1)/(0.0833)g` of hydrogen i.e., 12 g hydrogen. `:.` The molecular formula of the compound will be `C_(6)H_(12)O_(6)`. |
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| 5. |
A gaseous hydrocarbon gives upon combustion `0.72g` of water and `3.08g` of `CO_(2)`. The empirical formula of the hydrocarbon isA. `C_(7)H_(8)`B. `C_(2)H_(4)`C. `C_(3)H_(4)`D. `C_(6)H_(5)` |
| Answer» Correct Answer - A | |
| 6. |
Empirical formula of a compound is `CH_(2)O` and its molecular mass is 90. The molecular formula of the compound isA. `C_(3)H_(6)O_(3)`B. `C_(2)H_(4)O_(2)`C. `C_(6)H_(12)O_(6)`D. `CH_(2)` |
| Answer» Correct Answer - A | |
| 7. |
`0.256` g of some nitrogenous compound was kjeldahlised and produced `0.155` g of ammonia. The % of nitrogen in the organic compound is approximatelyA. 5B. 30C. 50D. 80 |
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Answer» Correct Answer - C `0.17g NH_(3)` will contain `((14)/(17) xx 0.17)g` of nitrogen, i.e., 0.14g of nitrogen % Nitrogen `= ("Mass of nitrogen")/("Mass of compound") xx 100 = (0.14)/(0.28) xx 100 = 50%` |
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| 8. |
Which of the following reagents is used for the separation of acetaldehyde from acetophenone?A. `NH_(2)OH`B. `NaOHI_(2)`C. `NaHSO_(3)`D. `C_(6)H_(5)NHNH_(2)` |
| Answer» Correct Answer - C | |
| 9. |
In an organic compound, the phosphorus is estimated as:A. `Mg_(2)P_(2)O_(7)`B. `Mg_(3)(PO_(4))_(2)`C. `H_(3)PO_(4)`D. `P_(2)O_(5)` |
| Answer» Correct Answer - A | |
| 10. |
Equivalent mass of an organic acid can be determined by :A. silver salt methodB. cryoscopic methodC. ebullioscopic methodD. platinichloride method |
| Answer» Correct Answer - A | |
| 11. |
The violet colour in the Lassaigne’s test of sulphur is due toA. `Na_(2)[Fe(CN)_(5)S]`B. `Na_(2)[Fe(CN)_(5)NO]`C. `Na_(2)[Fe(CN)_(6)]`D. `Na_(4)[Fe(CN)_(5)NOS]` |
| Answer» Correct Answer - D | |
| 12. |
Equivalent mass of an organic base can be determined by:A. silver salt methodB. depression in freezing pointC. elevation in boiling pointD. platinichloride method |
| Answer» Correct Answer - D | |
| 13. |
The blood red colour in the combination test of nitrogen and sulphur in organic compound is due to the formation of:A. ferric sulpho cyanideB. ferric acetateC. ferrous sulpho cyanideD. ferric cyanide |
| Answer» Correct Answer - A | |
| 14. |
Nitrogen containing organic compound when fused with sodium metal forms:A. `NaNO_(2)`B. `NaCN`C. `NaNH_(2)`D. `NaNC` |
| Answer» Correct Answer - B | |
| 15. |
Which of the following sodium compound is/are formed when as organic compound containing both nitrogen and sulphur is fused with sodium?A. Cyanide and sulphideB. ThiocyanateC. Sulphite and cyanideD. Nitrate and sulphide |
| Answer» Correct Answer - B | |
| 16. |
When N and S both are present in an organic compound, the sodium extract with `FeCl_(3)` givesA. green colourB. blue colourC. yellow colourD. red colour |
| Answer» Correct Answer - D | |
| 17. |
Prussian blue colour is obtained by mixing together aqueous solution of `Fe^(3+)` salt with:A. ferricyanideB. ferrocyanideC. hydrogen cyanideD. sodium cyanide |
| Answer» Correct Answer - B | |
| 18. |
In the estimation of sulphur organic compound on treating with conc. `HNO_(3)` is converted toA. `SO_(2)`B. `H_(2)S`C. `H_(2)SO_(3)`D. `H_(2)SO_(4)` |
| Answer» Correct Answer - D | |
| 19. |
In a compound `C, H, N` atoms are present in `9:1:3.5` by weight. Molecular weight of compound is `108`. Its molecular formula is: |
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Answer» Correct Answer - `C_(6)H_(8)N_(2)` Empiricalformula is `C_(3)H_(4)N` |
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| 20. |
An organic compound was analysed by dumas method. 0.45 gm of the compound on combustion gave 48.6 ml nitrogen at `27^@C` and 756 mm pressure. Calculate the percentage composition of the compound. |
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Answer» `V_(1)=48.6mL" "V_(2)=?` `P_(1) = 756 mm" "P_(2) = 760 mm` `T_(1) = 27 +273" "T_(2) = 273 K = 300K` Applying general gas equation, `(P_(1)V_(1))/(T_(1)) = (P_(2)V_(2))/(T_(2))` Volume of nitrogen at `STP, V_(2) = (P_(1)V_(1))/(T_(1)).(T_(2))/(P_(2))` `= (756 xx 48.6)/(300) xx (273)/(760)` `= 43.99mL` Mass of organic compound `= 0.45g` Percentage of nitrogen in the compound `= (28)/(22400) xx (V_(2))/(W) xx 100` `= (28)/(22400) xx (43.99)/(0.45) xx 100` `=12.22%` |
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| 21. |
An organic compound has C and H percentage in the ratio 6:1 and C and O percentage in the 3:4. The compound isA. `HCHO`B. `CH_(3)OH`C. `CH_(3)CH_(2)OH`D. `(COOH)_(2)` |
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Answer» Correct Answer - A % ratio of `C:H` is `6:1` and % ratio of `C:O` is `3:4`. So, % ratio of `C:H:O` is `6:1:8`. Therefore % of C comes to be `3.33%` of H is 6.66 and % of O is 3.33. Simplest ratio of `C:H:O` is `1:2:1`, i.e, `CH_(2)O`. |
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| 22. |
In Carius method of estimation of halogens `250 mg` of an organic compound gave `141 mg` of `AgBr`. The percentage of bromine in the compound is (atomic mass `Ag = 108, Br = 80`)A. 48B. 60C. 24D. 36 |
| Answer» Correct Answer - C | |
| 23. |
A compound containing only carbon, hydrogen and oxygen has molecular mass of 44.0. On complete oxidation, it is converted into a compound of molecular mass 60.0. The compound is :A. an aldehydeB. an acidC. an alcoholD. an ether |
| Answer» Correct Answer - A | |
| 24. |
An organic compound having molecular mass `60` is found to contain `C = 20%, H = 6.67%`, and `N = 46.67%`, while rest is oxygen. On heating, it gives `NH_(3)` along with a solid residue. The solid residue gives violet color with alkaline copper sulphate solution. The compounds isA. `CH_(3)NCO`B. `CH_(3)CONH_(2)`C. `(NH_(4))_(2)CO`D. `CH_(3)CH_(2)CONH_(2)` |
| Answer» Correct Answer - C | |