In the reaction of benzene with a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)`, the active species involved is
A. nitrite ion
B. nitrate ion
C. nitronium ion
D. nitric acid.
1 Answers
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Sulphuryl chloride, `SO_(2)Cl_(2)`, reacts with `H_(2)O` to give mixture of `H_(2)SO_(4)` and HCl. Aqueous solution of 1 mol `SO_(2)Cl_(2)` will be ne
Correct Answer - B `underset(1mol)(SO_(2)Cl_(2))+underset(2mol)(2H_(2)O)tounderset(1mol)(H_(2)SO_(4))+underset(2mol)(2HCl)` `underset(1mol)(H_(2)SO_(4))+underset(2mol)(2NaOH)toNa_(2)SO_(4)+H_(2)O` `underset(1mol)(HCl)+underset(1mol)(NaOH)toNaCl+H_(2)xx2` `:.` 1 mol of `SO_(2)Cl_(2)` in aq. solution requires 4 mol of NaOH or 2 mol of `Ca(OH)_(2)`
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Nitrobenzene can be prepared from benzene by using a mixture of conc. `HNO_3` and conc. In the nitrating mixture, `HNO_3` acts as a/an
Correct Answer - A `HNO_(3)` acts as a base as it provides p-nitrophenol. `HNO_(3) Leftrightarrow H^(+)+HSO_(4)` `O_(2)N-OH+H^(+) to NO_(2)^(+)+H_(2)O`
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A reaction `SO_(2)Cl_(2) to SO_(2)+ Cl_(2)` is first order reaction with half life period `3.15 xx 10^(4)`s at `320^(@)`C. What percentage of `SO_(2)C
`k=0.693/t_(1//2)=0.693/(3.15 xx 10^(4)s)= 2.2 xx 10^(-5)s^(-1)` For the first order reaction, `t=2.303/k log a/(a-x)` `k=2.2 xx 10^(-5)s^(-1)`, t=90 min `=90 xx 60=5400s` `(5400s) = 2.303/(2.2 xx 10^(-5)s^(-1)) log a/(a-x)` (5400s)...
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Aniline on heating with conc. `HNO_(3)+` conc. `H_(2)SO_(4)` mixture yields
Correct Answer - C Since `HNO_(3)` is also a strong oxidising agent, therefore, aniline forms tarry oxidation products along with some oxidation products.
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Nitrobenzene can be prepared from benzene by using a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)`. In the nitrating mixture, nitric acid acts as
Correct Answer - A `HNO_(3)+H_(2)SO_(4) rarr NO_(2)^(+)+HSO_(4)^(-)+H_(2)O` In this reaction nitric acid acts like a base.
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Zinc reacts with dilute `H_(2)SO_(4)` to give `H_(2)`. It also reacts with conc. `H_(2)SO_(4)` to give `SO_(2)` . How will you account for this differ
Dilute `H_(2)SO_(4)` behaves as a proton acid and zinc metal displaces hydrogen from the acid. `Zn+H_(2)SO_(4)("dil")to ZnSO_(4)+H_(2)` Concentrated `H_(2)O_(4)` behaves as a strong oxidising agent and itself is reduced to...
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A metal `M` which is not affected by strong acids like conc. `HNO_(3),conc.H_(2)SO_(4)` and conc. Solution of alkalies like `NaOH,KOH` forms `MCI_(3)`
Correct Answer - C `Au to` Noble metal `&` it is used in tonning for photography.
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`SO_(3) (g)` is produced as : `SO_(2) (g) + (1)/(2) O_(2) (g) hArr SO_(3) (g)` At `900 K, 0.2 `mol of `SO_(2)` and 0.4 mol of `O_(2)` are taken in 2L
Correct Answer - C `{:(,SO_(2) (g),+,(1)/(2)O_(2) (g),hArr,SO_(3) (g),T = 900 K,),("Concentration",(0.2)/(2),,(0.4)/(2),,,,),("initially",,,,,,,),("concentration",0.1 - x,,0.2 - (1)/(2) x,,x,,),(,x = 0.08 M,,,,,,),(,,,,,,,):}` `K_(C) = ([SO_(3)])/([SO_(2)] [O_(2)]^(1//2)) = (0.08)/(sqrt(0.16) xx 0.02) = 10`
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Cancerntrated `HNO_(3)` used in the laboratory is usually 69% by mass of `HNO_(3)`. The density of `HNO_(3)`. The density of `HNO_(3)` solution is 1`.
Correct Answer - 15.44 M `"Mass of solution"= 100 g, "Mass os "HNO_(3)=69 g` `"Volume of solution"=(100 g)//(1.41" g cm"^(-3))=70.92 cm^(3)=0.07092 dm^(3)` `"Molar mass of "HNO_(3)=1 +14 +3xx16=63" g mol"^(-1)` `"Molarity...
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Which of the following reactions of benzene does not aC Count for the three `C=C` bonds in the molecule- (a) Benzene`+Br_(2)underset("conc". H_(2)SO_(
Correct Answer - D a and b are the elctrophilic subsitution reactions and do not aC Count for the `C=C` bond reaction
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