The acidic strength of two monobasic acids may be compared by comparing the hydronium ion concentrations of their aqueous solution of same molar concentration. The dissociation constants of acids HA and HB are `4 xx 10^(-6)` and `2.5 xx 10^(-9)`, respectively. How many times HA is stronger than HB ? Assume that for both the acids, the degree of dissociation at the concentration take, is negligible.
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If 10g of A(molar mass = 20g) reacts with 30g of B(molar mass = 30 g) according to following steps. Step-I `A+3BrarrC+2D` Step-II `D+2Erarr5F` Calcula
Correct Answer - 2 `{:(,A,+,3B,rarr,C+2D,),("Mass",10g,,30g,,,),("Mole",(1)/(2),,1,,,),("Mole S.C.",(1)/(2),,(1)/(3),,,):}` Produced moles of `D = (2)/(3) xx 1` `therefore` Produced moles of `F = (5)/(1) xx(2)/(3)xx(60)/(100)=2`
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Which of the following is correct order of lewis acidic strength.
Correct Answer - D `M_(1)V_(1)=M_(2)V_(2)` `5xxV_(1) = 0.1 xx 250` `V_(1) = 5 ml` `V_(H_(2)O)=250-5=245 ml = 0.245 L`
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If pH of an acidic indicator solution when `50%` ionized is 2. Calculate % of basic form in the solution when `[H^(+)]` = `5xx10^(-3)` in solution at
Correct Answer - D `AlF_(3) rarr` ionic solid (following octet rule) `PCl_(3).NH_(4)^(+)rarr` following actet rule `SF_(4) rarr` Hypervalent `(10e^(-))`
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A mixture of an acid anhydride (A) and a monobasic acid (B) on heating produces another monobasic acid (C) of equivalent weight 74 and an anhydride (D
Acid anhydride (A) +`underset((CF_(3) "group")) ("Monobasic acid (B)")` `hArr`Monobasic acid(C ) +`underset((Two CF_(3) "group")) ("Anhydride(D)")` Eq. wt.=128 Eq. wt.=74 Probable formula of acid (B)=`CF_(3)(CH_(2))_(n)COOH` Equivalent weight of (B) =`("Molecular weight")/("Basicity")`...
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0.067 molar aqueous solution of a binary electrolyte `A^(+)B^(-)` shows 2.46 atm osmotic pressure at `27^(@)C` . What fraction of `A^(+)B^(-)` remains
Correct Answer - 0.03
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Consider the three solvents of identical molar masses. Match their boiling point with their `K_(b)` values `{:(ul(bar("Solvents" " ""Boiling point" "
Correct Answer - `0.23^(@)C`
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Two bar magnets of length 0.1m and poles strength 75m each, are placed on the same line. The distance between their centres is 0.2 m. what is the reul
Correct Answer - (i) `3.4 xx 10^(-2)N` (attraction) (ii) `3.4 xx 10^(-2)N` (repulsion)
2 Answers 2 views
Two bar magnets of length `0.1` m and pole strength `75 Am` each , are placed on the same line . The distance between their centres is `0.2` m . What
Correct Answer - `(i) 3.4 xx 10^(-2) N` (attraction ) , (ii) ` 3.4 xx 10^(-2)` N (repulsion)
2 Answers 8 views
In comparing the resistance of two coils P and Q with the help of a metre-bridge arrangement, a balance point is obtained when the sliding contact is
Correct Answer - `5:12,170cm`
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Comparing L-C oscillation with the oscillation if spring-block-system, match the following table. Comparing L-C oscillations with the oscillations of
Correct Answer - (A) Q, (B) T, (C) R, (D) T
2 Answers 1 views