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Questions asked by mosymeow_1
Questions
355
questions
0
answers selected
Which of the following is not applicable to chemisorption?
jeemain
aipmt
chemistry
surface-chemistry
class12
unit5
easy
biology
asked
Dec 14, 2013
1
answer
According to Freundlich adsorption isotherm, which of the following is correct?
jeemain
aipmt
chemistry
surface-chemistry
class12
unit5
easy
biology
asked
Dec 14, 2013
1
answer
Which adsorption takes place at low temperature?
jeemain
aipmt
chemistry
surface-chemistry
class12
unit5
easy
biology
asked
Dec 14, 2013
1
answer
Pd can adsorb in the space between its atoms, 900 times its volume of hydrogen. This porcess is called
jeemain
aipmt
chemistry
surface-chemistry
class12
unit5
easy
biology
asked
Dec 14, 2013
1
answer
Which of the following statements is correct about Langmuir's adsorption?
jeemain
aipmt
chemistry
surface-chemistry
class12
unit5
easy
biology
asked
Dec 14, 2013
1
answer
The $pK_a$ of weak acid (HA) is 4.5 . The $pOH$ of an aqueous buffered solution of HA in which 50% of acid is ionized is
jeemain
chemistry
aipmt
equilibrium
easy
q100
biology
asked
Nov 27, 2013
1
answer
Which of the following ionic species has the greatest protons affinity to form stable compound?
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
easy
q99
biology
asked
Nov 27, 2013
2
answers
The solubility of $A_2X_3$ is y mol $dm^{-3}$. Its solubility product is
jeemain
chemistry
equilibrium
aipmt
easy
q98
asked
Nov 27, 2013
1
answer
When $0.1\; mol$ of $CH_3NH_2$ (ionisation constant, $K_b = 5 \times 10^{-4}$) is mixed with $0.08\;mol\; HCl$ and the volume is made up to $1\; L$ find the [$H^+$] of resulting solution,
jeemain
chemistry
equilibrium
aipmt
difficult
q97
biology
asked
Nov 27, 2013
1
answer
$H_3BO_3$ is
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
difficult
q96
biology
asked
Nov 27, 2013
2
answers
The $pH$ of $\frac{M}{100}$ NaOH solution is:
chemistry
jeemain
equilibrium
aipmt
easy
q95
biology
asked
Nov 27, 2013
1
answer
Ammonium acetate which is 0.01 M, is hydrolysed to 0.001 M concentration. Calculate the change in $pH$ in 0.001 M solution, if initially $pH = pK_a$
jeemain
chemistry
equilibrium
aipmt
difficult
q94
biology
asked
Nov 27, 2013
1
answer
When solid lead iodide is added to water, the equilibrium concentration of $I^-$ becomes $2.6 \times 10^{-3}$M. What is the $K_{sp}$ for $PbI_2$
jeemain
chemistry
aipmt
equilibrium
difficult
q89
biology
asked
Nov 27, 2013
1
answer
For a concentrated solution of a weak electrolytic $A_xB_y$ of concentration C, the degree of dissociation $\alpha$ is given by
jeemain
chemistry
equilibrium
aipmt
difficult
q93
biology
asked
Nov 27, 2013
1
answer
A solution has $pH$ = 5 is to be diluted 100 times then it will become
jeemain
chemistry
equilibrium
aipmt
difficult
q92
biology
asked
Nov 27, 2013
1
answer
$K_{sp}$ of $Mg(OH)_2$ is $1 \times 10^{-12}$, 0.01 M $Mg^{+}$ will precipitate at the limiting $pH$ of
jeemain
chemistry
equilibrium
aipmt
easy
q91
biology
asked
Nov 27, 2013
1
answer
Equal volume of the follwing $Ca^{2+}$ and $F^-$ solutions are mixed. In which of the follwing solutions will precipitation occur?
jeemain
chemistry
equilibrium
aipmt
difficult
q90
biology
asked
Nov 27, 2013
1
answer
What is the correct relationship between the $pH$s of isomolar solutions of sodium oxide ($pH_1$), sodium sulphide ($pH_2$), sodium selenide ($pH_3$) and sodium telluride ($pH_4$)?
jeemain
chemistry
aipmt
equilibrium
easy
q88
biology
asked
Nov 27, 2013
1
answer
The rapid change of $pH$ near the stoichiometric point of an acid-base titration is the basis of indicator detection. $pH$ of the solution is related to ratio of the concentration of the conjugated acid(HIn) and base (In) form of the indicator by the expression
jeemain
chemistry
difficult
equilibrium
aipmt
q87
biology
asked
Nov 27, 2013
1
answer
The $pH$ value of gastric juice in human stomach is about 1.8 and in the small intestine it is about 7.8. The $pK_a$ value of aspirin is 3.5. Aspirin will be
sat
chemistry
chemical-equilibrium
jeemain
easy
equilibrium
aipmt
q86
biology
asked
Nov 27, 2013
1
answer
If equilibrium constant of the reaction of weak acid $HA$ with $NaOH$ is $10^9$, then $pH$ of $0.1\; M\; NaA$ is
jeemain
chemistry
equilibrium
aipmt
difficult
q85
biology
asked
Nov 27, 2013
1
answer
If freezing point of 0.1 M aqueous weak monobasic acid is $-0.2046^\circ C$, then $pH$ of solution is [$K_f (H_2O) = 1.86 kg mol^{-1}$]
jeemain
aipmt
equilibrium
chemistry
medium
q84
biology
asked
Nov 27, 2013
1
answer
$pH$ of a mixture of 1 M benzoic acid ($pK_a$ = 4.20) and 1 M solution benzoate is 4.5. In 300 mL of buffer solution, volume of benzoic acid solution is
sat
chemistry
chemical-equilibrium
jeemain
equilibrium
aipmt
difficult
q83
biology
asked
Nov 27, 2013
1
answer
Percentage ionisation of a weak monobasic acid can be calculated by using the formula
jeemain
chemistry
aipmt
equilibrium
difficult
q82
biology
asked
Nov 27, 2013
2
answers
To prepare a buffer of $pH$ 8.26 amount of $(NH_4)_2SO_4$ to be added into 50 mL of 0.01 M $NH_4OH$ solution is [$pK_a (NH_4^+)$ = 9.26]
jeemain
chemistry
aipmt
equilibrium
difficult
q81
biology
asked
Nov 27, 2013
1
answer
Assuming 100% ionization in case of strong electrolytes which of the following will have minimum $pH$?
jeemain
chemistry
aipmt
equilibrium
medium
q80
biology
asked
Nov 27, 2013
1
answer
$pH$ of $Ca(OH)_2$ solution is 12. Millimoles of ($Ca(OH)_2$) present in 100 mL of solution will be
jeemain
chemistry
equilibrium
aipmt
medium
q79
biology
asked
Nov 27, 2013
1
answer
Both $HCOOH$ and $CH_3COOH$ solutions have equal $pH$. If $\frac{K_1}{K_2}$ (ratio of acid ionisation constants) of these acids is 4, their molar concentration ratio will be
jeemain
chemistry
aipmt
equilibrium
difficult
q78
biology
asked
Nov 27, 2013
1
answer
For the reaction $S_2O_3^{2-} (aq) + 2H_3O^+ (aq) \rightleftharpoons S (s) + H_2SO_3 (aq) + H_2O(l)$; Rate = $k [H_3O^+][S_2O_3^{2-}]$. Reaction is fastest in
jeemain
chemistry
equilibrium
aipmt
medium
q77
biology
asked
Nov 27, 2013
1
answer
Which of the following mixtures will act as a buffer solution when dissolved in 50 mL of water?
jeemain
chemistry
equilibrium
aipmt
medium
q76
biology
asked
Nov 27, 2013
1
answer
Which of the following solutions will have $pH$ of 4.74?
jeemain
chemistry
equilibrium
aipmt
difficult
q75
biology
asked
Nov 27, 2013
1
answer
BOH is a weak base. Molar concentration of BOH provides a [OH^-] of $1.5 \times 10^{-3}$ M is [Given $K_b$ (BOH) = $1.5 \times 10^{-3}$]
jeemain
chemistry
equilibrium
aipmt
medium
q74
biology
asked
Nov 27, 2013
1
answer
100 mL of $pH$ =6 solution is diluted to 100 mL by water. $pH$ of the solution will increase by
jeemain
chemistry
aipmt
equilibrium
difficult
q73
biology
asked
Nov 27, 2013
1
answer
$pH$ of 0.01 M $(NH_4)_2SO_4$ and 0.02 M $NH_4OH$ buffer ($pK_a$ of $NH_4^+$ = 9.26) is
jeemain
aipmt
equilibrium
chemistry
medium
q72
biology
asked
Nov 27, 2013
1
answer
A weak base, B has basicity constant, $K_b = 2 \times 10^{-5}$. The $pH$ of any solution in which $[B] = [BH^+]$ is
jeemain
aipmt
chemistry
equilibrium
difficult
q71
biology
asked
Nov 27, 2013
1
answer
$pH$ at which an acidic indicator with $K_{in} = 1 \times 10^{-5}$ changes colour when the indicator is $1 \times 10^{-3}$ M is
jeemain
aipmt
chemistry
equilibrium
medium
q70
biology
asked
Nov 27, 2013
1
answer
$pH$ of the solution containing 50.0 mL of 0.3 M HCl and 50.0 mL of 0.4 M $NH_3$ is
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
difficult
q69
biology
asked
Nov 27, 2013
1
answer
$pK_{a1}, pK_{a2}$ and $pK_{a3}$ of $H_3PO_4$ are respectively x, y and z. $pH$ of 0.1 M $Na_2HPO_4$ solution is
jeemain
aipmt
equilibrium
chemistry
medium
q68
biology
asked
Nov 27, 2013
1
answer
$pK_{a1}$ and $pK_{a2}$ of $H_2CO_3$ are 6.38 and 10.26 respectively. The $pH$ of 1 M and 0.1 M $NaHCO_3$ are
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
medium
q67
biology
asked
Nov 27, 2013
1
answer
Hydrolysis constant of $NH^+_4$ is $5.55 \times 10^{-10}$. The ionisation constant of $NH^+_4$ is
jeemain
chemistry
equilibrium
aipmt
difficult
q66
biology
asked
Nov 27, 2013
1
answer
$pK_b$ of $NH_3$ is 4.74. The $pH$ when 100 mL of 0.01 M $NH_3$ solution is 50% neutralised by 0.01 M HCl is,
jeemain
aipmt
equilibrium
chemistry
medium
q65
biology
asked
Nov 27, 2013
1
answer
$K_a$ for HCN is $5 \times 10^{-10}$ at $25^\circ C$. How much volume of 5 M KCN solution is required to be added to 10 mL of 2 M HCN in order to maintain $pH$ = 9
jeemain
aipmt
chemistry
equilibrium
medium
q64
biology
asked
Nov 27, 2013
1
answer
The hydronium ion concentration in pure water is $1 \times 10^{-7}$ mol$L^{-1}$. The degree of dissociation of water is
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
medium
q63
biology
asked
Nov 27, 2013
1
answer
The dissociation constant of $H_2S$ and $HS^-$ are respectively $10^{-7}$ and $10^{-13}$. The $pH$ of 0.1 M aqueous solution of $H_2S$ will be
jeemain
aipmt
equilibrium
chemistry
medium
q62
biology
asked
Nov 27, 2013
1
answer
To 10 mL of aqueous solution some strong acid having $pH$ = 2 is mixed with $pH$ = 4.0. The $pH$ of resulting solution is
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
easy
q61
biology
asked
Nov 27, 2013
1
answer
The dissociation constant of certain weak acid HA is $1 \times 10^{-4}$. The equilibrium constant for its reaction with strong base BOH is
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
difficult
q60
mock
biology
asked
Nov 27, 2013
1
answer
The $pH$ of 0.1 M solution of $NH_4OH$ (having dissociation constant $K_b = 1.0 \times 10^{-5})$ is equal to
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
easy
q59
biology
asked
Nov 27, 2013
1
answer
A solution was prepared by dissolving 0.0005 mol of $Ba(OH)_2$ in 100 mL of the solution. If the base is assumed to ionise completely, the $pOH$ of the solution will be
sat
chemistry
chemical-equilibrium
jeemain
aipmt
equilibrium
easy
q58
biology
asked
Nov 27, 2013
1
answer
The $pH$ of a solution is 5.00. To this solution, sufficient acid is added to lower the $pH$ to 2.00. The corresponding increase in $H_3O^+$ ion concentration is
jeemain
aipmt
chemistry
equilibrium
easy
q57
biology
asked
Nov 27, 2013
1
answer
$M_2SO_4$ ($M^+$ is monovalent metal ion) has a $K_{sp}$ of $3.2 \times 10^{-5}$ at 298 K. The maximum concentration of $SO^{2-}_4$ ion that could be attained in a saturated solution of this solid at 289 K is
jeemain
aipmt
chemistry
equilibrium
medium
q56
biology
asked
Nov 27, 2013
1
answer
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