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Published on: 01/06/2021
QB365 provides detailed and simple solution for every Book back Questions in class 12 Chemistry Subject. It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test1.
Which of the following relation is correct for degree of hydrolysis of ammonium acetate?
\(h=\sqrt { \frac { { K }_{ h } }{ C } } \)
\(h=\sqrt { \frac { { K }_{ a } }{ K_b } } \)
\(h=\sqrt { \frac { { K }_{ w } }{ { K }_{ a }.{ K }_{ b } } } \)
\(h=\sqrt { \frac { { { K }_{ a }.{ K }_{ b } } }{ { K }_{ w } } } \)
2.
The hydrogen ion concentration of a buffer solution consisting of a weak acid and its salts is given by _______.
\([{ H }^{ + }]=\frac { { K }_{ a }[acid] }{ [salt] } \)
\([{ H }^{ + }]={ K }_{ a }[salt]\)
\([{ H }^{ + }]={ K }_{ a }[acid]\)
\([{ H }^{ + }]=\frac { { K }_{ a }[salt] }{ [acid] } \)
3.
The pH of an aqueous solution is Zero. The solution is _______.
slightly acidic
strongly acidic
neutral
basic
4.
Which of the following can act as Lowery – Bronsted acid well as base?
HCl
SO42−
HPO42−
Br-
5.
H2PO4- the conjugate base of _______.
PO43−
P2O5
H3PO4
HPO42-
1.
(c)
\(h=\sqrt { \frac { { K }_{ w } }{ { K }_{ a }.{ K }_{ b } } } \)
2.
According to Henderson equation
pH = pKa + log [Acid]/[Salt]
i.e., -log [H+] = - log Ka + log [Acid]/[Salt]
-log [H+] = log [Acid]/[Salt] x 1/ Ka
log 1/[H+] = log [Acid]/[Salt] x 1/ Ka
[H+] = Ka [Acid]/[Salt]
3.
pH = -log10 [H+]
\(\therefore\) [H+] = 10-pH
100 = 1
[H+] = 1 M
The solution is strongly acidic
4.
HPO42− can have the ability to accept a proton to form H2PO4-
It can also have the ability to donate a proton to form PO4-3
5.
H3PO4 + H - OH ⇌ H3O+ + H2PO4-
acid 1 base 1 acid 2 base 2
\(\therefore\) H2PO4- the conjugate base of H3PO4
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