Arrhenius Acid

Q.

pH of water at ${25}^{\circ }C$ is 7. If water is heated to ${70}^{\circ }C$.

1. pH will decrease and water becomes acidic

2. pH will decrease and water becomes basic

3. pH remains constant at 7

4. pH will decrease and water remains neutral

Q.

In Castner Kellner cell:

1. Hg is anode and carbon is cathode

2. Hg is cathode and carbon is anode

3. Carbon is anode and cathode

4. Hg is cathode and anode

Q. 3. Aromatic compounds can be halogenated using molecular halogen in the presence of an acid. Benzene when treated with molecular bromine in the presence of ferric chloride gives bromobenzene. Naphthalene undergoes bromination with bromine in acetic acid. The kinetics of this reaction is interesting. The kinetic expression involves a term that is second order in bromine for the reaction in glacial acetic acid, and first order in bromine for the reaction in 50% aqueous acetic acid. Naphthalene: Aluminium chloride is much more active Lewis acid than ferric chloride and the halogenations can be carried out using AlCl3. The bond energies of Al-Cl and Al-Br are 502 kJ mol1 and 430 kJ mol1, respectively. The correct statement(s) is/are (A) The reaction of benzene with bromine in the presence of AlCl3 gives a substantial amount of chlorobenzene. (B) The reaction of naphthalene with bromine in the presence of glacial acetic acid involves reaction of two molecules of bromine with one molecule of naphthalene, and no involvement of acetic acid, in the rate determining step. (C) The reaction of naphthalene with bromine in 50% aqueous acetic acid involves bromine and acetic acid in the rate determining step. (D) When 1-methylnaphthalene is reacted with bromine in the presence of a Lewis acid 4-bromo-1-methylnaphthalene is formed as the major product.

Q. Calculate the $pOH$ and $pH$ of a 0.1 M $C{H}_{3}COOH$ solution ($K_a$ = $1.8\times {10}^{-5}$). There is $7.5\times {10}^{-3}\%$ yield of $O{H}^{-}$ ions in the given reaction $C{H}_{3}CO{O}^{-}+H_{2}O\rightleftharpoons C{H}_{3}COOH+O{H}^{-}$

1. 5.13, 8.87

2. None of the options are correct

3. 6.12, 7.88

4. 4.12, 9.88

Q.

In early classes i have learned that anode is positive end and cathode is negative. but in redox reactions in daniel cell its saying that cathode is positive and anode is negative. why?

Q. pH of 10^-8 M HCl is

Q. pH of 1M HCl i

Q. Which of the following compounds are diprotic 1.H_2PO_5 2.H_2S 3.HClO_3 4.H_3PO_4

Q. 65 What happens when So2 is passed through an aqueous solution of Fe(111) salt?

Q. When 10 ml of 0.1 M acetic acid (pK_a =5.0) is titrated against 10 ml of 0.1 M ammonia solution (pK_b =5.0) , the equivalence point occurs at pH- (1) 5.0 (2) 6.0 (3) 7.0 (4) 9.0

Q. 28.If a certain solution process is endothermic and the solution is subsequently diluted then, 1.more heat will be absorbed by the same solution from the surrounding 2.more heat will be liberated to the surrounding 3. No heat will be absorbed or liberated

Q. 25. In (PO4)3- ion , the formal charge on each O2 atom and P-O bond order respectively are 1)-0.75, 0.6 2)-0.75, 1.0 3)-0.75, 1.25 4)-3, 1.25

Q. 77.What will be the equivalent mass of hcl in the reaction : k2cr2o7+14hcl--->2kcl + 2crcl3 + 3cl2 + h2O. Detailed explanation. Describe how to determine the n factor of HCl in the reaction

Q. ntNO2 is an odd electron species. What is bond order of N O in NO2 ?n

Q.

$PbO+2NaOH\to$ ______ $+H_{2}O$

1. Na₂PbO

2. Na₂PbO₄

3. None of these

4. Na₂PbO₃

Q.

Equal volumes of 10%$\frac{v}{v}$ of HCl is mixed with 10%$\frac{v}{v}$ NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

1. Basic

2. Neutral

3. Acidic

4. Can't be predicted

Q. Species that increases the concentration of $H^{+}$ and $O{H}^{-}$ ions in aqueous solution are called:

1. Bronsted-Lowry acid and Bronsted-Lowry base
2. Lewis acid and Lewis base
3. Arrhenius acid and Arrhenius base
4. All of the above.

Q.

Equal volumes of 10%$\frac{v}{v}$ of HCl is mixed with 10%$\frac{v}{v}$ NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

1. Basic

2. Neutral

3. Acidic

4. Can't be predicted

Q. Why is equilibrium constant of hydrolysis (Kh) not effected by concentration of salt of weak acid weak base.

Q. most stable free radical is 1.CH2=CH-C†extbullet H2 2.Ph-C†extbullet H2 3.(CH3)3C†extbullet 4.†extbullet C2h5

Q.

Arrange the following in the increasing order of acidity and name the property which decides the order:

CH₃COOH, CH₃OH, C₆H₅OH