HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

What is meant by hydrolysis?

Answer the following :

A solution of CH₃COONH₄ is neutral. why?

Choose the most correct option.

The standard potential of the cell in which the following reaction occurs:
H₂ (g,1 atm) + Cu²⁺ (1M) → 2H⁺ (1M) + Cu_(s),
`("E"_"Cu"^circ = 0.34 "V")` is

Consider the half reactions with standard potentials.

1. \[\ce{Ag^{\oplus}_{ (aq)} + e^{\ominus} -> Ag_{(s)}E^\circ = 0.8 V}\] 
2. \[\ce{I2_{(s)} + 2e^\ominus -> 2I^{\ominus}_{(aq)} E^\circ = 0.53V}\]
3. \[\ce{Pb^{2\oplus}_{(aq)} + 2e^{\ominus} -> Pb_{(s)} E^\circ = -0.13 V}\]
4. \[\ce{Fe^{2\oplus} + 2e^{\ominus} -> Fe_{(s)} E^\circ = -0.44 V}\]

The strongest oxidising  and reducing agents respectively are ______.

Answer the following in one or two sentences.

Write any two functions of salt bridge.

Answer the following in one or two sentences.

What is standard cell potential for the reaction

\[\ce{3Ni_{(s)} + 2Al^{3+} (1M) → 3Ni^{2+} (1M) + 2Al(s)}\], if `E_"Ni"^circ` = –0.25 V and  `"E"_("Al")^circ` = –1.66 V?

Answer the following in one or two sentences.

Write Nernst equation. What part of it represents the correction factor for nonstandard state conditions?

Answer the following in one or two sentences.

Under what conditions the cell potential is called standard cell potential?

Answer the following in one or two sentences.

Formulate a cell from the following electrode reactions:

`"Au"_(("aq"))^(3+) + 3"e"^(-) -> "Au"_(("s"))`

Mg_(s) → `"Mg"_(("aq"))^(2+)` + 2e^-

Answer the following in one or two sentences.

What is the significance of the single vertical line and double vertical line in the formulation galvanic cell?

What is a salt bridge?

Answer the following in brief.

Construct a galvanic cell from the electrodes Co³⁺ | Co and Mn²⁺/Mn. \[\ce{E{^{\circ}_{Co}}}\] = 1.82 V, \[\ce{E{^{\circ}_{Mn}}}\] = –1.18 V. Calculate \[\ce{E{^{\circ}_{cell}}}\]

Answer the following:

Calculate emf of the cell:

Zn_(s) |Zn²⁺ (0.2 M)||H⁺ (1.6 M)| H₂(g, 1.8 atm)| Pt at 25 °C.

Calculate emf of the cell at 25°C.

Zn_(s) | Zn²⁺ (0.08 M) || Cr³⁺ (0.1 M) | Cr_(s)

`E_(Zn)^0` = −0.76 V,  `E_(Cr)^0` = −0.74 V

Answer the following:

Predict whether the following reaction would occur spontaneously under standard state condition.

`"Ca"_(("s")) + "Cd"_(("aq"))^(2+) -> "Ca"_(("aq"))^(2+) + "Cd"_(("s"))`

Answer the following:

Predict whether the following reaction would occur spontaneously under standard state condition.

`2"Br"_(("aq"))^(-) + "Sn"_(("aq"))^(2+) -> "Br"_(2("l")) + "Sn"_(("s"))`

Answer the following.

What is the oxidation state of ‘S’ in H₂SO₄?

Write the names and structural formulae of oxoacids of chlorine.

Answer the following.

What happens when Cl₂ reacts with F₂ in equal volume at 437 K.

Answer the following.

What happens when Br₂ reacts with excess of F₂.