Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Chemistry

The more positive the value of E^Θ, the greater is the tendency of the species to get reduced. Using the standard electrode potential of redox couples given below find out which of the following is the strongest oxidising agent.

E^Θ values: \[\ce{Fe^{3+} / Fe^{2+} = + 0.77; I2 (s) / I- = + 0.54}\];

\[\ce{Cu^{2+} / Cu = + 0.34; Ag+ / Ag = + 0.80V}\]

Using the standard electrode potential, find out the pair between which redox reaction is not feasible.

E^Θ values: \[\ce{Fe^{3+} / Fe^{2+} = + 0.77; I2/I- = + 0.54}\];

\[\ce{Cu^{2+} / Cu = + 0.34; Ag+ / Ag = + 0.80 V}\]

Thiosulphate reacts differently with iodine and bromine in the reactions given below:

\[\ce{2S2O^{2-}3 + I2 -> S4O^{2-}6 + 2I-}\]

\[\ce{S2O^{2-}3 + 2Br2 + 5H2O -> 2SO^{2-}4 + 2Br- + 10H+}\]

Which of the following statements justifies the above dual behaviour of thiosulphate?

Identify the correct statement (s) in relation to the following reaction:

\[\ce{Zn + 2HCl -> ZnCl2 + H2}\]

(i) Zinc is acting as an oxidant.

(ii) Chlorine is acting as a reductant.

(iii) Hydrogen ion is acting as an oxidant.

(iv) Zinc is acting as a reductant.

Which of the following electrodes will act as anodes, when connected to Standard Hydrogen Electrode?

(i) \[\ce{Al/Al^{3+}; E^Θ = –1.66}\]

(ii) \[\ce{Fe/Fe^{2+}; E^Θ = – 0.44}\]

(iii) \[\ce{Cu/Cu2+ ; E^Θ = + 0.34}\]

(iv) \[\ce{F2 (g)/2F– (aq); E^Θ = + 2.87}\]

On the basis of standard electrode potential values, suggest which of the following reactions would take place? (Consult the book for E^Θ value).

\[\ce{Cu + Zn^{2+} -> Cu^{2+} + Zn}\]

On the basis of standard electrode potential values, suggest which of the following reactions would take place? (Consult the book for E^Θ value).

\[\ce{Mg + Fe^{2+} -> Mg^{2+} + Fe}\]

On the basis of standard electrode potential values, suggest which of the following reactions would take place? (Consult the book for E^Θ value).

\[\ce{Br2 + 2Cl- -> Cl2 + 2Br-}\]

On the basis of standard electrode potential values, suggest which of the following reactions would take place? (Consult the book for E^Θ value).

\[\ce{Fe + Cd^{2+} -> Cd + Fe^{2+}}\]

Which method can be used to find out strength of reductant/oxidant in a solution? Explain with an example.

Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

Why is water molecule polar?

Dead burnt plaster is ______.

Suspension of slaked lime in water is known as ______.

A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is ______.

Which of the following statements is true about Ca(OH)₂?

Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl₂6H₂O, BaCl₂.2H₂O, SrCl₂.2H₂O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?

Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?

(i) Na₂CO₃

(ii) NaHCO₃

(iii) NaOH

(iv) NaCl

Match the elements given in Column I with the properties mentioned in Column II.

When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step.