HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is

When 6.3 g of sodium bicarbonate is added to 30 g of acetic acid solution, the residual solution is found to weigh 33 g. The number of moles of carbon dioxide released in the reaction is

Choose the disproportionation reaction among the following redox reactions.

Total number of electrons present in 1.7 g of ammonia is

The correct increasing order of the oxidation state of sulphur in the anions \[\ce{SO^2-_4, SO^2-_3, S2O^2-_4, S2O^2-_6}\] is

Which of the following contains the same number of carbon atoms as in 6 g of carbon-12.

What do you understand by the term oxidation number?

Distinguish between oxidation and reduction.

Hydrogen peroxide is an oxidising agent. It oxidises ferrous ion to ferric ion and reduced itself to water. Write a balanced equation.

Balance the following equation by the oxidation number method.

\[\ce{K2Cr2O7 + Kl + H2SO4 -> K2SO4 + Cr2(SO4)3 + I2 + H2O}\]

Balance the following equation by the oxidation number method.

\[\ce{KMnO4 + Na2SO3 -> MnO2 + Na2SO4 + KOH}\]

Balance the following equation by the oxidation number method.

\[\ce{Cu + HNO3 -> Cu(NO3)2 + NO2 + H2O}\]

Balance the following equation by the oxidation number method.

\[\ce{KMnO4 + H2C2O4 + H2SO4 -> K2SO4 + MnSO4 + CO2 + H2O}\]

Balance the following equation by the ion electron method.

\[\ce{KMnO4 + SnCl2 + HCl -> MnCl2 + SnCl4 + H2O + KCl}\]

Balance the following equation by the ion electron method.

\[\ce{C2O^2-_4 + Cr2O^2-_7 -> Cr^3+ + CO2}\] (in acid medium)

Balance the following equation by the ion electron method.

\[\ce{Na2S2O3 + I2 -> Na2S4O6 + NaI}\]

Balance the following equation by the ion electron method.

\[\ce{Zn + NO^-_3 ->Zn^2+ + NO}\] (in acid medium)

Ionic hydrides are formed by ________.

Non-stoichiometric hydrides are formed by __________.

The hybridisation of oxygen atom is H₂O and H₂O₂ are, respectively