HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

Answer the following in one sentence :

Why cations are Lewis acids?

Answer the following in brief :

What are acids and bases according to Arrhenius theory?

Answer the following in brief :

What is meant by conjugate acid-base pair?

Label the conjugate acid-base pair in the following reaction:

\[\ce{HCl + H2O ⇌ H3O\overset{\oplus} + Cl\overset{\ominus}{}}\]

Label the conjugate acid-base pair in the following reaction:

\[\ce{CO^2-_3 + H2O ⇌ OH- + HCO^-_3}\]

Answer the following in brief :

Write a reaction in which water acts as a base.

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Ammonia serves as a Lewis base whereas AlCl₃ is Lewis acid. Explain.

Choose the most correct option.

Two solutions have the ratio of their concentrations 0.4 and ratio of their conductivities 0.216. The ratio of their molar conductivities will be ______.

What is a cell constant? What are its units? How is it determined experimentally?

Answer the following in one or two sentences.

Write the relationship between conductivity and molar conductivity and hence unit of molar conductivity.

Answer the following in brief.

Explain the effect of dilution of the solution on conductivity.

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What is Kohlrausch law of independent migration of ions? How is it useful in obtaining molar conductivity at zero concentration of a weak electrolyte? Explain with an example.

Answer the following in one or two sentences.

What is the relationship between coefficients of reactants in a balanced equation for an overall reaction and exponents in the rate law? In what case the coefficients are the exponents?

Answer the following in one or two sentences.

What is the rate-determining step?

A reaction takes place in two steps:

1. \[\ce{NO_{(g)} + Cl2_{(g)} -> NOCl2_{(g)}}\]
2. \[\ce{NOCl2_{(g)} + NO_{(g)} -> 2NOCl_{(g)}}\]

1. Write the overall reaction.
2. Identify the reaction intermediate.
3. What is the molecularity of each step?

Answer the following.

The first ionization enthalpies of S, Cl, and Ar are 1000, 1256 and 1520 kJ/mol^-1, respectively. Explain the observed trend.

Explain the trend in following atomic properties of group 16 elements:

Atomic radii

Answer the following.

Explain the trend in following atomic properties of group 16 elements:

Ionisation enthalpy

Explain the trend in following atomic properties of group 16 elements:

Electronegativity

Choose the most correct option.

Electronic configuration of Cu and Cu¹⁺ are _______.