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

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.

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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.

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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

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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 _______.

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Which of the following have d⁰s⁰ configuration?

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In which of the following series all the elements are radioactive in nature?

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Write the probable electronic configuration of chromium and copper.

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The oxidation state of cobalt ion in the complex [Co(NH₃)₅ Br]SO₄ is __________.

Answer the following in one or two sentences.

What is the shape of a complex in which the coordination number of the central metal ion is 4?

Write the structure and IUPAC name of the major product in the following reaction.

\[\begin{array}{cc}
\ce{CH3 - CH - CH2Cl + NaI ->[Acetone]}\\
|\phantom{..................}\\
\ce{CH3\phantom{...............}}
\end{array}\]

Write the structure and IUPAC name of the major product in the following reaction.

\[\ce{CH3 - CH2Br + SbF3 ->}\]

Write the structure and IUPAC name of the major product in the following reaction.

\[\begin{array}{cc}
\ce{CH3 - CH - CH = CH2 + HBr ->[peroxide]}\\
|\phantom{........................}\\
\ce{CH3\phantom{.....................}}
\end{array}\]