HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

A mixture of two liquids A and B have vapour pressures 3.4 × 10⁴ Mn^-2 and 5.2 × 10⁴ Nm^-2. If the mole fraction of A is 0.85, find the vapour pressure of the solution.

Differentiate between polysaccharides and polypeptides.

The following data were obtained during the decomposition of SO₂Cl₂ at the constant volume. SO₂Cl₂ →SO_2(g) + Cl_2(g)

Calculate the rate constant of the reaction.

During the electrolysis of aqueous NaCl, the gas liberated at the cathode is ______.

Phenol is reduced to ______ on heating with zinc dust.

Identify the chiral molecule from the following.

Identify chiral molecules from the following.

a.

\[\begin{array}{cc}
\ce{CH3 - CH - CH2 - CH3}\\
|\phantom{.........}\\
\ce{OH}\phantom{.......}
\end{array}\]

b.

\[\begin{array}{cc}
\ce{CH3 - CH2 - CH - CH2 - CH3}\\
|\phantom{..}\\
\ce{Br}\phantom{.}
\end{array}\]

c.

\[\begin{array}{cc}
\ce{CH3 - CH2 - CH2 - CH2 - Br}
\end{array}\]

d.

\[\begin{array}{cc}
\ce{CH3 - CH - CH3 - CH3}\\
|\phantom{.........}\\
\ce{CH3}\phantom{.......}
\end{array}\]

Explain Williamson's synthesis.

Slove: \[\ce{2NOBr -> 2NO_{2(g)} + Br_{2(g)}}\]

For the above reaction, the rate law is rate = k[NOBr]². If the rate of reaction is 6.5 × 10⁻⁶ mol L⁻¹ s⁻¹ at 2 × 10⁻³ mol L⁻¹ concentration of NOBr, calculate the rate constant k for the reaction.

The IUPAC name of [Fe(CO)₅] is ______.

What is polysaccharides?

Write two examples of polysaccharides.

The solutions that obey Raoult's law over entire range of concentrations are ______.

Write the name of the monomer of natural rubber.

Another name of terylene is ______.

The rate constant for the reaction:

\[\ce{2N2O_{(s)} ->2N2O4_{(g)}}\] is 4.98 × 10^-4 s^-1.

The order of the reaction is ______.

How much coulomb is one faraday?

Write the equation for integrated rate law for a first order reaction.

Show that `t_(1/2)= 0.693/k` for first reaction.

Write the unit of rate constant [k] for the first order reaction.