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

Name and draw the structure of the repeating unit in natural rubber.

Write the structure of isoprene and the polymer obtained from it.

Identify the chiral molecule from the following.

Identify chiral molecule/s from the following.

a.

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

b.

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

c.

\[\ce{CH3 - CH2 - CH2 - CH2 Br}\]

d.

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

Write the formula for tetra ammine platinum (ii) chloride.

Write formulae of the following complex.

Potassium amrriine trichloroplatinate (ii)

Write formulae of the following complex.

Dicyanoaurate (i) ion

How will you represent first order reactions graphically?

What are ideal and non-ideal solutions?

Why are aliphatic amines are stronger bases than ammonia?

What is the order of following ligands in naming complex?

1. chloro
2. diaqua

Name the compound which reacts with formaldehyde to produce ethyl alcohol.

What is aqua regia?

A solution is prepared by mixing equal volumes of 0.1 M MgC1₂ and 0.3 M Na₂C₂O₄ at 293 K. Will MgC₂O₄ precipitate out?  (K_sp of MgC₂O₄ at 293K is 8.56 × 10^-5)

What is dextrorotatory substance?

What is base centred (or end-centred) unit cell?

The vapour pressures of two liquids A and B are 80 mmHg and 60 mm Hg respectively at 25°C. What is the vapour pressure of the solution obtained by mixing 3 moles of A and 2 moles of B?

The science which deals with the design and synthesis of material on nanoscale with different size and shape is called ______.

The correct sequence of the atomic layers in cubic close packing is ______.

Which one of the following elements does NOT belong to first transition series?