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

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Stable oxidation states for chromiom are ________.

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Which of the following sets of ions contain only paramagnetic ions?

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Formula for the compound sodium hexacynoferrate (III) is ____________.

When an excess of AgNO₃ is added to the complex, one mole of AgCl is precipitated. The formula of the complex is ______.

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The sum of coordination number and oxidation number of M in [M(en)₂C₂O₄]Cl is _____________.

The correct order of increasing reactivity of C-X bond towards nucleophile in the following compounds is:

(I)

(II)

(III) (CH₃)₃ C-X

(IV) (CH₃)₂ CH-X

Answer the following in one or two sentences.

Name the Lewis acids and bases in the complex [PtCl₂ (NH₃)₂].

\[\ce{CH3 - CH = CH2 ->[HI][Peroxide]}\]

The major product of the above reaction is,

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The best method for the preparation of alkyl fluorides is _______.

Butanenitrile may be prepared by heating ______.

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Choose the compound from the following that will react fastest by S_N1 mechanism

The product ‘B’ in the above reaction sequence is,

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Which of the following is likely to undergo racemization during alkaline hydrolysis?

(I)

\[\begin{array}{cc}
\ce{CH3-CH-C2H5}\\
|\\
\ce{Cl}\end{array}\]

(II)

(III) 

(IV)

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

Match the pairs.

In the following resonating structures A and B, the number of unshared electrons in valence shell present on oxygen respectively are ______.

In the following resonating structures A and B, the number of unshared electrons in valence shell present on oxygen respectively are ______.

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In the Wolff-Kishner reduction, alkyl aryl ketones are reduced to alkyl benzenes. During this change, ketones are first converted into ______.

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In the Wolff-Kishner reduction, alkyl aryl ketones are reduced to alkyl benzenes. During this change, ketones are first converted into ______.

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Aldol condensation is

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Aldol condensation is