SSC (Marathi Semi-English) इयत्ता १० वी - Maharashtra State Board Important Questions for Science and Technology 1

Write the chemical formula of rust.

Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.

Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS

Complete the following flow chart. 

Complete the correlation:

Alkene : C = C :: Alkyne: _______.

Define Hydrocarbons.

The unsaturated hydrocarbons containing a carbon-carbon double bond are called _______.

The general molecular formula for the homologous series of alkynes is _______.

Write the molecular formula of the given compound.

Ethyl ethanoate

Cyclohexane is a branched chain type of hydrocarbon.

Distinguish between:

Saturated hydrocarbons - Unsaturated hydrocarbons

Identify the type of chemical reaction given below:

\[\ce{2Mg + O2 -> 2MgO}\]

Identify saturated and unsaturated hydrocarbons from the given structural formula:

Draw electron dot structure for the following:

\[\begin{array}{cc}
\phantom{}\ce{H}\phantom{..}\ce{H}\phantom{}\\
\phantom{}|\phantom{...}|\phantom{}\\
\ce{H-C-C-H}\\
\phantom{}|\phantom{...}|\phantom{}\\
\phantom{}\ce{H}\phantom{..}\ce{H}\phantom{}
\end{array}\]

Draw electron dot structure for the following:

\[\begin{array}{cc}
\phantom{..}\ce{H}\phantom{........}\ce{H}\phantom{.}\\
\phantom{.}\backslash\phantom{......}/\phantom{}\\
\ce{C = C}\\
\phantom{}/\phantom{......}\backslash\phantom{}\\
\phantom{}\ce{H}\phantom{........}\ce{H}\phantom{}
\end{array}\]

Define Homologous series.

In the presence of the acid catalyst, ethanoic acid reacts with ethanol and ______ ester is produced.

The reaction between acetic acid and sodium carbonate is shown in the following figure.

Answer the questions with the help of a diagram.

1. Which gas does come out as effervescence in the big test tube?
2. What is the colour change in the lime water present in the small test tube?
3. Write the related reaction.

Ethanoic acid reacts with the basic salt, sodium carbonate, to form a salt, named ______, water and carbon dioxide gas.