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Is Matter Around Us Pure — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure4 Marks
Question
There are three liquids $A, B$ and $C$, all having different densities and different boiling points. Liquids $A$ and $C$ are organic in nature whereas liquid $B$ is considered to be inorganic. When liquids $A$ and $B$ are put together in a container, they form a single layer. On the other hand, when liquids $B$ and $C$ are mixed, they form two separate layers:
$a.$ Which process will you use to separate a mixture of $A$ and $B$ ?
$b.$ Which method will you use to separate a mixture of $B$ and $C$ ?
$c.$ Name the liquids which would behave like $(i) a (ii) B$ and $(iii) C .$
✓

Answer

a. Liquid $A$ is organic and liquid $B$ is inorganic. When mixed, they form a single layer, i.e., they are miscible liquids. So, we will use fractional distillation to separate the mixture of liquid $A$ and liquid $B$.
b. Liquid $B$ is inorganic and liquid $C$ is organic. We will use a separating funnel to separate the mixture of liquid $B$ and liquid $C$ as they form two different layers.
c.
i. Liquid $A$ is organic. When liquid $A$ and liquid $B$ are put together in a container, they form a single layer. So, alcohol would behave like liquid $A$.
ii. Liquid $B$ is inorganic. So, water would behave like liquid $B$.
iii. Liquid $C$ is organic. When liquid $B$ and liquid $C$ are mixed together, they form two separate layers. Oil would behave like liquid $C$.

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(1) Identify the correct statement
Statement $1$ – Dalton’s atomic theory suggested that the atom was indivisible and indestructible.
Statement $2$ – Electrons and protons are present inside the atom.
Statement $3$ – $J.J.$ Thomson was the first one to propose a model for the structure of an atom.
Statement $4$ – Protons are positively charged particle.
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$(c)$ Both $1$ & $2$
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$(b)$ John Dalton
$(c)$ $E.$ Rutherford
$(d)$ Neilsbhore
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$(b)$ Complex permanent tissue
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$(d)$ Complex Meristematic tissue
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Statement $2$ – The electrons revolve around the nucleus in circular paths.
Statement $3$ – Nearly all the mass of an atom resides in the nucleus.
Statement $4$ – The size of the nucleus is very small as compared to the size of the atom.
$(a)$ Only $2$
$(b)$ Both $3$ & $4$
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