Carbon and its Compounds - Class 10 - Science
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Back Questions - Carbon and its Compounds | NCERT | Science | Class 10
Ethane, with the molecular formula $\mathrm{C}_{2} \mathrm{H}_{6}$ has
(a) 6 covalent bonds.
(b) 7 covalent bonds.
(c) 8 covalent bonds.
(d) 9 covalent bonds.
Ethane $\mathrm{C}_{2} \mathrm{H}{6}$ consists of two carbon atoms and six hydrogen atoms. In ethane, each carbon atom forms four covalent bonds: three with hydrogen atoms and one with another carbon atom.
Let's count the covalent bonds:
Each carbon atom has 3 bonds with hydrogen atoms, totalling $3 \times 2 = 6$ carbon-hydrogen bonds.
There is 1 carbon-carbon bond.
Adding these together gives the total number of covalent bonds in ethane: $$ 6 (\mathrm{C}-\mathrm{H}) + 1 (\mathrm{C}-\mathrm{C}) = 7 \text{ covalent bonds.} $$
So, the correct answer is: (b) 7 covalent bonds.
Butanone is a four-carbon compound with the functional group
(a) carboxylic acid.
(b) aldehyde.
(c) ketone.
(d) alcohol.
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Sign up nowWhile cooking, if the bottom of the vessel is getting blackened on the outside, it means that
(a) the food is not cooked completely.
(b) the fuel is not burning completely.
(c) the fuel is wet.
(d) the fuel is burning completely.
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Sign up nowExplain the nature of the covalent bond using the bond formation in $\mathrm{CH}_{3} \mathrm{Cl}$.
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Sign up nowDraw the electron dot structures for
(a) ethanoic acid.
(b) $\mathrm{H}_{2} \mathrm{~S}$.
(c) propanone.
(d) $\mathrm{F}_{2}$.
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Sign up nowWhat is an homologous series? Explain with an example.
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Sign up nowHow can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?
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Sign up nowWhy does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
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Sign up nowWhy are carbon and its compounds used as fuels for most applications?
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Sign up nowExplain the formation of scum when hard water is treated with soap.
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Sign up nowWhat change will you observe if you test soap with litmus paper (red and blue)?
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Sign up nowWhat is hydrogenation? What is its industrial application?
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Sign up nowWhich of the following hydrocarbons undergo addition reactions: $\mathrm{C}_{2} \mathrm{H}_{6}, \mathrm{C}_{3} \mathrm{H}_{8}, \mathrm{C}_{3} \mathrm{H}_{6}, \mathrm{C}_{2} \mathrm{H}_{2}$ and $\mathrm{CH}_{4}$.
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Sign up nowGive a test that can be used to differentiate between saturated and unsaturated hydrocarbons.
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Sign up nowExplain the mechanism of the cleaning action of soaps.
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Sign up nowExtra Questions - Carbon and its Compounds | NCERT | Science | Class 10
How many bonds are there in $CO_2$ molecule?
A) $1$
B) $2$
C) $3$
D) $4$
The molecule carbon dioxide ($CO_2$) consists of one carbon atom double bonded to two oxygen atoms. Here is how the molecule is typically structured:
Carbon forms two double bonds, one with each of the two oxygen atoms.
Therefore, there are two double bonds in a $CO_2$ molecule.
Answer: B) $2$.
The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9% phosphorus, and 39% oxygen. Find the empirical formula of the compound."
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Sign up nowHow many electrons does a carbon atom share with another carbon atom in the formation of an acetylene molecule?
A Three
B Two
C One
D Four
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Sign up now$10 , \mathrm{dm}^{3}$ of $\mathrm{N}_{2}$ gas and $10 , \mathrm{dm}^{3}$ of gas $X$ at the same temperature contain the same number of molecules and have the same mass. The gas $X$ is:
A $\mathrm{CO}_{2}$
B $\mathrm{CO}$
C $\mathrm{H}_{2}$
D $\mathrm{N}$
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Sign up nowThe product obtained on passing excess carbon dioxide through lime water is
A) $\mathrm{CaCO}{3}$ B) $\mathrm{Ca}\left(\mathrm{HCO}{3}\right){2}$ C) $\mathrm{CaHCO}{3}$ D) $\mathrm{Ca}{2}\mathrm{CO}{3}$
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