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Published on: 19/10/2025
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test
1.
Which of the following shows the right increasing order of reactivity?
CH = CH< CH4<CH2= CH2
\(\mathrm{CH} \equiv \mathrm{CH}<\mathrm{CH}_2=\mathrm{CH}_2<\mathrm{CH}_4\)
\(\mathrm{CH}_4<\mathrm{CH}_2=\mathrm{CH}_2<\mathrm{CH} \equiv \mathrm{CH}\)
\(\mathrm{CH}_4<\mathrm{CH} \equiv \mathrm{CH}<\mathrm{CH}_2=\mathrm{CH}_2\)
2.
Methylene group is
CH4
- CH3
- CH2 -
- CH -
3.
Ethene is an ___________
alkane
alkene
alkyne
aromatic hydrocarbon
4.
General molecular formula of alkynes is ___________.
CnH2n+2
CnH2n
CnH2-n-2
CnH2n+1
5.
Cyclobutane is an example of ______________ compounds.
a cyclic
cyclic
aromatic
alicyclic
6.
Which among the following is / are the properties of organic compounds.
(i) are covalent in nature
(ii) exhibit isomerism
(iii) have low melting and boiling point
(i) and (ii)
(i) and (iii)
(i), (ii) and (iii)
only (iii)
7.
Write the physical properties of ethanoic acid.
8.
Write the structural formula of the following compounds.
(i) C3H6
(ii) C4H6
9.
What is rectified spirit??
10.
Identify saturated and unsaturated compound containing double and triple bond.
(i) C5H12
(ii) C2H2
(iii) C3H8
(iv) C4H8
11.
Write a test to alkanes from alkenes.
12.
What are hydrocarbons?
13.
(i) Does structures (A) and (B) represent the same compound?
(ii) Name them.
14.
Name the above compound and classify it
15.
Define heterocyclic compounds. Give an example.
16.
A to F are the structural formulae of some organic compounds:
(i) Give the letters which represent the same family.
(ii) Give the letters which do not represent hydrocarbons.
(iii) Flow can 'C' be converted into A?
17.
An organic compound A of molecular formula C2H4 on reduction gives another compound B of molecular formula C2H6. B on reaction with chlorine in the presence of sunlight gives C of molecular formula C2H5Cl.
(a) Name the compounds A, B and C.
(b) Write chemical equation for the conversion of A to B and name the type of reaction
18.
Fill the blanks in the table using IUPAC nomenclature of organic compounds.
| Name of the compound | Structural formula | Functional group present |
| Propan-2-ol | ||
| Ethanal | ||
| Butanone | ||
| Butanoic acid |
19.
Compound A is a colourless, crystalline, hydrated salt of Magnesium. On heating it
becomes an anhydrous salt. The number of water molecules lost by compound A is
equal to the number of water molecules present in green vitriol, on heating.
a) Identify compound A.
b) Give the chemical equation for this heating reaction.
20.
Write the balanced equation for the following
i) Dehydration of ethanol
ii) Dehydrogenation of ethanol
iii) Decarboxylation of ethanoic acid
1.
(c)
\(\mathrm{CH}_4<\mathrm{CH}_2=\mathrm{CH}_2<\mathrm{CH} \equiv \mathrm{CH}\)
2.
(c)
- CH2 -
3.
(b)
alkene
4.
(c)
CnH2-n-2
5.
(d)
alicyclic
6.
(c)
(i), (ii) and (iii)
7.
a) Ethanoic acid is a colourless liquid having unpleasant odour.
b) It is sour in taste.
c) It is miscible with water in all proportions.
d) It's boiling point is higher than the corresponding alcohols, aldehydes and ketones.
e) On cooling, pure ethanoic acid is frozen to form ice like flakes. They look glaciers. So it is called Glacial Acetic Acid.
8.
| (i) | C3H6 | - | CH3CH = CH2 Propane | |
| (ii) | C4H6 | - | CH3 - CH2 - C ≡ CH 1 - Butyne CH3 - C ≡ C - CH3 2 - Butyne |
Isomers |
9.
Aqueous solution of ethanol which contain 95.5% of ethanol and 4.5% of water is called rectified spirit.
10.
(i) Pentane - Saturated
(ii) Ethyne - Unsaturated triple bond
(iii) Propane - Saturated
(iv) Butene - Unsaturated double bond
11.
(i) Unsaturated compounds like alkenes decolourize bromine water.
(ii) Saturated compounds like alkanes do not decolourize bromine water
12.
The organic compounds that are composed of only carbon and hydrogen atoms are called hydrocarbons.
13.
(i) Yes
(ii) Furan
14.
Cyclobutane - Alicyclic compound.
15.
If the chain contains carbon and other atoms like oxygen, nitrogen, sulphur, etc., these compounds are called heterocyclic compounds.
16.
(i) Letters 'B' and 'D' represent the family of alkynes.
(ii) Letters 'E' and 'F' do not represent any hydrocarbon.
(iii) 'C' can be converted into 'A' by passing hydrogen (H2) in the presence of Ni at 473 K.
.JPG)
17.
The compound A of molecular formula C2H4 is an alkene. Upon reduction with hydrogen, it gives 'B' of molecular formula C2H6. The compound 'B' upon chlorination given 'C' of molecular formula C2H5Cl.
18.
| Name of the compound | Structural formula | Functional group present |
| Propan-2-ol | C3H8O | \(-\mathrm{OH}\) |
| Ethanal | CH3 CHO | O=C - H |
| Butanone | CH3C(O)CH2CH3 | Ketone( ) |
| Butanoic acid | \(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{COOH}\) | -COOH |
19.
i) \(\mathrm{MgSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}\)
ii) \(\begin{array}{c}
\mathrm{MgSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{MgSO}_4+7 \mathrm{H}_2 \mathrm{O} \\
\left(\text { Green vitriol } \rightarrow \mathrm{FeSO}_4, 7 \mathrm{H}_2 \mathrm{O}\right)
\end{array}\)
20.
i) Dehydration of ethanol
\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \xrightarrow[{443K}]{conc.{H}_{2}S{O}_{4}} \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O}\)
ii) Dehydrogenation of ethanol
\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \underset{573 \mathrm{~K}}{\stackrel{\mathrm{Cu}}{\longrightarrow}} \mathrm{CH}_{3} \mathrm{CHO}+\mathrm{H}_{2}\uparrow\)
iii) Decarboxylation of ethanoic acid
\(\mathrm{CH}_{3} \mathrm{COONa} \stackrel{\mathrm{NaOH}+\mathrm{CaO}}{\longrightarrow} \mathrm{CH}_{4} \uparrow+\mathrm{Na}_{2} \mathrm{CO}_{3}\)
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