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Meghalaya Board of School Education (MBOSE) Class 12th Chemistry Sample Paper Exam 2026
1. The crystal lattice in which all sides and all angles are equal is called
a) Orthorhombic
b) Cubic
c) Monoclinic
d) Tetragonal
View Answer
Cubic.
2. A solution that cannot dissolve any more solute at a given temperature is called
a) Unsaturated
b) Supersaturated
c) Saturated
d) Dilute
View Answer
Saturated.
3. The S.I. unit of molarity is
a) mol L-1
b) mol kg-1
c) g L-1
d) kg mol-1
View Answer
mol L-1.
4. Which property is a colligative property?
a) Boiling point elevation
b) Density
c) Refractive index
d) Viscosity
View Answer
Boiling point elevation.
5. The unit of cell constant is
a) ohm
b) ohm-1
c) cm
d) cm-1
View Answer
cm-1.
6. The oxidation number of Fe in Fe2O3 is
a) +2
b) +3
c) +1
d) 0
View Answer
+3.
7. The rate of a chemical reaction increases with
a) decrease in temperature
b) increase in temperature
c) addition of inert gas
d) decrease in concentration of reactant
View Answer
Increase in temperature.
8. Which one acts as a catalyst in the contact process for the manufacture of sulphuric acid?
a) Fe2O3
b) V2O5
c) MnO2
d) Ni
View Answer
V2O5.
9. In chemisorption, the forces involved are
a) Van der Waals forces
b) Electrostatic
c) Covalent or ionic
d) Hydrogen bonds
View Answer
Covalent or ionic.
10. The phenomenon where electrolyte ions are depleted from the liquid-air interface is called
a) Positive adsorption
b) Negative adsorption
c) Surface saturation
d) Interfacial tension
View Answer
Negative adsorption.
11. Which of the following forms a colorless ion in aqueous solution?
a) Fe2+
b) Ni2+
c) Zn2+
d) Cu2+
View Answer
Zn2+.
12. The process used to concentrate sulphide ores is
a) Electrolysis
b) Froth flotation
c) Leaching
d) Roasting
View Answer
Froth flotation.
13. Which of the following is a d-block element?
a) Sodium
b) Sulphur
c) Zinc
d) Calcium
View Answer
Zinc.
14. Which element is present in vitamin B12?
a) Magnesium
b) Iron
c) Cobalt
d) Calcium
View Answer
Cobalt.
15. The oxidation number of chlorine in bleaching powder is
a) 0
b) +1
c) –1
d) both b) and c)
View Answer
both b) and c).
16. Which one of the following is an example of a coordination compound?
a) NaCl
b) K3[Fe(CN)6]
c) MgSO4
d) CaCO3
View Answer
K3[Fe(CN)6]
17. The general formula for alkyl halides is
a) CnH2n+2
b) CnH2n+1X
c) CnH2n
d) CnH2n-2
View Answer
CnH2n+1X.
18. The test used to detect the presence of phenol is
a) Iodoform test
b) Tollen’s test
c) Bromine water test
d) Fehling’s test
View Answer
Bromine water test.
19. Which of the following compounds does NOT react with NaOH?
a) Ethanol
b) Acetic acid
c) Phenol
d) Aniline
View Answer
Ethanol.
20. The functional group present in carboxylic acids is
a) –CHO
b) –COOH
c) –OH
d) –CO–
View Answer
–COOH.
21. An amine group is represented as
a) –NH2
b) –NO2
c) –ONO
d) –COOH
View Answer
–NH2.
22. The building blocks of proteins are
a) Nucleotides
b) Amino acids
c) Fatty acids
d) Monosaccharides
View Answer
Amino acids.
23. Which of the following is a condensation polymer?
a) Polyethylene
b) Teflon
c) Bakelite
d) PVC
View Answer
Bakelite.
24. Which compound is used as an antacid?
a) NaCl
b) NaOH
c) Mg(OH)2
d) KCl
View Answer
Mg(OH)2.
25. The phenomenon where the concentration of a solution changes with height in a centrifuge tube due to rotation is known as
a) Osmosis
b) Sedimentation
c) Ultrafiltration
d) Diffusion
View Answer
Sedimentation.
26. Which one of the following is used for softening hard water?
a) Alum
b) Baking soda
c) Washing soda
d) Vinegar
View Answer
Washing soda.
27. The main constituent of photochemical smog is
a) Ozone
b) Carbon monoxide
c) Methane
d) Lead
View Answer
Ozone.
28. Which of the following vitamins is a fat soluble vitamin?
a) Vitamin C
b) Vitamin B12
c) Vitamin D
d) Vitamin B6
View Answer
Vitamin D.
29. Which of the following is not an aromatic compound?
a) Benzene
b) Toluene
c) Cyclohexane
d) Phenol
View Answer
Cyclohexane.
30. The secondary structure of proteins is mainly stabilized by
a) Ionic bonds
b) Disulfide bonds
c) Hydrogen bonds
d) Metallic bonds
View Answer
Hydrogen bonds.