Explanation: Carbon has atomic number 6, meaning it has 6 protons in its nucleus.
A Neutron
B Proton
C Electron
D Alpha particle
Explanation: A neutron is a neutral subatomic particle found in the nucleus with no electric charge.
A Ionic bond
B Covalent bond
C Metallic bond
D Hydrogen bond
Explanation: NaCl is formed by the transfer of an electron from Na to Cl, creating an ionic bond.
A Hydrogen
B Oxygen
C Chlorine
D Carbon dioxide
Explanation: Zinc displaces hydrogen from HCl, producing zinc chloride and hydrogen gas.
Explanation: Carbon in methane forms four equivalent sigma bonds using sp3 hybridization.
A 6.022 x 10^23 particles per mole
B 6.022 x 10^22 particles per mole
C 3.011 x 10^23 particles per mole
D 1.602 x 10^-19 C
Explanation: Avogadro\'s number is 6.022 x 10^23, representing the number of particles in one mole.
A Law of conservation of mass
B Law of definite proportions
C Law of multiple proportions
D Gay-Lussac\'s law
Explanation: The law of conservation of mass states that total mass remains constant during a chemical reaction.
A -CHO
B -OH
C -COOH
D -CO-
Explanation: Aldehydes contain the -CHO (formyl) functional group bonded to at least one hydrogen.
A Fluorine
B Sodium
C Silicon
D Sulfur
Explanation: Fluorine is the most electronegative element on the Pauling scale with a value of 3.98.
A CH2O
B C2H4O2
C C3H6O3
D C6H12O6
Explanation: Dividing all subscripts in C6H12O6 by the greatest common divisor 6 gives CH2O.
A Red
B Blue
C Green
D Yellow
Explanation: Litmus paper turns red in acidic solutions due to the presence of excess H+ ions.
A Al2O3
B Na2O
C SO3
D CaO
Explanation: Al2O3 reacts with both acids and bases, which is the defining property of an amphoteric oxide.
A Aluminium
B Iron
C Copper
D Zinc
Explanation: Aluminium is extracted from molten alumina by electrolysis in the Hall-Heroult process.
A Starch
B Glucose
C Fructose
D Sucrose
Explanation: Starch is a polysaccharide composed of long chains of glucose units linked by glycosidic bonds.
A Dissolution of ammonium nitrate in water
B Burning of natural gas
C Neutralization of acid and base
D Condensation of steam
Explanation: Dissolving ammonium nitrate in water absorbs heat from surroundings, making it endothermic.
A Pascal
B Bar
C Atmosphere
D Torr
Explanation: The Pascal (Pa) is the SI unit of pressure, equal to one newton per square meter.
A But-2-ene
B Ethene
C But-1-ene
D Ethyne
Explanation: But-2-ene exhibits cis-trans isomerism because each carbon of the double bond has different substituents.
Explanation: Nitrous oxide (N2O) is called laughing gas because it produces euphoria when inhaled.
A CO2 and water
B CO and water
C CO2 and hydrogen
D CO and hydrogen
Explanation: Complete combustion of any hydrocarbon in excess oxygen always yields CO2 and H2O.
A Propan-1-ol
B Propan-2-ol
C Butan-2-ol
D 2-Methylpropan-2-ol
Explanation: In propan-1-ol the hydroxyl group is attached to a carbon bonded to only one other carbon atom.