Explanation: An alpha particle consists of 2 protons and 2 neutrons (identical to a He2+ nucleus), giving it a charge of +2.
A Oxygen
B Chlorine
C Hydrogen
D CO2
Explanation: Zn + 2HCl -> ZnCl2 + H2. Zinc reacts with dilute hydrochloric acid to produce zinc chloride and hydrogen gas.
Explanation: Fe3+ has configuration [Ar] 3d5. All five 3d orbitals have one unpaired electron each (Hund\'s rule), giving 5 unpaired electrons.
A Iron catalyst
B Platinum catalyst
C Vanadium pentoxide (V2O5)
D Nickel catalyst
Explanation: V2O5 is the catalyst used in the contact process to oxidize SO2 to SO3, a key step in manufacturing H2SO4.
A Linear
B Trigonal planar
C Trigonal pyramidal
D Tetrahedral
Explanation: NH3 has sp3 hybridization with 3 bonding pairs and 1 lone pair. The lone pair pushes the bonds down, giving trigonal pyramidal geometry.
A Ksp = [Ag+][Cl-]^2
B Ksp = [Ag+][Cl-]
C Ksp = [Ag+]^2[Cl-]
D Ksp = [Ag+]/[Cl-]
Explanation: For AgCl(s) <=> Ag+(aq) + Cl-(aq), the solubility product is Ksp = [Ag+][Cl-].
A -COOH
B -CHO
C -CO-
D -OH
Explanation: The aldehyde functional group is -CHO (formyl group), where a carbonyl carbon is bonded to at least one hydrogen atom.
A Shifts to the left
B Shifts to the right
C No change
D Catalyst is needed
Explanation: The forward reaction reduces the number of gas moles (4 -> 2). By Le Chatelier\'s principle, increased pressure shifts equilibrium toward fewer moles (right).
A Salt solution
B Milk
C Sugar solution
D Air
Explanation: Milk is a colloid where fat and protein particles are dispersed in water, exhibiting the Tyndall effect and other colloidal properties.
Explanation: C3H8O has three isomers: 1-propanol, 2-propanol (both alcohols), and methoxyethane (an ether).
A Pink
B Colorless
C Red
D Blue
Explanation: Phenolphthalein is colorless in acidic solutions (pH < 8.2) and turns pink in basic solutions (pH > 10).
A Ice
B Table salt
C Diamond
D Iron
Explanation: Diamond is a network covalent solid where each carbon atom is tetrahedrally bonded to four other carbons through strong covalent bonds throughout the crystal.
A CnH2n
B CnH2n+2
C CnH2n-2
D CnHn
Explanation: Alkanes are saturated hydrocarbons with only single bonds. Their general formula is CnH2n+2, reflecting the maximum number of hydrogen atoms.
A Acidic oxide
B Basic oxide
C Amphoteric oxide
D Neutral oxide
Explanation: SiO2 is an acidic oxide. It reacts with strong bases (like NaOH) to form silicates but does not react with acids (except HF).
Explanation: NH4+ has 4 bonding pairs and 0 lone pairs on nitrogen, giving sp3 hybridization with tetrahedral geometry.
A Na > Mg > Al > Si > P > S > Cl
B Na < Mg < Al < Si < P < S < Cl
C Cl > S > P > Si > Al > Mg > Na
D Na = Mg = Al = Si = P = S = Cl
Explanation: Atomic size decreases across a period from left to right due to increasing effective nuclear charge pulling electrons closer to the nucleus.
A 74 g/mol
B 37 g/mol
C 24.7 g/mol
D 148 g/mol
Explanation: Ca(OH)2 has n-factor = 2 (two OH- groups). Equivalent weight = 74 / 2 = 37 g/mol.
Explanation: Al(OH)3 is amphoteric: it reacts with both acids (forming Al3+ salts) and bases (forming aluminate ions).
A Ethanal
B Ethene
C Diethyl ether
D Ethyl hydrogen sulfate
Explanation: At 443 K (high temperature), ethanol undergoes dehydration to form ethene (CH2=CH2) and water via elimination of OH and H from adjacent carbons.
Explanation: FCC has 8 corner atoms (8 x 1/8 = 1) + 6 face atoms (6 x 1/2 = 3) = 4 atoms per unit cell.