Chemistry Practice Questions

Chemical Properties and Reactions

• The rectified spirit is 95% alcohol.
• Metallic crystals are soluble in polar solvent.
• Paramagnetic behavior of a substance is measured by a Guoy's balance.
• Cathode rays are material in nature and cast shadows, possess momentum, and are negatively charged.
• de Broglie wavelength of an electron is 0.33 nm when moving with a velocity of 2.188 x 10^6 ms^-1 in the first orbit of Bohr's model of hydrogen.

Atomic Structure and Periodic Table

• Atomic number of Mn is 25, and its electronic configuration in the ground state is 1s2 2s2 2p6 3s2 3p6 4s23d5.
• Hunds rule states that electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled, then they go into sub-shells with anti-parallel spin.
• The electronic configuration of Mn is consistent with Hunds rule.

Chemical Bonding and Molecular Structure

• Butyl chloride has 4 possible isomers.
• The VSEPR theory is superior to others.
• A catalyst changes the direction of reaction in a reversible reaction.
• pH of a solution is related to its H+ ion concentration, with a pH of 0 corresponding to a concentration of 1.

Chemical Reactions and Stoichiometry

• The balanced chemical equation for the reaction of Be with water is Be + 2H2O → Be(OH)2 + H2.
• The reduction of the solution occurs at the Ag electrode in an Al-Ag cell.
• Energy of reactant is greater than energy of product in an endothermic reaction.
• Ag can be displaced by all other metals from its solution.

Organic Chemistry

• The process of fermentation involves all the enzymes except Diastase.
• Regular coiling or zigzagging of polypeptide through hydrogen bonding is its secondary structure.
• Propane-1,3-dioic acid is also known as Malonic acid.
• Industrial materials thermal power stations are coated with epoxy paints.
• Hydrocarbons that burn with smoky flame are called aromatic.
• Octane number of 2,2,4-trimethyl pentane is 100.
• Geometric isomerism is usually found in alkenes.
• Organic compounds that are essentially non-polar and exhibit weak intermolecular forces have low melting points.

Analytical Techniques

• The technique used to separate components of a mixture in solid phase is crystallization.
• Identification of the components of a sample is qualitative analysis.
• Different components of a mixture have different Rf values due to their different distribution coefficients in the solvent.
• Silica gel and alumina are used as stationary phase.
• Sintered glass is a porous material used for filtration.
• The major steps involved in complete quantitative analysis are 4.

Physical Chemistry

• On sp3 hybridization, one s and 3 p-orbitals are involved.
• The relative rate of effusion of CO and CO2 is CO being 1.25 times faster than CO2.
• Ideal gases have all the following characteristics except the absence of intermolecular forces.
• Gases deviate from ideal behavior at high pressure and low temperature.
• The introduction of the Kelvin scale in thermodynamics is according to Charles' law.
• At constant temperature, the pressure of an ideal gas is doubled, its density becomes double.
• Critical temperature for different gases is different and depends upon intermolecular attractions.
• The simplest form of matter is a gas.
• Solid particles only possess vibrational motion.