Chemistry Section 10

---

• An element with electronic configuration 1s2 2s2 2p2 belongs to Group IV-A.
• Among the given ions, Cl- is stable in aqueous solution.
• Atoms of the same element with the same atomic number but different mass numbers are called isotopes.
• Shielding effect across a period remains constant.
• A higher value of electron affinity means the atom will gain electrons easily.
• The melting points of VII-A group elements increase down the group.
• Mg+2 possesses the maximum hydration energy.
• The true increasing order of acidity of the oxides of Mn is Mn2O7 > MnO2 > MnO.
• Mn has the highest oxidation state in its compounds among the given elements.
• O-2 cannot exist in a solution.
• An element with a low value of ionization energy and low value of electron affinity is likely to belong to Group IA.
• Metallic character always increases on going from top to bottom in a group.
• Among halogens, iodine has the highest boiling point.
• Democritus did not contribute to the construction of the periodic table.
• Germanium was not known when Mendeleev proposed his classification.
• Noble gases are named so because they are less reactive, zero group elements, and have a completely filled valence shell.
• The longest period in the modern periodic table is the 6th period.
• The seventh period contains 2 normal elements.
• The modern periodic table has been divided into 4 blocks.
• Amphoteric oxides possess both acidic and basic properties.
• Hydrogen resembles carbon due to its remarkable reducing properties.
• Nitrogen and phosphorous elements belong to the same group.
• The property of coordination number of ions is not a periodic property.
• The discovery of atomic number by Moseley caused a revision in the periodic law as stated by Mendeleev.
• The property of melting and boiling points increases up to Group IV-A, then decreases onwards.
• Deuterium reacts with oxygen to form heavy water (D2O).
• Ionization energy depends upon nuclear charge, atomic size, shielding effect, and the nature of the orbital.
• Addition of the 2nd electron to a uninegative ion is always endothermic.
• Metallic character of alkali metals increases down the group.
• Oxidation state of an atom represents the apparent charge in a compound.
• Polymeric halides are formed when halogen atoms act as a bridge between two atoms of the other element.
• Iodine is solid due to its high polarizability.
• Ba > Mg in terms of size.
• Palmitic acid has the formula C15H31COOH.
• Glycine is an amino acid without COOH group.
• Formamint is made by combining formaldehyde and lactose.
• Acetic acid is used in making medicine called urotropine.
• The formula of haloform is CHX3.
• The test used to identify amino acids is the ninhydrin test.
• Dry distillation of calcium acetate results in the formation of acetone.
• Carboxylic acid reacts with ammonia to form acidamide.
• Complete reduction of carboxylic acid results in the formation of an alkane.
• Picric acid does not belong to any of the given options.
• There are 10 essential amino acids.
• Propanoic acid is an acid with an unpleasant smell.
• Acetone reacts with HCN to form a cyanohydrin.
• Sodium butyrate is not an ester.
• Octyl acetate is responsible for orange flavor.
• Tyrosine is an amino acid present in cheese.
• Maleic acid is an unsaturated carboxylic acid.
• Malonic acid is known as propane-1,3-dioic acid.
• The irritation caused by red ant bites is due to formic acid.
• Formic acid is the strongest acid among the given options.
• Amino acids with a zwitterion form have both carboxylic and amino groups.
• Hydrogen bonding is a common feature in amino acids.
• Citric acid is responsible for the orange flavor.
• Lysine is an amino acid that is neither acidic nor basic in nature.
• Glycine is named because of its sweet taste.
• Hydrogen resembles carbon due to its remarkable reducing properties.
• Methanol is a compound that reacts with NaHSO3.
• Aldehydes and ketones have the same general formula for the homologous series CnH2nO.
• An irritant smell is characteristic of butyric acid.
• Aldehydes with Fehling’s solution are converted to carboxylic acids.
• Carboxylic acids are stronger acids than phenols.
• Tartaric acid is a dibasic acid.
• Acetic acid does not react with sodium hydrogen carbonate.
• Carboxylic acids have higher boiling points compared to aldehydes and ketones.
• Acetone is a ketone that reacts with Tollen’s reagent.
• Carboxylic acids are named based on the corresponding alkane names.
• Acetophenone does not show a characteristic test with 2,4-DNP reagent.
• Amines are derivatives of ammonia where one or more hydrogen atoms are replaced by alkyl or aryl groups.
• Aliphatic amines have a fishy odor.
• Gabriel phthalimide synthesis is used to prepare primary amines.
• The basicity of aromatic amines is lower than aliphatic amines.
• Aniline does not react with NaNO2 + HCl.
• Tertiary amines do not undergo the Hofmann bromamide reaction.
• Aliphatic amines have higher boiling points compared to aldehydes of similar molecular weights.
• Amides are derivatives of carboxylic acids.
• Benzamide is an example of an aromatic amide.
• Amides can participate in hydrogen bonding.
• The IUPAC name of acetanilide is N-phenylethanamide.
• Amides do not react with NaOH.
• Amides are less basic compared to amines.
• Aldehydes and ketones have a carbonyl group.
• Aldehydes and ketones are both present in fructose.
• Acetone does not show a characteristic test with Fehling’s solution.
• The reaction of aldehydes and ketones with 2,4-DNP reagent produces colored precipitates.
• Aldehydes and ketones do not undergo aldol condensation.
• Aldehydes are generally more reactive than ketones.
• Ketones are less prone to oxidation compared to aldehydes.
• Tollens’ reagent is used to distinguish aldehydes from ketones.
• Aldehydes and ketones do not react with sodium carbonate.
• Acetone is a ketone that does not undergo oxidation by Fehling’s solution.
• Aldehydes and ketones do not form hydrogen bonds with water.
• Aldol condensation involves the formation of a carbon-carbon bond.
• Acetone does not react with hydroxylamine hydrochloride.
• Aldehydes and ketones do not react with sodium hydrogen carbonate to produce effervescence.
• Acetophenone is an aromatic ketone.
• Aldehydes and ketones are both present in glucose.
• The reaction of aldehydes and ketones with 2,4-DNP reagent forms orange/red precipitates.