Education with Purpose
Chemistry : One Liner for all competitive Exam 2025. Compiled from different websites for consolidated last-minute revision for all Competitive examinations
Chemistry – Set II
- Why are sodium and potassium kept in kerosene oil – Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
- Which Metal is the Best Conductor of Electricity – Silver
- The property of metals by which they can be beaten into thin sheets is called –Malleability
- The ability of metals to be drawn into thin wires is called – Ductility.
- Which is the most ductile metal known – Gold
- Which chemical is known as king of chemicals – Sulfuric acid
- The atmosphere of Venus is made up of thick white and yellowish clouds of –Sulphuric acid
- Petrol and diesel are obtained from a natural resource called – Petroleum.
- Graphite is a good conductor of heat and electricity because it has – Free electrons
- Electrons present in the outermost shell of an atom are known as –Valence electrons
- Invar is an alloy of – Iron and Nickel
- Sterling silver is an alloy of – Silver and copper
- Gun metal is an alloy of – Copper ,tin and zinc
- Farmers neutralise the effect of acidity of the soil by adding – slaked lime
- Lime water reacts with chlorine to give – CaOCl2(Bleaching powder)
- The process of reduction involves – Addition of hydrogen
- Oxidation is a process which involves – Addition of oxygen
- Formula of Nitrous oxide –N2O
- Formula of Nitrogen dioxide – NO2
- An organic compound containing − COOH functional group is called –Carboxylic acid
- –CHO represents the functional group – Aldehydes
- An organic compound containing −OH functional group is called – Alcohol
- Which elements are considered the metalloids – Boron (B), Silicon (Si), Germanium (Ge),Arsenic (As), Antimony (Sb),Tellurium (Te),Polonium (Po).
- What happens to the electropositive character of elements on moving from left to right in a periodic table – Decreases
- Name of the most reactive element present in group 17 (Halogens) –Fluorine
- Newlands relation is called – Law of Octaves
- The elements of group 16 are called – Chalcogens
- The group 17 elements are also known as – Halogens
- The group 18 elements are also known as – Noble gases
- Which chemical compound is also known as ‘Oil of Vitriol’ – Sulphuric Acid (H2SO4)
- Calcium sulphate dihydrate (CaSO4 .2H2O) is commonly known as – Gypsum
- Calcium oxide (Cao) is commonly known as – Quick lime
- Calcium hydroxide (Ca(OH)2 ) is commonly known as – Slaked lime
- Trichloro Methane( CHCl3 ) is commonly known as – Chloroform
- Calcium Carbonate (CaCo3) is commonly known as – Chalk
- Calcium sulfate hemihydrate (CaSO4⋅ 1/2H2O) is popularly known as plaster of Paris – Plaster of Paris
- Name the acid present in Orange – Citric acid
- Name the acid present in Tamarind – Tartaric acid
- Name the acid present in Tomato – Oxalic acid
- Name the acid present in Apple – Malic acid
- Metals are found on the – Left-hand side of the Periodic Table.
- Non-metals are found on the – Right-hand side of the Periodic Table
- How many periods and groups are present in the periodic table – 7 periods and 18 groups
- Which group elements are called transition metals – Group number 3 to 12
- At the time of Mendeleev, the number of elements known was – 63
- The value of Avogadro’s constant is – 6.022 × 1023
- Which radioactive element is used in the treatment of cancer – Cobalt-60
- The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called – Rancidity
- The important ore of aluminium is – Bauxite
- Percentage of lead in lead pencils is – Zero
- An emulsion is a colloid of a – Liquid in a liquid
- Vulcanization of rubber is carried out by adding – Sulphur
- Which gas is used as fire extinguisher – Carbon dioxide
- Water can be separated from alcohol water mixture by – Distillation
- Petroleum is a mixture of – hydrocarbons
- Curd is sour due to presence of – Lactic acid
- Milk is a natural – Emulsion
- Impure camphor is purified by —– sublimation
- Which is the most abundant metal in the Earth’s crust – Aluminium
- Solder is an alloy of – Tin, lead
- Liquified Petroleum gas (LPG) is a mixture of – Butane and Propane
- The earthy impurities like sand, rocks and limestone present in an ore is called- Gangue.
- Atoms of the elements having same atomic number, but different mass numbers are known as – Isotopes
- A reaction in which oxidation and reduction takes place simultaneously is – Redox Reaction
- What is the name of the reaction in which acid reacts with base to form salt and water – Neutralisation reaction
- What is “milk of magnesia” chemically – Magnesium hydroxide
- Silk fibre chemically is – Protein
- Process of gaining electrons is known as – Reduction
- According to Newlands’ Law of Octaves, how many elements exist in nature – 56
- What is the atomicity of sulphur- Poly-atomic
- Which inert gas mixed with oxygen is given to the patients suffering from restricted breathing? – Helium
- Who is known as “Father of modern chemistry’ – Antotne Lavoisier
- Name the metal that can be easily cut with a knife – Lithium, Sodium, Potassium
- The molecular formula of Propane is – C3H8
- According to Mendeleev’s Periodic Law , the properties of elements are a periodic function of their atomic masses
- Which is the last element in Newlands’ Law of Octaves? – Thorium
- C12 H22 O11 is also known as – Sugar
- What is the chemical name of the Laughing Gas –Nitrous oxide
- Nail polish remover contains – Acetone
- Black lung disease occurs in people working in – coal mine
- Which coal is known as the ‘brown coal’ – Lignite
- What is commonly called limestone is – calcium carbonate (CaCO3)
- Dry ice is – solid carbon dioxide
- The acid used in eyewash is – Boric acid
- Hydrochloric acid is also known as – Muriatic acid
- Water gas is the mixture of – Carbon monoxide & hydrogen
- What is the formula for lime water – Ca(OH)2
- What is the pH level of blood of a normal person –7.35-7.45
- The main source of Naphthalene is – Coal-tar
- Non-stick kitchenware are coated with –Teflon
- The trip of the match-stick contains – red phosphorus
- The non-metal found in the liquid state is – bromine
- Which acid is used to remove ink stain- Oxalic acid
- Metals causes Itai -Itai disease – Cadmium
- The chemical name of ‘Common salt’ is – Sodium chloride
- The chief constituent of natural gas is – Methane
- Chemical formula for Lime water is – Ca (OH)2
- The pH of lemon juice is around – 2
- What are Metalloids – Modern Periodic Table, a zig-zag line separates metals from non-metals. The borderline elements boron, silicon, germanium, arsenic, antimony, tellurium and polonium are intermediate in properties and are called metalloids.
- Which is used in plastics- Ethylene
- Symbol for Methane is – CH4
- What is the freezing point of water on Kelvin scale – 273.15K
- A solution reacts with chalk powder to give a gas that turns lime water milky. The solution contains – HCl
- The ability of metals to be drawn into thin wires is called – Ductility
- Which gas is known as ‘noble gas’ –The elements Helium, Neon, Argon, Krypton, Xenon and Radon of group 18 in the periodic table are called as Noble gases or Rare gases.
- Which acid is present in the ant sting – Methanoic acid (Formic acid)
- Which is a similarity between acids and bases – Process of mixing acid or base with water is exothermic
- Which contains CFC – Refrigerants
- Litmus solution is derived from – Lichen
- Elements in the modern periodic table are arranged in 18 vertical columns
- Which type of coal has the highest percentage of carbon – Anthracite
- Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled _Outermost shell
- Kerosene oil rises up in a wick of lantern because of – Capillarity
- Each element has a name and – A unique chemical symbol
- Which is the process of converting sugar into alcohol – Fermentation
- Lactic acid is a –Three-carbon molecule
- Biogas is an excellent fuel as it contains up to 75% – Methane
- Non-metals are known as electronegative elements because they form negatively charged ions by the gain of electrons.
- The addition of which adds fizz to soft drinks – Carbon dioxide
- Being light and non-inflammable gas is used to blow balloons –Helium
- Which acid is the constituent of eyewash – Boric acid
- Formaldehyde is used in – Perfumes
- Lime water turns milky on passing carbon dioxide gas through it due to the formation of – CaCO3
