General Awareness - Basic Chemistry - General Chemistry - Applied Chemistry Notes for All Competitive Exams - Part III
- The hardness of diamond is due to its tetrahedral structure.
- The catalyst in rusting of Iron is moisture.
- Air and water must be present if iron is to rust.
- Pure alcohol can be easily obtained from wine by the process of distillation.
- Amphoteric substances are those which react both with acids and bases.
- The boiling point of water is unaffected by the temperature of heat source.
- The metal which is least affected by the exposure to the atmosphere is tin.
- Ozone attacks mercury and silver.
- Strongest hydrogen bonding is shown by Hydrogen Fluoride (HF)
- Mercury is generally used as a thermometric fluid rather than water because it greater visibility than that of water.
- Common salt obtained from sea.
- Addition of water molecules to a chemical compound is called hydrolysis.
- An atom has no net electric change
- Noble metals do not corrode or tarnish in air or water.
- A substance which conducts electricity when molten or solution but not in the solid state is called an electrotype.
- The water content in the atmosphere becomes more as temperature increases.
- Amino acids are formed from α-keto acids.
- Atomic Number is the number of protons on the nucleus of an atom.
- Cooking oil can be converted into vegetable ghee by process of hydro generation.
- When silver is exposed to the atmosphere, a thin layer of silver sulphide appears on the surface.
- An ideal gas cannot be liquefied as its critical temperature is always above 0oC.
- Fluorescent powder is used for developing finger prints on a multi coloured surface.
- Pure water is obtained from the sea water by evaporation.
- The acid that can be used as a hypnotic is barbituric acid.
- Neutralization of an acid by a base is an example of double decomposition.
- A moderator regulates the number of nuclei split by the impact of neutrons.
- The solution of sodium chloride is neutral.
- Ammonium nitrate is a powerful destructive agent.
- Cesium is used for time-keeping in an atomic clock.
- Colour of solid iodine is steel grey.
- IA to VII A groups of elements are known as normal elements.
- The element which is used as a semiconductor in transistors is germination.
- Acid rain is caused by the pollution of Environment due to Nitrogen oxide and sulphur dioxide.
- Chlorination means the addition of a small quantity of chlorine in water as a germicide.
- Rising of dough in the process of manufacture of bread is through the action of CO2,
- The elements of group to VII B and VII are called the transition elements.
- Coloured glasses for goggles contain ferrous oxide.
- The industrial preparation of metal aluminium from Bauxite involves the process of electrolysis.
- Sachharinderer is an instrument to determine the pressure of the gas.
- In case of a chemical change - electron is generally affected.
- To make rubber strong and bounceable we add Sulphur.
- The smallest possible unit of chemical compound is molecule.
- Synthetic detergents are a mixture-of sodium salts of aromatic and aliphatic sulphuric acids.
- An alloy which melts at the lower temperatures is solder.
- Diamond is very hard, while graphite is very soft.
- Plutonium can be directly used for nuclear explosion and hence very important
- Water gas is the Mixture of CO and H2
- Aniline is used in dyes and medicines.
- When the solute is mixed in solvent its boiling point increases.
- Duralium contains 95% aluminium.
- The enormous energy released in an atomic explosion is due to the conversion of mass into energy.
- When some impurity is added to the solvent, its boiling point increases with the amount of impurity.
- The internal energy of an ideal gas depends only on its temperature.
- Low ionization energy is characteristic feature of a metal.
- The temporary hardness of water is due to the presence of the bicarbonates of Ca and Mg.
- To make artificial rain silver iodide is needed.
- Peal ash is potassium carbonate.
- At absolute zero temperature the total kinetic energy of the molecules is zero.
- The solubility of solids increases with increase in temperature.
- Baking powder contains sodium bicarbonates and tartaric acid.
- In the process of electroplating electric energy is converted into heat energy or magnetic energy or chemical energy.
- Fog is a colloidal solution of gas and liquid.
- Lead pencil is graphite.
- Heavy Water (D2O) is called heavy because it is an oxide of deuterium.
- Size of the nucleus is 10-12 meter.
- The space between nuclei and electrons in an atom is vacant.
- Gaseous fuels are preferred in Industries.
- Sulphuric acid is produced by the lead chamber process.
- Carbon-dating is used to determine the gas of fossils.
- Argental (Ag2S) is an alloy of Silver.
- More than one neutron is released in the process is used for dry-cleaning of clothes.
- X-rays are produced when very high energy electrons are stopped suddenly at a metal target.
- The fundamental units of radioactivity are Curie and Becquerel
- The amount of humidity present in air divided by the maximum humidity that air can processes is known as relative humidity.
- In general glasses are bad conductor of electricity.
- Bleaching powder is a light yellow powder which reacts with oil acids to release Cl2 and acts as an oxidizing.
- Gold is the most ductile of all the metals.
- Chlorine gas bleaches the flowers.
- The resistance of a Semi-conductor decreases within increase of temperature.
- Ammonia is produced by the Haber's process.
- Ethanol is also called 'grain alcohol'.
- Green vitriol is FeS04 7H2O
- Detergent's action of soap is due to decrease in surface tension of water.
- There is no effect of temperature pressure etc. on radioactivity.
- Malachite is the mineral of copper.
- The isotope of Uranium which is very much radioactive is U-235.
- The resistance of Mercury becomes zero at 4k.
- Large energy release in an atomic bomb explosion is mainly due to the product having a lesser mass than initial substance.
- Ethyl alcohol is used as a Sedative i.e. Soothing medicine.
- White phosphorus is a strong poison.
- Y-rays are produced by nuclear changes in the atom.
- Alcohol is used for during cleaning of clothes.
- The age of an artifact is determined using the technique based on radio carbon dating and chemical kinetics.
- Rust is hydrated ferric oxide
- For welding the gas is used acetylene.
- The Lightest particle is electron 0 β particle.
- Water is not applicable to extinguish oil fire and electrical fire.
- Density of water is Maximum at 4°C.
- Electroscope is used to detect the presence of charge on a body.
- Filament of electric bulbs are made up of Tungsten.
- Fast Breeding Reactor is a nuclear reactor to produce electricity though fusion process.
- Electric bulbs are filled with Argon gas.
- Mercury (Liquid) is the good conductor of heat.
- Pure gold is softer than steel.
- Water boils below 100°C at higher altitudes because the atmospheric pressure is low there.
- U-238 ultimately decays to a stable isotope i.e. Lead- 206.
- The fissionable isotope of Uranium and therefore, important for nuclear reactors is U-235.
- Solder alloy melts at the lowest temperature.
- Bio-energy is a renewable source of energy.
- Graphite is crystalline allotropes of carbon. Which a good conductor of electricity and can produced artificially.
- Pressure law verifies relation between pressure and temperature content volume.
- Gobar gas main constituent methane.
- Nitrogen fixation means conversion of atmospheric nitrogen into useful compounds.
- A breeder nuclear reactor produces more fissionable material than it consumes.
- X-ray was invented by W.E. Roentgen 1895 (Germany)
- The Chemical name of packing soda is sodium bicarbonate (NaHCO2).
- Crude petroleum is converted into petrol through a process called fractional distillation.
- The Mixture of sand arid iodine can be separated by sublimation.
- Click For Part 1 | Part II | Part IV
hi
ReplyDeletePost a Comment