Explain the nature of the covalent bond using the bond formation in CH3Cl
Answer: Chloroform is an organic chemical compound initially employed as an ideal anaesthetic. It is a colourless, sweet-smelling dense liquid produced... View Article
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While cooking, if the bottom of the vessel is getting blackened on the outside, it means that (a) the food is not cooked completely. (b) the fuel is not burning completely. (c) the fuel is wet. (d) the fuel is burning completely.
Answer: (b) the fuel is not burning completely. If the bottom of the vessel becomes blackened on the outside when... View Article
Butanone is a four-carbon compound with the functional group (a) carboxylic acid (b) aldehyde (c) ketone (d) alcohol
Answer: (c) ketone Ketone In ketones, the carbonyl group has 2 hydrocarbon groups attached to it. These can be either... View Article
Ethane, with the molecular formula C2H6 has (a) 6 covalent bonds. (b) 7 covalent bonds. (c) 8 covalent bonds. (d) 9 covalent bonds
Answer: (b) 7 covalent bonds Ethane (C2H6) Ethane is a saturated hydrocarbon in gaseous form. Ethane is the second most... View Article
People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
Answer: Soap reduces water’s surface tension. The soap’s long chain non-ionic hydrocarbon group binds to oil or grease droplets, softening... View Article
Would you be able to check if water is hard by using a detergent?
Answer: The water with naturally present minerals like magnesium and calcium with detectable amount is called hard water. These minerals... View Article
What are oxidising agents?
Answer: An oxidizing agent (oxidizer or oxidant) is a chemical species that tends to oxidize other substances, i.e. cause an... View Article
How would you distinguish experimentally between an alcohol and a carboxylic acid?
Answer: Carboxylic acids emit carbon dioxide gas when they react with Sodium Carbonate, turning lime water milky, whereas alcohols do... View Article
A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
Answer: Since the production of heat is very necessary for welding metals, a mixture of oxygen and ethyne is burned... View Article
Why is the conversion of ethanol to ethanoic acid an oxidation reaction?
Answer: It is an oxidation reaction as ethanol is converted to ethanoic acid since the hydrogen atom is removed and... View Article
Draw the structures for the following compounds. (i) Ethanoic acid (ii) Bromopentane (iii) Butanone (iv) Hexanal
Answer: The covalently bonded carbon-containing compounds called organic compounds are substantial for life on earth. The specific branch of science... View Article
What will be the formula and electron dot structure of cyclopentane?
Answer: Electron dot structures or Lewis dot formula can be drawn if the molecular formula of the compound is known.... View Article
What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
Answer: Carbon forms a range of substances with a number of other elements; these compounds are known as carbon compounds.... View Article
What would be the electron dot structure of a molecule of Sulphur which is made up of eight atoms of Sulphur? (Hint – The eight atoms of Sulphur are joined together in the form of a ring).
Answer: Sulphur has an atomic number of 16 and an electronic configuration of 2,8,6. The valance electrons on the sulphur... View Article
State whether the following statements are true or false. (a) An electric motor converts mechanical energy into electrical energy. (b) An electric generator works on the principle of electromagnetic induction. (c) The field at the center of a long circular coil carrying current will be parallel straight lines. (d) A wire with a green insulation is usually the live wire of an electric supply.
Answer: (1) False An electric motor converts electrical energy into mechanical energy. Electric motor An electric motor is a device... View Article
At the time of short circuit, the current in the circuit (1) reduces substantially. (2) does not change. (3) increases heavily. (4) vary continuously.
Answer: (3) Increases heavily A short circuit occurs when the current in the circuit rises rapidly and the electrical connection... View Article
Which sources produce alternating current?
Answer: Alternating current is an electric current that periodically reverses direction in contrast to DC which flows in only one... View Article
Draw magnetic field lines around a bar magnet.
Answer: Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of... View Article
Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.
Answer: Mendeleev’s periodic table is an arrangement of elements in an increasing atomic mass order in a tablet form, such... View Article
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
Answer: Calcium has an atomic number of 20, and thus has an electronic configuration, Ca (Z = 20) = 1s2... View Article
