Why oxygen is called gas?
Answer: In the periodic table, oxygen belongs to the chalcogen group. It is a necessary component in the majority of... View Article
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Write down the names of composite radicals
An atom or an ion or a molecule that has a free valence electron that is unpaired is termed as... View Article
Give reasons for the following. a) Aluminium foils are used to wrap food items. b) Immersion rods for heating liquids are made up of metallic substances. c) Copper cannot displace zinc from its salt solution. d) Sodium and potassium are stored in kerosene.
Answer: (a) Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten... View Article
What is the chemical name of Mn3 (BO3) 2?
Manganese(II) Borate is the chemical name of Mn3(BO3)2.
Write the electronic configuration for calcium.
The number of electrons for the Ca atom is 20. Therefore the Calcium electron configuration will be 1s22s22p63s23p64s2. The first... View Article
Does chalk powder dissolves in water if not why?
Calcium carbonate CaCO3 is the main component in chalk. In water the solubility of calcium carbonate is extremely low therefore... View Article
What are the monomers of dacron?
Dacron is copolymer prepared by condensation of methyl ester of terphthalic acid with ethylene glycol. The monomer of Dacron are:... View Article
Balance the chemical equation CaC2 + H2O → Ca (OH)2 + C2H2
Calcium carbide react with water to produce calcium hydroxide and acetylene. The balanced equation is CaC2 + 2H2O → Ca(OH)2+C2H2... View Article
What do you mean by a precipitation reaction? Explain by giving examples.
Answer: A precipitation reaction is a chemical reaction occurring in an aqueous solution where two ionic bonds combine, resulting in the formation... View Article
Calculate the oxidation number of sulphur in Na2S4O6.
Let the oxidation state of sulphur is x. 2 + 4x – 12 = 0 4x = +10 x =... View Article
Which metal is used in the making of microchips?
Silicon is the element used in making microchips.Silicon being the insulator when combined with oxygen (Silicon Oxide) serves the purpose.Microprocessors... View Article
How will u convert ethane into butane?
Wurtz reaction is the reaction in which the form of coupling reaction where two lower alkyl halides are reacted in... View Article
Calculate the formula unit mass of ZnO, Na2O and K2CO3. Give atomic mass of Zn = 65u Na = 23u K = 39u C = 12u O = 16u.
Answer: Formula unit mass is defined as the sum of the atomic masses of all atoms that are present in... View Article
Write some advantages and disadvantages of detergents
Soaps are sodium or potassium salts of higher fatty acids. Fatty acids are carboxylic acids containing 12 or more carbon... View Article
How many atoms are contained in one mole of sucrose?
Answer: Sucrose is the sugar which is known as table sugar. Sucrose is found in all photosynthetic plants. It is... View Article
A barometer kept in an elevator reads 76 cm when the elevator is accelerating upwards. The most likely pressure inside the elevator (in cm of Hg) is
When the elevator is going upwards with acceleration a then net acceleration will be the sum of a and g(acceleration... View Article
How is fog different from smoke?
Smoke is a collection of airborne solid particulates dispersed in the gas which is a dispersion medium. Smoke particles are... View Article
Nail polish remover contains? 1. acetone 2. acetic acid 3. petroleum 4. benzene
Acetone is used as the solvent to manufacture plastics and other industrial products. ver contains aceton as a major content.... View Article
Write one similarity between physisorption and chemisorption.
Physisorption is non-specific in nature. It involves Waal interaction between adsorbate and adsorbent. Chemisorption is highly specific in nature as... View Article
Lime water reacts with chlorine to form (a) CaCl2 (b) CaOCl2 (c) Ca(ClO3)2 (d) CaO2Cl2
Answer: (b) CaOCl2 Calcium hydroxide, also known as slaked lime with the chemical formula Ca(OH)2 is a source of hydroxide ions... View Article
