What happens when zinc reacts with water?
Zinc does not react directly with water. It depends on the temperature of both, the zinc metal and the water.... View Article
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What is the difference between precipitation and condensation?
Condensation is the change of physical state of matter from a gaseous phase into a liquid phase while precipitation is... View Article
Calculate the oxidation number of sulphur, chromium and nitrogen in H2SO5, Cr2O7 (2-) and NO3 (-) .
H2SO4 by conventional method. Let x be the oxidation number of S 2(+1) + x + 5 (−2) = 0... View Article
Give two examples of thermoplastics and thermosetting plastics.
Thermoplastics: These are the plastics that can be deformed easily on heating and can bend also. Polyethylene, polypropylene, polyvinyl chloride... View Article
Who is the first member of ketone series?
The first member of Ketones is (IUPAC name) 2 – propanone. H3C – CO – CH3. This is also called... View Article
How SO2 is air pollutant?
Sulphur dioxide (SO2) is an air pollutant made up of sulphur and oxygen atoms and is harmful to both plants... View Article
How to convert benzoic acid to benzaldehyde?
When benzoic acid is treated with thionyl chloride (SOCl2) it changes into benzoyl chloride which is followed by Rosenmund’s reduction,... View Article
Leachate is a coloured liquid that comes out of (A) Compost (B) Aerated lagoon (C) Septic tanks (D) Sanitary landfills
Leachate is a liquid which is harmful substances dissolved in it and may affect our environment. It is a liquid... View Article
Cheese is a colloidal solution of ___________.a) Solid in solid b) Liquid in solid c) Solid in liquid d) Gas in solid
The solution in which the solute particles are suspended in a liquid (fluid) is called colloidal solution. Colloid is a... View Article
What is the IUPAC name of CH3COOC2H5?
The following compound is ester R−COO−R ′ and the naming of ester are done on the basis of alkanoate group... View Article
Which of the following is a liquid form of aerosol? (1) Fume (2) Dust (3) Mist (4) Smoke
Answer: (3) Mist An aerosol is a colloid of fine solid particles or liquid droplets, in the air or another gas. Aerosols can be natural... View Article
Define a parallactic second
Parallactic second is a unit of distance in astronomy. It is used to measure the astronomical large distances to objects... View Article
Define ignition temperature.
The ignition temperature of a substance is the minimum temperature at which the substance catches fire for spontaneous combustion. The... View Article
Number of valence electrons in Chlorine ion are: (a) 16 (b) 8 (c) 17 (d) 18
Answer: (b) 8 Valence electrons are defined as electrons in the outer shells that are not filled are called valence... View Article
Internal energy is a state function. Explain.
Property of the system which depends upon only state of the system and not on the path by which achieved... View Article
Which set of elements shows positive electron gain enthalpy? (1) He, N, O (2) Ne, N, CI (3) O, CIF (4) N, He, Ne
A positive electron gain enthalpy is defined as the energy required to enter an electron into an atom. The elements... View Article
What is the mass of electron in gram?
An electron is a tiny particle with a mass of 9.108 × 10−28 g and a negative charge. All neutral... View Article
Explain the formation of ammonia molecule.
Ammonia is formed from 3 atoms of Hydrogen and 1 atom of Nitrogen. Atomic number of N = 7 Electronic... View Article
Hydrogen will not reduce. (A) Cuo (B) Fe3O4 (ferric oxide) (C) SnO2 (D) Al2O3
Hydrogen can only reduce those substances which are below it in the oxidizing table. Copper, tin and iron lies below... View Article
Write name and the structure of the monomer of polythene
Polythene is an addition polymer of ethene. Monomer of polythene is ethylene ( H 2 C = C H 2... View Article
