Related InterviewSolutions

• The equation Na + H2O → NaOH + H2 is ………(a) correct (b) incorrect since it is not balanced (c) incorrect since hydrogen should be written as H and not H2(d) None
• Define the term ions or radicals.
• Write a note on valency with respect to – 1. Chlorine 2. Oxygen
• State the Law of Constant Proportions.
• Write ‘true’ or ‘false’ for the following statements:1. Elements combine in definite proportions to form compounds.2. Elements having a tendency to accept electrons are called metals.3. Electrons are present in the nucleus.4. Neils Bohr gave the theory to explain the arrangement of protons in an atom.5. Cathode rays are a stream of fast moving particles that travel in random directions.6. Uranium-235 and uranium-238 both undergo nuclear fission.7. After the emission of a beta-particle, the atomic number of the atom increases by one.
• The nucleus is the central dense core of the atom consisting of neutrons and protons.
• An atom differs from its ion in ………(a) nuclear charge (b) mass number(c) number of electrons (d) number of protons
• State the Law of Conservation of Mass.
• The valency of which of the element is zero.(a) iron (b) hydrogen (c) helium (d) oxygen
• An atom is electrically neutral. Give reason.