Balbharati Class 8 General Science Solutions Metals and Nonmetals
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of Balbharati Class 8 General Science Book Chapter 7, Metals and Nonmetals. Here students can easily find step by step solutions of all the questions in Metals and Nonmetals. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 7 solutions. Here all the Question Answer are based on Balbharati latest syllabus. Here all the question and answer are based on Maharashtra State Board latest syllabus.
Metals and Nonmetals Exercise question Solutions :
Question no – (1)
(i) Ductility → used to form copper wires
(ii) Malleability → used to form sheets of metals ex – silver foil.
(iii) Conduction of heat → used to cook food.
(iv) Conduction of electricity → used to power appliances.
(v) Sonority → used to produce sound in school bells.
Question no – (2)
(a) Here the odd one is – Diamond
Because, apart from diamond all other are metals.
(b) Here the odd one is Brittleness.
Because, apart from brittleness all other are properties of metals.
(c) Here the odd one is – Bromine
Because, apart from bromine all other are liquid non metals.
(d) Here the odd one is – Iron.
Because, apart from iron all other are alloys.
Question no – (3)
(a) The stainless steel vessels in kitchen have copper coatings on the bottom because copper is a good conductor of heat so the food will be cooked well and evenly.
(b) Copper and Brass vessels are cleaned with lemon because lemon has a property to make metals like copper and brass look more lustrous.
(c) Sodium is kept in kerosene because sodium often reacts with water to form it’s hydroxides and hydrogen.
Question no – (4)
(a) To prevent metals from corroding layers of oil, grease, varnish or paint can be applied and sometimes the metal is plated with layer of another non corroding metal.
(b) The metals that make the bronze alloy are copper and tin and the metals that make the brass alloy are copper and zinc.
(c) The adverse affects of corrosion are that it makes the metals week or change it’s color and a layer of deposits forms around the metal.
(d) The nobles metals are used to,
- To prepare ornaments.
- To prepare medicines.
- To make medals.
- To make electronic devices.
- To use as a catalyst.
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