Attempt all questions :--- (1×5=5)
1. M is an element in the form of a powder .M burns in oxygen and product obtained is soluble in water .The solution is tested with litmus.Write down only the word which will correctly complete each of the following sentences.
(a) If M is a metal, then the litmus will turn _________ .
(b) If M is a non metal , then the litmus will turn _______ .
(c) If M is a reactive metal , then _______ will be evolved when M reacts with dilute sulphuric acid .
(d) If M is a metal ,it will form ______ oxide , which will form _______ solution with water .
(e) If M is a non metal , it will not conduct electricity in the form of _______ .
2. Give one example in each case :
(1×5=5)
(a) A basic oxide which is soluble in water .
(b) A hydroxide which is highly soluble in water .
(c) A weak mineral acid
(d) A base which is not an alkali
(e) An oxide which is a base
3. Define : (2×3=6)
(a) A chemical bond
(b) An electrovalent bond
(c) A covalent bond
4. What are the conditions for the
formation of an electrovalent bond ? (3)
5. Draw electron dot diagram and structure
of :. (2×3=6)
(a) Nitrogen molecule
(b) Magnesium chloride
(c) Methane
6. Define a coordinate bond and give the condition for its formation . (5)
7. Explain the following methods with
examples. (2×5=10)
(a) Direct combination
(b) Displacement
(c) Double decomposition
(d) Neutralisation of insoluble base
(e) Neutralisation of an alkali
