Question

A. Fill in the blanks. 3

1) Change of water vapour into water is called …………..

2) Formation of salt from acid and base is called ………….. Change.

3) ……. Is an example of brittle metal.

4) The simplest type of chromatography is ………… chromatography.

5) ………… discovered presence of neutrons in nucleus of an atom.

6) The positively charged ions are called ……

B) Match the pairs. 2

A B

1) Sulphurous acid a) H3PO4

2) Sulphuric acid b) Pb(NO3)2

3) Lead nitrate c) H2SO3

4) Phosphoric acid d) H2SO4

C) Say ‘True ‘or ‘False’. 2

1) We can create or destroy matters.

2) Rusting is periodic change.

3) Sulphur is amorphous yellow non - metalic solid.

4) Mixture of ammonia and nitrogen can be separated by liquefaction.

D) Define the following terms. 4

1) Isotopes 2) A balanced chemical equation

3) Catalyst 4) Effervescence.

E) Name the following. 4

1) Any 4 elements and their symbols based on their Latin or Greek name.

2) Any 2 negative catalysts.

3) Any 2 trivalent positive radicals.

4) Any two methods to separate solid liquid mixtures.

Q.2.A) Answer the following questions. (Any 3) 6

1) What is mean by solvent extraction method? Explain with an example.

2) Enlist all characteristics of chemical reactions.

3) What do you understand by chemical bonds?

4) Draw structure and write electronic configuration of elements which has atomic number

i) 14 and ii) 20.

B) Differentiate between the following. 4

1) Reactants and products, 2) Acidic radicals and basic radicals.

Q. 3. Answer in detail the following questions (Any 3) 9

1) What are the ways by which chemical equations can be made more informative?

2) Define and explain variable valency with examples.

3) Which are different conditions required for chemical reactions to take place explain any

two with the example.

4) What are the two main features of Rutherford’s atomic model? Draw diagram to

show scattering of alpha particles by single atom.

Q.4.A) Give scientific reasons. (Any 2) 4

1) Atoms are electrically neutral.

2) Atoms combine to form molecules.

3) We need to balance chemical equations.

B) Write reaction and explain, what you observe when: (Any 2) 6

1) A few pieces of iron are dropped into blue solution of copper sulphate.

2) Solid lead nitrate is heated.

3) Zink granules are added to dilute Sulphuric acid.

Q. 5. Balance the chemical reactions step by step. (Any3) 6

1) Fe + HCl → FeCl2 + H2 2) BaCl2 + H2SO4 → BaSO4 + HCl

3) H2S + Cl2 → HCl + S 4)​

Answer 1

Answer:

one questiongive not so mucj

Answer 2

1). Condensation

2). neutralizing

3). Bone, cast iron, ceramic, and concrete are examples of brittle materials.

4).Paper chromatography

5).James Chadwick

6).protons

B)

1) sulphurous acid -H2SO3

2).sulphuric acid- H2SO4

3) lead nitrate-Pb(NO3)2

4)phosphoric acid-H3PO4


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its too long

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