CHEMISTRY QUESTION PAPERS

X-STATE


CHEMISTRY

TERM EXAM

( MM-50)

PART-1

1 M.C.Q. ( Each 1 mark)

i) The formula of propyne-

a) C 3H3 b) C 3H6 c) C 3H8 d) C 3H4

ii) The non metal that exhibits allotropy

a) O 2 b) N2 c) H2 d) P

iii) Sun is mostly made up of

a) O 2 b) N2 c) H2 d) coal

iv) Radioactivity was first observed is

a) Radium b) Iridium c) Gallium d) Uranium

v) Sodium is stored in kerosene , because

a) Kerosene is cheap b) sodium reacts with air c) None

vi) Isomers differ in

a) Physical properties b) Chemical properties c) Both d) both are same

vii) The general formula of Alkene

a) C nH n b) C nH2n c) C nH2n-2 d) C nH2n+2

viii) Mg +dil HCl =

a) MgO b) MgH c) MgCl2 d) MgSO4

ix) The nucleons in the nucleus are bound by

a) Binding energy b) BE/ nucleon c) nuclear force d) atomic force

x) Hydrogen bomb is based on the principle of

a) Nuclear fission b) Nuclear fusion c) Artificial radioactivity d) Spontaneous disintegration

xi) In nuclear reactors the control rod are made of

a) Graphite rod b) Cadmium rod c) Ag rod c) None

xii) In what form do we get solar energy?

a) Wind energy b) Hydro energy c) Electromagnetic radiation d) magnetic energy

xiii) Name one non-renewable energy source that we are

a) Sun b) Wind c) Natural gas d) Geothermal energy

xiv) What is the gas produced when metal react with dilute minerals acids?

a) Nitrogen b) Hydrogen c) Oxygen d) Carbondioxide

xv) Nucleus is the totality of

a) Electrons, neutrons b) electrons, protons c) neutrons, protons d) protons, neutrons

xvi) The chemical formula of rust is ______.

xvii) Electronic configuration of Cu________________.

xviii) Nickel, copper and Zinc are the components of the alloy___________.

xix) The chemical formula of azurite is ________________.

xx) The method used to concentrate copper ore,is_______________.

PART -2

Answer all in one or two sentences- ( Each 1 marks)

1. What are the fundamental particles of an atom?

2. What is meant by higher binding energy?

3. Which form of energy trapped in the fossil fuels?

4. Mention different forms of energy.

5. Write the reaction of sodium with water . mention the gas liberated.

6. What is catination?

7. Mention the classification of hydrocarbon.

8. Write the reaction of copper with concentrated nitric acid.

9. Define half –life period of a radioactive element.

10. Mention two ores of copper with chemical formula.

PART -3

Answer all in three or four sentences- ( Each 2 marks)

1 . Explain method of purification of copper with diagram.

2.Write the reaction of the following metals with chlorine.

a) Al b) Fe

3.Describe the working of a solar water heater along with diagram.

4. Explain nuclear fission with an example.

5.Electrons have no role in nuclear reactions- Give reason.

6. What are isotopes ?Write two examples.

7.Explain induced radioactivity with an example.

8.Make a list of methods of saving energy.

9. Explain cracking with an example.

10. Write the molecular and structure formula of the following alkynes and alkene-

a) Ethyne b) Butene