9th class guess paper of chemistry

Zahoor ul islam boys high school gujar khan.

Class.      10^th.      Subject.     Chemistry.    Year.    2019.

(Part-I)

QNo.2: Answer any 5 of following?                                                                                    (5×2 = 10)

i) Define law of mass action?

ii) What do you meant by equilibrium constant?

iii) Give 2 characteristics of forward reaction?

iv)  How direction of reaction can be predicted?

v)  How BF₃ behaves as Lewisacid?

vi)  Prove that water is an amphoteric specie?

vii)  Define pH value. What is pH of pure water?

viii) How are soluble salts recovered from water?

QNo.2: Answer any 5 of following?                                                                                     (5×2 = 10)

i) Define homocyclic compounds

ii) Describe 2 isomers of C₅H₁₂?

iii) What are alkyl radicals? Give their general formula.

iv) Why alkenes are called olefins?

v) Write equation for hydrogenation of alkenes

vi)  How plants synthesize carbohydrates?

vii) What are hydrocarbons?

viii) Give general formula of lipids?

QNo.2: Answer any 5 of following?                                                                                      (5×2 = 10)

i) Write percentage composition of atmosphere by volume?

ii) Give two effects of SO₂?

iii) Define ozone and ozone hole?

iv) Define soft and hard water?

v) Give chemistry of swimming pool cleanliness?

vi) Define gangue and metallurgy?

vii) How Na₂CO₃ is obtained from NaHCO₃?

viii) How ammonia is prepared by Haber's process?

(Part-II)

Answer any 2 of following.                                                                                                   (9×2= 18)

QNo.5: a) What is importance of equilibrium constant?                                      (5) 

b) Write down any 4 uses of bases?                                                                      (4)

QNo.6: a) Describe the uses of ethene?                                                                (5)

b) Write a note on monosaccharides?                                                                   (4)

QNo.7: a) Define refining. Explain fractional distillation of petroleum?            (5)

b) Explain any 2 waterborne diseases. How they can be prevented?                   (4)