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Chemistry Test 2


(i)         All questions are compulsory.

(ii)        Questions 1 to 12 are very short answer type questions. These questions carry one mark each.

(iii)       Questions 13 to 20 are short answer type questions. These questions carry two marks each.

(iv)       Questions 21 to 24 are also short answer type questions. These questions carry three marks each.

(v)        Questions 25 to 26 are long answer type questions and carry five marks each.

Question 1 ( 1.0 marks)
Give an example each of bulk phenomenon and surface phenomenon.
Question 2 ( 1.0 marks)
What do you understand by latent heat of fusion (LHF)?
Question 3 ( 1.0 marks)
Name a gaseous solution.
Question 4 ( 1.0 marks)
Why do liquids such as lemonade taste the same throughout?
Question 5 ( 1.0 marks)
Why is oxygen diatomic?
Question 6 ( 1.0 marks)
Calculate the formula unit mass of common salt.
Question 7 ( 1.0 marks)
Define Avogadro constant (NA).
Question 8 ( 1.0 marks)
Define molar mass.
Question 9 ( 1.0 marks)
Write the chemical formula for aluminium chloride.
Question 10 ( 1.0 marks)
Write a use of an isotope of uranium.
Question 11 ( 1.0 marks)
What are alpha (α) particles?
Question 12 ( 1.0 marks)
Name a compound responsible for ozone depletion.
Question 13 ( 2.0 marks)
Among carbon dioxide, water and salt, which has the:
(i) Maximum kinetic energy of particles
(ii) Most ordered arrangement of particles
Question 14 ( 2.0 marks)
Why do we see water droplets on the outer surface of a glass containing cold water?
Question 15 ( 2.0 marks)
Define solution, solvent and solute. Give one example of each.
Question 16 ( 2.0 marks)
Which of the following substances are mixtures?
Soil, air, sugar, salt
Question 17 ( 2.0 marks)
How many moles are present in 18.066 × 1023 of He atoms?
Question 18 ( 2.0 marks)
Calculate the number of neutrons and protons in .
Question 19 ( 2.0 marks)
Name the parts labelled as i, ii and iii in the given figure.
Question 20 ( 2.0 marks)
Mention four methods for preventing soil erosion.
Question 21 ( 3.0 marks)
Answer the following questions.
(i) A substance has neither a definite volume nor a definite shape. What can you say about the physical state of such a substance?
(ii) If some alcohol is rubbed on the hand, the rubbed portion of the hand feels cool. Why?
Question 22 ( 3.0 marks)
Write four postulates of Dalton’s atomic theory.
Question 23 ( 3.0 marks)
Answer the following questions.
(i) Calculate the maximum number of electrons in:
(a) K shell
(b) M shell
(ii) What are isobars? Give an example.
Question 24 ( 3.0 marks)
Answer the following questions.
(i) What discovery was made as a result of Rutherford’s alpha-particle scattering experiment?
(ii) Complete the table.
Name of element
Atomic no.
Atomic mass
No. of electrons
No. of protons
No. of neutrons
_______
17
________
________
________
20
Question 25 ( 5.0 marks)
Answer the following questions.
(i) What is Tyndall effect? Which solution shows Tyndall effect?
(ii) Write the properties of a true solution.
(iii) What is the size of the particles of a true solution?
Question 26 ( 5.0 marks)
Answer the following questions.
(i) Name the factors responsible for the formation of soil.
(ii) Explain the importance of ozone.
(iii) Explain the importance of nitrogen-fixing bacteria. Where are they found?

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