Chemistry test paper for students of class 7 of ICSE Board. This test paper includes two chapter of the chemistry which will be helpful to the students of class 7.
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| Chemistry test paper class 7 ICSE Board 2023 - 24 (J K Online Classes) |
Chemistry test (2023 - 24)
Class 7 (ICSE Board)
Chapters:
Total marks: 41 Marks
Total time: 1 Hour
(A) Choose the correct answers: (1 marks each)
1. Which of the following techniques is used to separate components of mixture of miscible liquids?
(a) Evaporation
(b) Fractional distillation
(c) Sublimation
(d) Filtration
2. Which of the following method is used by gulf countries to get drinking water from seawater?
(a) Distillation
(b) Filtration
(c) Sublimation
(d) Chromatography
3. Which of the following is electrically neutral?
(i) Electron
(ii) Proton
(iii) Neutron
(iv) None of these
4. Which of the following is a poly-atomic cation?
(i) Ammonium ion
(ii) Magnesium ion
(iii) Chloride ion
(iv) Bromide ion
5. Which of the following elements is potassium hydroxide made up of?
(i) Potassium and oxygen
(ii) Potassium and hydrogen
(iii) Potassium, hydrogen and oxygen
(iv) potassium only
6. Which of the following is a mono-atomic molecule?
(i) Helium
(ii) Hydrogen
(iii) Chlorine
(iv) Oxygen
(B) Fill in the blanks: (1 marks each)
1. Pure substances are classified into __________ and _________.
2. __________ have definite properties and definite composition.
3. The positive ion is called __________ and the negative ion is called __________.
4. Electrons were discover by ____________.
5. The combining capacity of elements is known as ___________.
(C) Write T for true and F for False: (1 marks each)
1. Atoms of certain element combine to form molecules of those elements.
2. Baking soda is not a compound.
3. Poly-atomic molecules are made up of more than three atoms.
4. Radicals are molecular species carrying a net charge.
5. Metalloids are those substances which shows the property of neither metal nor non-metal.
(D) Answer the following questions in brief: (2 marks each)
1. How are mixtures classified on the basis of distribution of their constituent particles?
2. Give use of separating funnel.
3. Define the following: (i) Solution, (ii) Alloy
4. Explain the following terms: (i) Valency, (ii) Radicals
5. Give one difference between molecule of an element and molecule of a compound.
(E) Answer the following questions in detail: (3 marks each)
1. Give postulates of Dalton's atomic theory.
2. Define atomicity. How are molecules classified on the basis of their atomicity?
3. What are poly-atomic ions? Name two poly-atomic cations and anions.
4. Give a brief summary of the differences of elements, compounds and mixtures.
5. Explain how fractional distillation is used to separate miscible liquids.
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