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Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions.
(Mass of an electron = 9.1×10–31 kg)
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Find out the false sentences
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Find out the correct sentence
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Lysosome arises from
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Why are lysosomes known as ‘suicide-bags’ of a cell?
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Match the following A and B
| (A) | (B) | ||
| (a) | Smooth endoplasmic reticulum | (i) | Amoeba |
| (b) | Lysosome | (ii) | Nucleus |
| (c) | Nucleoid | (iii) | Bacteria |
| (d) | Food vacuoles | (iv) | Detoxification |
| (e) | Chromatin material and nucleolus | (v) | Suicidal bag |
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Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
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Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
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Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
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Which organelle is known as the powerhouse of the cell? Why?
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Name two biologically important compounds that contain both oxygen and nitrogen.
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What are the two forms of oxygen found in the atmosphere?
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Write short note on
Mitochondria
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What are main functional regions of the cell?
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Which organelle is the "power plant" of eukaryotic cell. Write in brief its functions.
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Draw a diagrammatic sketch of oxygen cycle in nature.
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An element has an atomic number of 11 and its mass number is 23. What is the arrangement of electrons in the shells? State nuclear composition of an atom of the element.
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If the number of electrons in an ion Z3– is 10, the atomic number of element Z will be :
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The atomic number of an element E is 16. The number of electrons in its ion E2– will be :
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The number of electrons in an ion Y2+ is 10. The atomic number of element Y is most likely to be :
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