Please select a subject first
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Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
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The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
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Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are 200.6 g mol–1 and 32 g mol–1 respectively.
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Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight.
- Whose container is heavier?
- Whose container has more number of atoms?
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Fill in the missing data in the Table
| Species Property | H2O | CO2 | Na atom | MgCl2 |
| No. of moles | 2 | - | - | 0.5 |
| No. of particles | - | 3.011×1023 | - | - |
| Mass | 36g | - | 115 g | - |
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The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe?
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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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