Please select a subject first
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Explain how global warming takes place in the presence of green house gases. Give a reason why the surface temperature of earth is maintained in absence of green house gases.
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‘Oxides of nitrogen namely nitrous oxide, are released into the atmosphere from varied sources’. Explain the statement with relevant sources.
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Give balanced equation for the following conversion [one or two steps].
Nitrogen to nitrogen dioxide – in an internal combustion engine.
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The diagram represents the green house effect.
Does the sea level rise or fall due to global warming. Explain.
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Give a chemical test to distinguish between the following gases:
Carbon dioxide and sulphur dioxide
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Give a chemical test to distinguish between the following gases:
Sulphur dioxide and chlorine.
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Sulphur has an atomic number of 16 and a mass number of 32. State the number of protons and neutrons present in the nucleus of sulphur.
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Name the element which does not contain any neutrons in its nucleus.
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Write down the number of neutrons in the nucleus of an atom having atomic number 17 and mass number 37.
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Explain in brief the experimental proof which led to the discovery of –
Neutrons
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Complete and balance the equation:
Conversion of hydrogen to -
Water - 2H2 + O2 → ________
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Complete and balance the equation:
Conversion of hydrogen to -
Hydrogen chloride - H2 + Cl2 → ________
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Complete and balance the equation:
Conversion of hydrogen to -
Ammonia - N2 + 3H2 ⇌ ______
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Complete and balance the equation:
Conversion of hydrogen to -
Hydrogen sulphide - H2 + S → ________
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Complete and balance the equation:
Hydrogen in metallurgy - reduction of
Zinc oxide - ZnO + H2 → ________ + ______
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Complete and balance the equation:
Hydrogen in metallurgy - reduction of
Iron [III] oxide - Fe2O3 + 3H2 → ________ + ______
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State the number of neutrons in each of the atoms A to E. Also state which of the atoms A to E is a metal.
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Name the elements in Period 1.
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What is the common feature of the electronic configuration of the elements at the end of Period 2 and Period 3?
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Supply the missing word from those in bracket:
If an element has one electron in its outermost energy level [shell] then it is likely to be _______.
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