ICSE Set Set1 Year Icse Chemistry99 Set1.php Chemistry Exam Paper for students online
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|Q2.(a) Choose the
Correct word or phrase from the bracket to complete the following
(i) Ammonium chloride is a soluble salt prepared by ___________ (precipitation, neutralization).
(ii) When ammonium chloride is heated, it undergoes __________ (thermal decomposition, thermal dissociation).
(iii) Heating ammonium chloride with sodium hydroxide produces __________ (ammonia, nitrogen).
(iv) Heating a solution of ammonium chloride and sodium nitrite produces __________ (ammonia, nitrogen).
Q2.(b) Write the correctly balanced
equation for each of the reactions mentioned in statements (i) - (iv)
Q2.(c) Describe what you see when
concentrated nitric acid is added to copper.
Q.3(a)(i) What is the colour of the flame seen when sulphur burns in air ?
Q.3(a)(ii) Name the product formed when sulphur is burnt in air or oxygen.`
Q.3(a)(iii) When burning sulphur reacts with water, a compound is formed. Name the compound.
Q.3(a)(iv) Write the balanced equation for the reaction between sulphur dioxide and moist chlorine.
Q.3(a)(v) In the reaction mentioned in question (iv) above, which substance is the oxidizing
Q.3(b)(i) What is the purpose of the
Contact Process ?
Q.4(a) With reference to the reduction of copper oxide, iron (II) oxide, lead (II) and magnesium oxide by hydrogen, place the oxides in order of increasing ease of reduction. That is, put first the oxide that is most difficult to reduce ; and last, the oxide that is most easily reduced.
Q.4(b) Write balanced equations for the following reactions :
Q.4(b)(i) Reduction of copper oxide by hydrogen.
Q.4(b)(ii) Reduction of iron (III) oxide by carbon monoxide.
Q.4(b)(iii) Reduction of lead (II) oxide by carbon.
Q.4(c)(i) What is the type of bonding expected in a metallic chloride ?
Q.4(c)(ii) If a fused metallic chloride is electrolysed, at which electrode would the metal be obtained ?
Q.4(c)(iii) What metallic property is shown by the non-metal graphite ?
Q.4(d)(i) Cast iron contains about
4% carbon. By what chemical process is the amount of carbon decreased to
make steel ?
Q5.(a) Concentrated nitric acid oxidises phosphorus to phosphoric acid according to the following equation :
P + 5HNO3 ¾® H3PO4 + H2O + 5NO2
Q5.(a)(i) What mass of phosphoric acid can be prepared from 6.2 g of phosphorus ?
Q5.(a)(ii) What mass of nitric acid will be consumed at the same time ?
Q5.(a)(iii) What would be the volume of steam produced at the same time if measured at 760 mm Hg pressure and 273oC ?
(H = 1; N = 14; O = 16; P = 31)
Q.5(b) Ammonia may be oxidized to nitrogen monoxide in the presence of a catalyst according to the following equation :
4NH3 + 5O2 ¾® 4NO + 6H2O
If 27 litres of reactants at the same temperature and pressure ?
Q.6(a) For each of the compounds (i) Ethane, (ii) Vinegar and (iii) Marsh gas, draw the relevant structural formula.
Q.6(b)(i) What word is used to describe these three compounds taken together ?
Q.6(b)(ii) What is the special feature of the structure of :
What type of reaction is common to both these compounds ?
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