Trending ▼   ResFinder  

ICSE Class X Mid-term 2025 : Chemistry

6 pages, 92 questions, 0 questions with responses, 0 total responses,    0    0
Anubhav Sarkar
Garden High School, Kolkata
+Fave Message
ProfileTimelineUploads
 Home > anubhav_s >

Formatting page ...

GARDEN HIGH SCHOOL CLASS X Half-Yearly Examination 2017 Chemistry Time: 2 hours Full Marks: 80 This Question Paper has six printed pages. Answers must be written in the script/s provided. You will not be allowed to write for the first 15 minutes. This time must be spent in reading the Question Paper. The time given at the head of this Paper is the time allowed for writing answers. This Paper is divided into two sections. Answer all the parts of Q No 1 (Section I) and any four questions of Section II. Maximum marks for a question or part of a question are given in brackets [ ]. SECTION I (40 marks) Answer all the parts. Question No 1 (a) Fill in the blanks: (i) [5] In the Ostwald s process, a mixture of pure dry ammonia and air in the ratio of ______ by volume is compressed and then passed over ______ at about ______ C, resulting in the ______ oxidation of ammonia. (ii) In the Haber s process, the ammonia gas produced is separated from the unreacted nitrogen and hydrogen by the method of ______. (iii) HCl gas produced in the laboratory cannot be dried using phosphorus pentoxide as it produces ______ and ______ . (iv) Ammonia gas produced in the laboratory is collected by the ______ displacement of ______. (v) Nitric acid cannot be concentrated beyond 68% by distillation when it forms a/an ______ mixture. (b) Choose the appropriate answer from the given options: (i) The salt that produces a red solution with methyl orange is: (A) NaHCO3 (C) Na2SO4 (B) K2CO3 (D) ZnSO4 [5] (2) (ii) The ion that is discharged at the anode during the electrolysis of brine is: (A) Cl (C) Na+ (B) OH (D) H+ (iii) The choride that dissolves in an excess of NH4OH solution but not in NaOH solution is: (A) PbCl2 (C) CuCl2 (B) ZnCl2 (D) CaCl2 (iv) The compound that does not have any lone pair of electrons in its molecule is: (A) CCl4 (C) H2O (B) NH3 (D) C2H4 (v) The maximum number of gram molecules is present in: (c) (i) (A) 11.2 litres of hydrogen at STP. (B) 24.5g of sulphuric acid. (C) 18.069 x 1022 molecules of ammonia. (D) 24.092 x 1022atoms of oxygen. Calculate: (A) The number of atoms of oxygen present in 88g of CO2. (B) The number of sodium ions present in 14.2g of sodium sulphate. (C) The number of electrons present in 8g of oxide ion. [3] (ii) How many litres of oxygen at STP are required to burn 2.2g of propane, completely? (d) Name the gases produced when: (i) Hydrogen sulphide gas reacts with cold and dilute nitric acid. (ii) Ammonia is passed over heated sodium. (iii) Dilute hydrochloric acid is added to sodium thiosulphate. (iv) An excess of ammonia reacts with chlorine. (v) Concentrated sulphuric acid is added to oxalic acid. [2] [5] (3) (e) State one observation when: (i) [5] Ammonia gas burns in air. (ii) A few drops of NaOH solution is added to green vitriol. (iii) Magnesium nitride is hydrolyzed. (iv) Nitric acid is heated with copper turnings and concentrated sulphuric acid. (v) An excess of ammonia solution is added to a solution of copper sulphate. (f) (i) Draw the electron dot diagrams of: (A) H3O+ (B) [3] MgCl2 (C) C2H2 (ii) Draw the structure of: (g) (i) [2] (A) The third member of the alkene series. (B) A functional group isomer of ethanoic acid. Define: [3] (A) a homologous series (B) an acid salt (C) electroplating (ii) Name the functional group present in: (A) HCOOH (h) [2] (B) CH3CHO Give balanced chemical equations of the reactions required to carry out the following conversions: ZnSO4 A [5] B ZnCO3 E ZnO D ZnCl2 C Zn(OH)2 SECTION II (40 marks) Answer any four questions. Question No 2 (a) Pick the odd one out and justify your choice: (i) [5] lead nitrate, zinc nitrate, calcium nitrate, aluminium nitrate (ii) calcium, chlorine, phosphorus, magnesium (iii) bleaching powder, potassium ferrocyanide, Nessler s reagent, sodium argento cyanide (4) (iv) NaOH, Na2CO3, Cu(OH)2, H2CO3. (v) copper, nickel, iron, silver. (b) Give the IUPAC names of the following compounds: (i) H3C H3C (i) CH 3 CH CH CH2 CH2 C [3] CH2 O H (iii) CH 3 CH2 CH CH 3 OH (c) Classify the following into saturated and unsaturated hydrocarbon compounds: [2] C3H6, C4H10, C4H6, C3H8 Question No 3 (a) State Avogadro s law. [1] (b) What weight of zinc would be required to react with dilute sulphuric acid to produce enough hydrogen that can completely reduce 8.5g of cupric oxide to copper? [Zn = 65.5, Cu = 63.5] (c) (d) [4] Give balanced chemical equations of the reactions involved in the preparation of sulphuric acid by the Contact process. [3] Arrange the following as directed: [2] (i) Na+, Al3+, K+ and Mg2+ in the decreasing order of their ionic radii (ii) CH4, H2O, NH3 and HF in the increasing order of their covalency Question No 4 (a) Distinguish between: (i) RAM and RMM (ii) Electron affinity and electronegativity [2] (5) (b) A compound on analysis gave the following percentage composition: [3] Na = 14.31%, S = 9.97%, H = 6.22%, O = 69.5%. Calculate the molecular formula of the compound on the assumption that all the hydrogen in the compound is present in combination with oxygen as water of crystallization. The molecular mass of the compound is 322. (c) [Na = 23, S = 32, H = 1, O = 16] Give balanced chemical equations to prove the following: (i) [5] Ammonia gas can be produced from ammonium sulphate. (ii) Nitric acid can be converted to sulphuric acid. (iii) Amphoteric metals can liberate hydrogen from strong alkalis. (iv) Nitric acid contains nitrogen in its molecule. (v) Ammonia can act as a reducing agent. Question No 5 (a) Complete the following table: Process Electrolyte [5] cathode anode used extraction of (1) aluminium purification of copper sulphate copper solution mixed with dilute ion discharged at the cathode (2) (4) graphite rods (5) (3) Cu2+ sulphuric acid (b) Give reasons why: (i) [5] A freshly prepared ferrous sulphate solution is used for the Ring Test. (ii) Graphite anode is chosen over platinum anode for the electrolysis of molten lead bromide. (iii) Alkenes are, in general, more reactive than alkanes. (iv) Nickel and chromium are used to electroplate iron objects. (v) The atomic radii of elements increase as we go down a group. Question No 6 (a) State the Modern Periodic Law. [1] (6) (b) The elements A, B, C, D, E and F have atomic numbers Z + 2, Z 1, Z, Z 2, Z + 1 and Z + 3 respectively. Z has a stable octet structure. (i) [4] Name the element with the highest Ionization Potential. (ii) Name the element whose oxide is strongly basic in nature. (iii) Arrange the elements in the increasing order of their Electron Affinity. (iv) Draw the electron dot diagram of the compound formed between the elements D and E. (c) Using dilute sulphuric acid, prepare the following: (i) [3] An insoluble sulphate from a soluble nitrate (ii) A dibasic acidic gas (iii) A sodium salt (d) What do you observe at the electrodes during the electrolysis of copper sulphate solution using a copper anode? [1] (e) What is anode mud? [1] Question No 7 (a) Give a chemical test to distinguish between: (i) Pb(NO3)2 and AgNO3 (iii) [3] ZnSO4 and Al2(SO4)3 (ii) Na2SO3 and Na2CO3 (b) Identify: (i) [7] A blue compound that liberates a reddish brown gas when heated in a dry test tube. (ii) A white crystalline solid that dissolves in an excess of NaOH solution but does not dissolve in dilute acids. (iii) An orange solid that liberates a greenish yellow gas when heated with conc HCl but does not produce any precipitate. (iv) A green compound that dissolves in dilute mineral acids but not in an excess of NaOH solution. (v) A blue compound that produces a white precipitate when treated with barium chloride solution. vi) A double salt that helps in the purification of water. (vii) A gas whose liquid form is used as a refrigerant.

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

Formatting page ...

 

  Print intermediate debugging step

Show debugging info


 

 

© 2010 - 2025 ResPaper. Terms of ServiceContact Us Advertise with us

 

anubhav_s chat