Time: 60 minutes(11 am - 12 noon) Class- IX F.M - 180(+3/-1 system) Declaration of Result in the internet(www.theuranium.org) : 15.03.2011 (There are 60 MCQs and each has one correct answer. You are required to darken the appropriate circle in the OMR answer sheet with the help of a HB pencil. Eraser can be used to change any answer. Note that improper darkening will make your answer sheet invalid by the computer. 3 marks will be given for each correct answer and 1 mark will be deducted for each wrong answer. Ball point pen can be used for darkening but once darkened cannot be erased) (Uploading of correct answer in the internet: 07.02.2011)
1. Which of the following compound on boiling with water produces ammonia gas (a) Mg3N2 (b) NH4Cl (c) NaNO2 (d) only (a) and (b)
2. Which of the following is not a redox reaction (equations are not balanced) (a) Sn + NaOH → Na2SnO3 + H2 (b) NH4NO3 → N2O + H2O
(c) PbO + KOH → K2PbO2 + H2O (d) Ca(OCl)Cl + NH3→ CaCl2 + N2 + H2O 3. Which of the following reaction is not possible under standard conditions( 250C and 1 atm. pressure)? (a) Fe + ZnO → Fe2O3 + Zn (c) Cu + AgNO3 → Ag + Cu(NO3)2 (c)Al + Mn3O4 → Mn + Al2O3 (d) Ca + NaCl → CaCl2 + Na 4. Which of the following will not react with conc. NaOH ?
(a) Zn(OH)2 (b) PbO (c) Al(OH)3 (d) Mg(OH)2 5. A white solid(X) on treatment with dilute HCl produces a reddish brown gas. The compound (X) gives a pungent smelling gas (Y) on heating with NaOH soluion. (Y) turns red litmus paper blue and forms a dense white fumes while a glass rod dipped in conc. HCl is shown over it. Then compound (X) is (a) NH4NO3 (b) NH4NO2 (c) NaNO2 (d) NH4Br
6. Cupric sulphate solution reacts with potassium ferrocyanide solution to give a chocolate brown precipitate. The formula of the precipitate and the name of the reaction respectively are (a) Cu2[Fe(CN)6], redox (b) Cu3[Fe(CN)6]2, non-redox
(c) Cu2[Fe(CN)6], double displacement (d) Cu[Fe(CN)6], precipitation 7. Which of the following is not a reduction process ?
– → MnO4
2- (b) Al3+→ Al (c) S → S2– (d) NO2
– → NO2 8. Which of the following is most soluble in organic solvent ? (a) MgCl2 (c) NaCl (c) KCl (d) BeCl2 9. Which type of bonds are present in potassium sulphate ? (a) only ionic (b) both ionic and covalent (c) ionic, covalent and dative (d) only covalent
10. Caesium chloride melts at 6450C while yellow phosphorous(P4) melts at 440C because (a) melting CsCl brings about breaking of ionic bonds while melting yellow P4 brings about breaking covalent bonds
(b) ionic bonds are always stronger than covalent bonds
(c) both (a) and (b) are correct
(d) melting CsCl brings about breaking of ionic bonds while melting of yellow P4 brings about weakening of weaker intermolecular forces
11. Which of the following has no lone pair of electrons on the central atom ? (a) SO2 (b)CO2 (c) H2O (d) NH3 12. Which of the following substance will have least conductivity in aqueous solution ? (a) ethyl alcohol (b)HCl (c) H3PO4 (d) NH3 13. The atomic number, period number and group number of element which is placed two places below the element having valence shell configuration 2s22p4 in the same group respectively are (a) 32, 4, VIA (b) 34, 4, VIA (c) 24, 3, VIA (d) 33, 4, VA
14. F, Cl, Br and I atoms in their gaseous state are fed with one electron each. Which will involve the release of the greatest amount of energy ?
(a) F (b) Cl (c) Br (d) I
15. Which of the following atoms in the gaseous state will require maximum energy to lose one electron ? (a) K (b) Na (c) Mg (d) Al
16. The correct order of atomic size is
(a) P > Mg > Ba > Cl (b) Cl > P > Mg > Ba (c) Ba > Mg > P > Cl (d) Ba > Mg > Cl > P
17. An element (A) has 2 electrons in its valence shell and another element (B) has 5 elements in its valence shell. Then a possible compound between A and B will be
(a)A3B2 (b)A2B3 (c)A5B2 (d) A2B5 18. The number of moles of calcium,...