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10/22/21, 9:21 PM CHEMISTRY -CLASS 10-PREBOARD CHEMISTRY -CLASS 10-PREBOARD READ THE QUESTIONS CAREFULLY ALL QUESTIONS ARE COMPULSORY THERE ARE TOTAL 35 QUESTIONS FULL MARKS :40 The respondent's email (null) was recorded on submission of this form. * Required 1. Email * 2. NAME OF THE STUDENT: * 3. SECTION: * Mark only one oval. 10A 10B 10C 10D 10E 1) The electronegativity of three elements X, Y, Z are 1.0,1.5 and 4. Choose the correct option: https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 1/13 10/22/21, 9:21 PM 4. CHEMISTRY -CLASS 10-PREBOARD i) Which Elements will form a covalent compound? * 1 point Mark only one oval. A) X and Y B) X and Z C) none of the elements 5. ii) Which Elements will form an ionic compound? * 1 point Mark only one oval. A) X and Y B) X and Z C)Y and Z 6. iii) If X is a divalent metal, what will be the formula of its oxide * 1 point Mark only one oval. A) X O B)XO C) XO 7. iv) What type of bond is present between two Z atoms? * 1 point Mark only one oval. A) covalent B) polar covalent C) non polar covalent https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 2/13 10/22/21, 9:21 PM 8. CHEMISTRY -CLASS 10-PREBOARD 2) Electrolysis of dilute potassium bromide solution will form ____ at the 1 point cathode: * Mark only one oval. A) sodium B) chlorine C) oxygen D) hydrogen 9. 3) An analysis of an inorganic salt gave the following percentage 2 points composition: Na = 14.28 %; S = 9.92 %; H = 6.20 % Assuming all the hydrogen combines with oxygen to form water, and the molecular mass of the crystalline salt is 322, the correct molecular formula would be ____ . (Atomic mass: Na=23, H=1, O=16, S=32) * Mark only one oval. A) Na SH O B) Na SH O C) Na S H O D) Na S H O 10. 4) Aluminium hydroxide is soluble in excess of NaOH forming the ion : * 1 point Mark only one oval. A) AlO B) AlO C) AlO D) AlO https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 3/13 10/22/21, 9:21 PM 11. CHEMISTRY -CLASS 10-PREBOARD 5) Metal + Alkali Salt + ____ * 1 point Mark only one oval. A) H B) N C) H D) OH 12. 6) The largest atomic radius in period 2 is: * 1 point Mark only one oval. A) Li B) Be C) B D) Na 13. 7) A 0.500 g sample of a compound containing only antimony and 2 points oxygen was found to contain 0.418 g of antimony and 0.082 g of oxygen. What is the simplest formula for the compound?(Atomic mass Sb=122,O=16) * Mark only one oval. A) SbO B) SbO C) Sb O D) Sb O https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 4/13 10/22/21, 9:21 PM 14. CHEMISTRY -CLASS 10-PREBOARD 8) A compound which liberates reddish brown gas around the anode 1 point during the electrolysis in its molten state is: * Mark only one oval. A) Sodium chloride B) Copper (II) oxide C) Copper (II) sulphate D) Lead bromide 15. 9) Methyl orange is: * 1 point Mark only one oval. A) Pink in acidic medium, yellow in basic medium B) Yellow in acidic medium, pink in basic medium C) Colourless in acidic medium, pink in basic medium D) Pink in acidic medium, colourless in basic medium. 16. 10) An aqueous solution of the electrolyte consists of the ions mentioned 1 point in the list, the ion which could be discharged most easily during electrolysis is: * Mark only one oval. A) Fe B) Cu C) Pb D) H https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 5/13 10/22/21, 9:21 PM 17. CHEMISTRY -CLASS 10-PREBOARD 11) In an accident at a factory, some nitric acid was spilled. Which 1 point substance, when added in excess, would affect the acid without leaving traces of the alkaline solution? * Mark only one oval. A) aqueous ammonia B) aqueous sodium hydroxide C) water D) aqueous calcium hydroxide 18. 12)In the electrolysis of copper (II) chloride solution, what do you see at 1 point the negative electrode: * Mark only one oval. A) bubbles of gas B) red/ brown solid C) nothing D) blue solid 19. 13) An element M is in group 13th of the periodic table, the formula for its 1 point oxide is: * Mark only one oval. A) MO B) M O C) M O D) M O https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 6/13 10/22/21, 9:21 PM 20. CHEMISTRY -CLASS 10-PREBOARD 14) Which of the following does not form an acidic salt? * 1 point Mark only one oval. A) Phosphoric acid B) Carbonic acid C) Sulphuric acid D) Hydrochloric acid 21. 15) The vapour density of gas A is four times that of B. If the molecular 1 point mass of B is M, then the molecular mass of A is: * Mark only one oval. A) M B) M/4 C) 4M D) 2M 22. 16) When base reacts with the non-metal oxide: * 1 point Mark only one oval. A) it neutralizes each other B) it creates fire C) it produces acidic salts D) it produces basic salts 23. 17) Protons play an important role in which type of bonding? * 1 point Mark only one oval. A) electrovalent B) hydrogen C) covalent D) coordinate https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 7/13 10/22/21, 9:21 PM 24. CHEMISTRY -CLASS 10-PREBOARD 18) If an element belongs to third period and group 16 then it will have: * 1 point Mark only one oval. A) 3 shells and 2 valence electrons B) 2 shells and 3 valence electrons C) 3 shells and 6 valence electrons D) 3 shells and 16 valence electrons 25. 19) Sodium hydrogen carbonate when added to acetic acid evolves a gas. 1 point Which of the following statements are true about the gas evolved?(i) It turns lime water milky(ii) It extinguishes a burning splinter(iii) It turns the colour of acidified potassium dichromate paper(iv) It has a pungent odour * Mark only one oval. A) (i) and (ii) B) (ii) and (iii) C) (ii), (iii) and (iv) D) (i) and (iv) 26. 20) With reference to the variation of periodic properties, which of the following is generally true? * 1 point Mark only one oval. A) Atomic size increases from left to right across a period. B) Ionisation potential increases from left to right across a period. C) Electron affinity increases on going down a group. D) Electronegativity increases on going down a group. https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 8/13 10/22/21, 9:21 PM 27. CHEMISTRY -CLASS 10-PREBOARD 21) Which among the following cations will discharge with ease at 1 point cathode? * Mark only one oval. A)Na B)Au C)zn D)H 28. 22) An aqueous solution of a salt produces a white ppt. on adding sodium 1 point hydroxide solution which dissolves in excess of NaOH and a white ppt with NH OH which is insoluble in excess, the metallic ion in the salt is: * Mark only one oval. A) Zn B) Pb C) Ca D) Al 29. 23) Valency of an element, while going down a group in the long form of the periodic table * 1 point Mark only one oval. A) increases B) decreases C) remains same D) none of these https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 9/13 10/22/21, 9:21 PM 30. CHEMISTRY -CLASS 10-PREBOARD 24) Positive ions (cations) will move towards the cathode (-) where they 1 point will discharge by.... * Mark only one oval. A) Breaking apart B) Losing electrons C) Clumping together. D) Gaining electrons 31. 25) The molecular formula of an organic compound is C H O and 1 point empirical formula weight is 83. The empirical formula of the compound is: * Mark only one oval. A) C H O B) C HO C) C H O D) C HO 32. 26) Among the elements of period 2, the element which has the highest 1 point electron affinity is: * Mark only one oval. A) Lithium B) Carbon C) Chlorine D) Fluorine https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 10/13 10/22/21, 9:21 PM 33. CHEMISTRY -CLASS 10-PREBOARD 27) The bond in methane is: * 1 point Mark only one oval. A) single covalent bond B) double covalent bond C) triple covalent bond D) coordinate covalent bond 34. 28) What is the product formed at the cathode in the electrolysis of 1 point aqueous Na SO ? * Mark only one oval. A) Sodium metal B) Oxygen gas C) Hydrogen gas D) Sulphur 35. 29) In a periodic table, alkali metals are placed in group: * 1 point Mark only one oval. A)1 B) 11 C) 17 D) 18 https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 11/13 10/22/21, 9:21 PM 36. CHEMISTRY -CLASS 10-PREBOARD 30) When the sample of copper with zinc impurity is to be purified by 1 point electrolysis, the appropriate electrodes are: * Mark only one oval. A) pure zinc (cathode), pure copper(anode) B)impure sample (cathode) pure copper(anode) C) impure zinc (cathode), impure sample(anode) D)pure copper(cathode), impure sample(anode) 37. 31) An atom with atomic number 20 is most likely to combine with the 1 point atom whose atomic number is: * Mark only one oval. A) 18 B) 11 C) 16 D) 10 38. 32) An element X forms a chloride with the formula XCl , which is a solid with high melting point. X would likely be in the same group of the 1 point periodic table as: * Mark only one oval. A) Na B) Mg C) Si D) Al https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 12/13 10/22/21, 9:21 PM 39. CHEMISTRY -CLASS 10-PREBOARD 33) Fused NaCl on electrolysis gives .. on cathode. * 1 point Mark only one oval. A)Chlorine B) Sodium C) Sodium amalgam D) Hydrogen 40. 34) What is the preferred electrode when it is not allowed to take part in the chemical reaction? * 1 point Mark only one oval. A) Gold B) Silver C) Copper D) Graphite 41. 35) The basicity of acetic acid is: * 1 point Mark only one oval. A) 1 B) 2 C) 3 D) 4 This content is neither created nor endorsed by Google. Forms https://docs.google.com/forms/d/1G04x8GR3MpZetmr3eWxv6E3-oSmw4eFAByu6FzHZXoo/edit?ts=61726e45 13/13
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