Organisation : International Junior Science Olympiad
Exam : International Junior Science Olympiad Exam
Document Type : Sample Question Paper
Category or Subject :
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International Junior Science Olympiad Sample Question Paper :
Examination Rules :
1. You are NOT allowed to bring any personal items into the examination room, except for personal medicine or approved personal medical equipment.
Related : International Junior Science Olympiad Theoretical Sample Question Paper : www.pdfquestion.in/9331.html
2. You must sit at your designated desk.
3. Check the stationeryitems (pen, calculator, and rough book) provided by the organizers.
4. Do NOT start answering the questions before the“START”whistle.
5. You are NOT allowed to leave the examination room during the examination except in an emergency in which case you will be accompanied by a supervisor/volunteer/invigilator.
6. DoNOT disturb other competitors. If you need any assistance, you may raise your hand and wait for a supervisor to come.
7. Do NOT discuss the examination questions. You must stay at your desk until the end of the examination time, even if you have finished the exam.
8. At the end of the examination time you will hearthe“STOP” whistle. Do NOT write anything more on the answer sheet after this stop whistle. Arrange the exam,answer sheets, and the stationary items(pen, calculator, and rough book)neatly on your desk.Do NOT leave the room beforeall the answer sheets have been collected.
Question :
1. Below is incomplete information for neutral atoms I and II.
Which of the following is correct?
(A) a = 7
(B)b = 8
(C) Atomic number of I is 14.
(D) I and II are isotopes of the same element.
2. Which of the following is the correct order of the decreasing ionic radius for Na+, Mg2+, O2-, and F-?
(A) Na+>Mg2+> F->O2-
(B) Mg2+> Na+> O2->F-
(C) O2->F-> Na+> Mg2+
(D) F-> O2-> Mg2+> Na+
3. Which of the following molecules has a non-zero dipole moment?
(A) CO2
(B) CCl4
(C) C2H2
(D) H2Se
4. The reaction rate is the change in concentration of a reactant or product with time, the unit of which is M/s. When the reaction rate depends on then-th power to the concentration of a reactant, [R] – wherek is the rate constant, it is called an n-th order reaction. The following graph shows [R] as a function of time for the chemical reaction R ? P. (P denotes the product). M = moles/litre Which of the following is correct for both n and the unit of k for the reaction R ? P?
(A) 0, 1/s
(B) 0, M/s
(C) 1, 1/s
(D) 1, M/s
5. A gaseous hydrocarbon X has a density of 1.25 g/L at0 ?C and under 1 atm. What is the mass fraction of carbon in X? (The atomic masses of carbon and hydrogen are 12.0 and 1.00 g/mol, respectively, and 1.00 mole of gas occupies a volume of 22.4 L at0 ?C and under 1 atm.)
(A) 75.0 %
(B) 80.0 %
(C) 85.7 %
(D) 92.3 %
6. What is the electron configuration for the most stable ion of aluminum?
(A) 1s22s22p63s2
(B) 1s22s22p6
(C) 1s22s22p53s1
(D) 1s22s22p63p2
7. The standard enthalpy of formation ( )of a substance is the enthalpy change during a process, where the substance is formed from the most stable forms of the constituent elements at 1 atm.The following figure is the enthalpy diagram of N-, or O-containing compounds. ’s are the standard enthalpy changes for the corresponding processes at 25oC.
What is the of NO2(g) at 25oC?
(A) 10 kJ/mol
(B) 510 kJ/mol
(C) -460 kJ/mol
(D)-1430 kJ/mol
8. The table below shows the acid dissociation constant ( ) of three chemical species at 25??C. Which of the following options from A to D choosesall the correct statement(s) from the box below?(Assume that the temperaturesof the solutions arekept constant at 25 ?C.)
1. 0.1 M HCN(aq) is basic.
2. The pH of 0.1 M HF(aq) is lower than the pH of 0.1 M CH3COOH(aq).
3. The concentration of H+ is higher in 1 M HCN(aq) than in 0.1M CH3COOH(aq).
9. A U-shaped tube with a semipermeable membrane was filled with 2 L of water as shown in figure I. When 0.1 mol of X was completely dissolved in the right arm of the tube, the level of X(aq) solution has risen as shown in figure II. (Only water can pass through the membrane.)
Which of the following X would give the SECOND greatest h?
(A) MgSO4
(B) CH3COOH
(C) CaCl2
(D) Sugar
10. Rubber balloons X and Y were inflated with either pure H2 or pure Ne gas to the same volume of 10 L. After being left in air for 1 h, the balloons shrank such that balloon X had a larger volume than Y. (Assume that the ambient temperature and pressure were kept constant between t = 0 and t = 1 h.)
Which of the following options from A to D chooses all the correct statement(s) from the box below?
1. At t = 0 h, balloon X contained Ne.
2. Internal pressure of balloon X was constant throughout the above change.
3. At t = 1 h, balloon Y contained a mixture of gases.