Chemistry
CHEMISTRY Guess Paper – 2013
Class – XI
Subject - CHEMISTRY MAX MARKS=90
………………………………………………………………………………………
General instructions:
All questions are compulsory.
Marks for each question are indicated against it.
Questions number 1to 8 are very short –answer questions, carrying 1 mark each. Answer these in one word or about one sentence each.
Questions number 9 to18 are short –answer questions, carrying 2 marks each. Answer these in about 30 words each.
Questions number19 to27 are short –answer questions, carrying 3 marks each. Answer these in about 40 words each.
Questions number28 to30 are long-answer questions of 5 marks each. Answer these in about 70 words each. 7 Use log tables if necessary. Use of calculators is not permitted
QUESTIONS:
1.Define molality. (1) 2.Calculate the number of lines when an electron jumps from 6th level to 2nd level. (1) 3. If two discharge tubes A and B are filled with Hydrogen and oxygen respectively, will the electrons and gaseous cations be the same? Justify your answer. (1) 4. Which of the two is paramagnetic:V+4 or V+5 and why? (1)
5 How cathode rays are originated in the discharge tube and how their origin differs from the origin of anode rays?
6 When is a cation highly polarizing? Which alkali metal has the highest polarizing power? (1)
7.Why is KO2 paramagnetic? (1)
8 Potassium and Caesium are used in photoelectric cells. Why? (1)
9 Concentrated sulphuric acid is 98% H2SO4
Class – XI
Subject - CHEMISTRY MAX MARKS=90
………………………………………………………………………………………
General instructions:
All questions are compulsory.
Marks for each question are indicated against it.
Questions number 1to 8 are very short –answer questions, carrying 1 mark each. Answer these in one word or about one sentence each.
Questions number 9 to18 are short –answer questions, carrying 2 marks each. Answer these in about 30 words each.
Questions number19 to27 are short –answer questions, carrying 3 marks each. Answer these in about 40 words each.
Questions number28 to30 are long-answer questions of 5 marks each. Answer these in about 70 words each. 7 Use log tables if necessary. Use of calculators is not permitted
QUESTIONS:
1.Define molality. (1) 2.Calculate the number of lines when an electron jumps from 6th level to 2nd level. (1) 3. If two discharge tubes A and B are filled with Hydrogen and oxygen respectively, will the electrons and gaseous cations be the same? Justify your answer. (1) 4. Which of the two is paramagnetic:V+4 or V+5 and why? (1)
5 How cathode rays are originated in the discharge tube and how their origin differs from the origin of anode rays?
6 When is a cation highly polarizing? Which alkali metal has the highest polarizing power? (1)
7.Why is KO2 paramagnetic? (1)
8 Potassium and Caesium are used in photoelectric cells. Why? (1)
9 Concentrated sulphuric acid is 98% H2SO4