XI-FIRST THREE CHAPTER TEST-CBSE CHEMISTRY

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Q 1:  The largest number of molecules is in:
a. 28 g of CO                       b. 46 g of C2H5OH
c. 36 g of H2O                     d. 54 g of N­2O5                         
Q 2: The number of molecules in 89.6 litre of a gas at NTP are:
a. 6.02 × 1023                      b. 2 × 6.02 × 1023
c. 3 × 6.02 × 1023 d. 4 × 6.02 × 1023
Q 3: The total number of protons in 10 g of calcium carbonate is:
a. 3.0115 × 1024                  b. 1.5057 × 1024
c. 2.0478 × 1024                  d. 4.0956 × 1024
Q 4: What is equivalent weight of NaCl?
a. 58.5                                  b. 12.12
c. 13.45                                d. 65.42

Q 5: Why Bohr’s orbits are called stationary states?
Q 6: Explain why the electronic configuration of Cu is 3d104s1 and not 3d94s2.
Q 7: Calculate ionization potential in volts of (a) He+ and (b) Li2+ 
Q 8: Calculate the ratio of K.E and P.E of an electron in an orbit?
Q 9: How many spectral lines are emitted by atomic hydrogen excited to  nth energy level?
Q 10: Compare the wavelengths for the first three lines in the Balmer series with those which arise from similar transition in Be3+ ion. (Neglect reduced mass effect).
Q 11: Calculate the accelerating potential that must be applied to a proton beam to give it an effective wavelength of 0.005 nm.
Q 12: How many spectral lines are emitted by atomic hydrogen excited to  nth energy level?
Q 13: Calculate the mass of (i) an atom of silver (ii) a molecule of carbon dioxide.
Q 14:  Calculate the number of molecules present
(i)In 34.20 grams of cane sugar (C12H22O11)
(ii)In one litre of water assuming that the density of water is 1 g/cm3
(iii) In one drop of water having mass 0.05 g.
Q15 : Find out total number of protons in 10 g of calcium carbonate.
Q 16.Find the number of milli equivalents of H2SO4 present in 10 mL of N/2 H2SO4 solution.
Q 17. Calculate the total number of electrons present in 1.6 g of methane. 1M
Q 18. How is empirical formula related to its molecular formula ? 1M
Q 19. What is the mass in grams of one molecule of caffeine (C8H10N4O2) ? 1M
Q 20. Explain precision and accuracy with suitable examples. 2M
Q 21. Carbon and oxygen are known to form two compounds. The carbon content in  one of these is 42.9% while in the other it is 27.3%. Show that this data is in agreement with the law of multiple proportions
 
Q. 23. Name the elements in period 1.
Q. 24. What happens to atomic size of elements on moving from left to right in a period?
Q. 25. If an element is in Group 7 [or Group 7 A] is it likely to be metallic or non-metallic character.
Q. 26. What is the name given to the energy released when an atom in its isolated gaseous state accepts an electron to form an anion.
Q. 27. Fill in the blanks : The atomic size _________ as we move from left to right across the period, because the _________ increases but the _________ remains the same.
Q. 28. Predict the group of an element X if its atomic number is 16.

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