Chemistry Entrance Exam Questions

1. Which of the following is incorrect about SI units?
(a) Energy in joule (b) Force in Newtons
(c) Pressure in Pascals (d) Amount of substance in mol L'
2. Planck's constant has the dimensions of:
(a) force (b) work
(c) angular momentum (d) torque
3. The most abundant element in the earth's crust is:
4. An example of a homogeneous mixture is:
(a) Aluminium (b) Iron (c) Oxygen (d) Nitrogen
(a) mud (b) sand and water
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(c) sand and iron filing (d) brass
A mixture of sand and naphthalene can be separated by:
( a) fractional crystallisation (b) chromatography
(c) gravity separation (d) sublimation
N i trogen forms five stable oxides with oxygen of the formula, N20, NO, N20 , N204, N205. The formation of these oxides explains fully the:
(a) Law of definite proportions (b) Law of partial pressures
(c) Law of multiple proportions (d) Law of reciprocal proportions
1. Two metallic oxides contain 27.6% and 30.0% oxygen respectively. I 1- the formula of the first oxide is M304 , that of the second will be: (a) MO (b) MO2 (c) M205 (d) M203
X. One mole of oxygen gas is the volume of:
(a) 1 litre of oxygen at STP (b) 32 litres of oxygen at STP
(c) 22.4 litres of oxygen at STP (d) 6.02 x1023 molecules of oxygen . The number of molecules present in a drop of water weighing 0.06g is approximately:
(a) 1021 (b) 2 x102' (c) 3 x 1021 (c) 4 x 1021
10. The total number of electrons present in 1 mole of CO2:
(a) 6.023 x1023 (b) 12 x 6.023 x1023
(c) 22 x 6.023 x1023 (d) 24 x 6.023 x1023
1. Which pair of species have same percentage of carbon?
(a) CH3COOH and C6E11206 (b) CH3COOH and C2H5OH
(c) HCOOCH3 and C12H22011• (d) C6111206 and Ci2H22011
12. The sulphate of an element contains 42.2% element. The equivalent weight would be:
(a) 17.5
(b) 35.0 (c) 60.0 (d) 68.0
1 1. 11* energy is doubled, the wavelength of light radiation will be
( i) W oubled (b) Halved (c) Same (d) None of these
14. If r is the radius of first Bohr orbit of H-atom, then for Li2+ ion,
radius will be:
(a) 3r (b) 9r (c) r/3 (d) r/9

15. The number of d-electrons in Cr (atomic no. = 24) is equal to that of
(a) p-electrons in Al (Z = 13)
(b) p-electrons in K (Z = 19)
(c) d-electrons in Fe2+ (Z = 26)
(d) 3p -electrons in Cl (Z = 17)
16. The radiations from a naturally occurring radioactive substance. as
seen after deflection by a magnetic field in one direction are
(a) Definitely a - rays (b) Definitely -rays
(c) Both a and 3 -rays (d) Either a or 13 -rays
' 17. Elements up to atomic number 103 have been synthesized and stud- ied. If a newly discovered element is found to have an atomic number 106, its electronic configuration will be:
(a) [Rn]5p4, 6d4, 7s2 (b) [Rn]5f14, 6d1, 7s2 7p3
(e) [Rni5f'4, 6d6, 7s° (d) fRni5P4, 6d5, 7s'
18. Zero angular momentum relates to
(a) p orbital (b) s orbital (c) d orbital (d) f orbital
19. Which of the following elements possesses non-spherical outer most orbital?
(a) Li (b) B (c) Be (d) He
20. Cathode rays have:
(a) mass only (b) Charge only
(c) No mass, no charge (d) Mass and charge both
21. Rutherford's scattering experiments led to the discovery of
(a) nucleus
(b) presence of neutrons in the nucleus
(c) both (a) and (b)
(d) revolving nature of electrons around the nucleus
22. Which property of the element is whole number?
(a) Atomic mass (b) Mass number
(c) Atomic size (d) Ionisation potential
23. An isotone of 32Ge76 is:
(a) 32Ge" (b)3,As" (c) 34Se" (d) 3,1(el
Supplement
(a) A!3 (b) C (c) 02--
The coloured radiation with lowest energy is:
(a ) Red (b) Blue (c) Green (d) Yellow
'ft I hydrogen spectrum, the series of lines appearing in ultra violet region of electromagnetic spectrum are called :
(:1) I ,y man lines (b) Balmer lines
(c) P fund lines (d) Brackett lines
The wavelength of spectral line for an electronic transition is inversely related to
(a) the number of electrons undergoing transition
(h) the nuclear charge of the atom
(c) the difference in the energy levels involved in the transition
(d) the velocity of electron undergoing transition
28. The energy of an electron in an atomic orbit of hydrogen like spe- cies depends on:
(a) the principal quantum number only
(h) theprincipal and azimuthal quantum numbers only
(c) the principal, azimuthal and magnetic quantum numbers only
(d) the principal, azimuthal, magnetic and spin quantum numbers
29. The splitting of the spectral lines under the influence of magnetic field is called:
(a) Zeeman effect (b) Compton effect
(c) Photoelectric effect (d) Diffraction
When applied, the uncertainty principle has significance in case of
(a) moving train (b) spinning cricket ball
(c) moving a - particle (d) all the above
31. The principal quantum number n describes:
(b) Sub-shell of electron
(a) Shape of orbital
(d) Spin of electron
(c) Main energy shell of electron
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Which of the following has more electrons than neutrons?
(d) F