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1
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+1
-0.25
Identify the correct order of acidic strengths of CO2, CuO, CaO, H2O
A
CaO < CuO < H2O < CO2
B
H2O < CuO < CaO < CO2
C
CaO < H2O < CuO < CO2
D
H2O < CO2 < CaO < CuO
2
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+1
-0.25
Rutherford's experiment, which established the nuclear model of the atom, used a beam of
A
$$\beta-particles$$, which impinged on a metal foil and got absorbed
B
$$\gamma-particles$$, which impinged on a metal foil and ejected electrons
C
helium atoms, which impinged on a metal foil and got scattered
D
helium nuclei, which impinged on a metal foil and got scattered
3
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+2
-0.5
If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration 1s22s22p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed because it violates
A
Heisenberg uncertainty principle
B
Hund's rule
C
Pauli exclusion principle
D
Bohr postulate of stationary orbits
4
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+2
-0.5
How many moles of electron weigh one kilogram?
A
$$6.023 \times {10^{23}}$$
B
$${1 \over {9.108}} \times {10^{31}}$$
C
$${{6.023} \over {9.108}} \times {10^{54}}$$
D
$${1 \over {9.108 \times 6.023}} \times {10^8}$$

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