NAT IIB Biological Science Chemistry Preparation Online Test for Pakistani Students

NAT II Biological Science Chemistry

Sr. #	Questions	Answers Choice
1	If N_Ais Avogadro's number, then number of valence electrons in 4.2 g of nitride ions N^3-is	2.4 N<sub>A</sub> 4.2 N<sub>A</sub> 1.6 N<sub>A</sub> 3.2 N<sub>A</sub>
2	2 g of oxygen contains number of atoms equal to that in	0.5 g of hydrogen 4 g of sulphur 7 g of nitrogen 2.3 g of sodium
3	The total number of protons in 10 g of calcium carbonate is (N₀= 6.023 x 10²³)	1.5057 x 10<sup>24</sup> 2.0478 x 10<sup>24</sup> 3.0115 x 10<sup>24</sup> 4.0956 x 10<sup>24</sup>
4	The number of oxygen atoms in 4.4 g of CO₂is approximately	1.2 x 10<sup>23</sup> 6 x 10<sup>22</sup> 6 x 10<sup>23</sup> 12 x 10<sup>23</sup>
5	The number of atoms contained in 11.2 L of SO₂at S.T.P are	3/2 x 6.02 x 10<sup>23</sup> 2 x 6.02 x 10<sup>23</sup> 6.02 x 10<sup>23</sup> 4 x 6.02 x 10<sup>23</sup>
6	How many moles of Helium gas occupy 22.4 L at 0°C at a atm. Pressure?	0.11 0.90 1.0 1.11
7	1 mole of CH₄contains	6.02 x 10<sup>23</sup>atoms of H 4 g-atom of hydrogen 1.81 x 10<sup>23</sup>molecules of CH<sub>4</sub> 3.0 g of carbon
8	Which of the following has least mass?	2 gram atom of nitrogen 3 x 10<sup>23</sup>atoms of C 1 mole of S 7.0 g of Ag.
9	What quantity of limestone (CaCO₃) on heating will give 56 kg of CaO?	1000 kg 56 kg 44 kg 100 kg
10	The percentage of oxygen in NaOH is	40 60 8 10