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6.

How many litres of water must be added to 1L  of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?


A) 0.1 L

B) 0.9 L

C) 2.0 L

D) 9.0 L



7.

Four successive members of the first-row transition elements listed below with atomic numbers. Which one of them is expected to have highest 

 $E^{0}_{M^{3+}/M^{2+}}$ value ?


A) Cr (Z=24)

B) Mn (Z=25)

C) Fe (Z=26)

D) Co (Z=27)



8.

Energy of an electron is given by

   $E=-2.178 \times 10^{-18}J \left(\frac{Z^{2}}{n^{2}}\right)$

 Wavelength of light requires to excite an electron in an hydrogen atom from level n=1 to n=2 will  be (h= 6.62 x 10-34 J s and c=3.0 x 108 ms-1)


A) $1.214 \times 10^{-7}m$

B) $2.816 \times 10^{-7}m$

C) $6.500 \times 10^{-7}m$

D) $8.500 \times 10^{-7}m$



9.

Which of the following represents the correct order of increasing the first ionisation enthalpy for Ca, Ba, S, Se and Ar  ?


A) $Ca\lt S \lt Ba \lt Se \lt Ar$

B) $S\lt Se \lt Ba \lt Ca \lt Ar$

C) $Ba\lt Ca \lt Se \lt S \lt Ar$

D) $Ca\lt Se \lt Ba \lt S \lt Ar$



10.

The coagulating power of electrolytes having  ions Na+, Al3+   and Ba2+  for arsenic  sulphide  sol increases in the order

 


A) $Al^{3+}$ < $Ba^{2+}$ < $Na^{+}$

B) $Na^{+}$ < $Ba^{2+}$ < $Al^{3+}$

C) $Ba^{2+}$ < $Na.^{2+}$ < $Al^{3+}$

D) $Al^{3+}$ < $Na^{+}$ < $Ba^{2+}$



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