Calculate the pH of 0.05 moldm\(^{-3}\) H\(_2\)SO\(_4\)
1.30
1.12
1.00
0.30
Correct answer is C
Recall from pH formula pH = -Log [H+]
H2SO4 → 2H+ + SO42-
2H+ → 2 X0.05 = 0.1
pH= -Log [0.1] = 1
7.64g
3.82g
1.91g
0.96g
Correct answer is C
M = \(\frac{MmIT}{96500n}\)
Where
M=mass
Mm = Molar mass = 64g/mol
I = current = 1.6A
T= Time =1h r=3600s
N= No of Charge = +2
M = \(\frac{64x \times 1.6 \times 3600}{96500 \times 2}\)
M=1.91g
The solubility of the solids that dissolves in a given solvent with the liberation of heat will
increase with an increase in temperature
decrease with an increase in temperature
decrease with a decrease in temperature
not be affected by changes in temperature
Correct answer is B
Increasing temperature in exothermic reaction favors the left/reactant side and decreasing temperature will favor the right/product side.
Diamond is a bad conductor of electricity because its bonding electrons are used in
crystal lattice formation
covalent bond formation
metallic bond formation
coordinate bond formation
Correct answer is B
Diamond is a covalent macromolecule, and typical of a covalent substance is an insulator. All valence electrons are localized in well-defined covalent bonds and hence are not free to move through the structure
450cm\(^3\)
300cm\(^3\)
200cm\(^3\)
150cm\(^3\)
Correct answer is A
From the dilution law
C\(_1\)V\(_1\) = C\(_2\)V\(_2\)
C\(_1\) = Initial Concentration of NaOH = 0.6M
V\(_1\) = Initial Volume of NaOH = 300cm3
C\(_2\) = Final Concentration of NaOH = 0.4M
V\(_2\) = Final Volume of NaOH = ?
V\(_2\) = \(\frac{C_1V_1}{C_2}\)
V\(_2\) = \(\frac{0.6 \times 300}{0.4}\)
V\(_2\) = 450 cm\(^3\)
Correct Computation as it follows the equation specified