Deep blue CusO4·5H2O is converted to a bluish white salt at 100°C. At 250°C and 750°C it is then transformed to a white powder and black material respectively. Identify the salts.
A 100 mL 0.1 = (M) solution of ammonium acetate is diluted by adding 100 mL of water. The pH of the resulting solution will be (pKa of acetic acid is nearly equal to pKb of NH4OH).
4.9
5.0
7.0
10.0
In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will
also be doubled
be halved
remains the same
becomes one-fourth
The pH of an aqueous solution of CH3COONa of concentration C(M) is given by
7 - pKa - log C
pKw + pKb + log C
pKw - pKb - log C
pKw + pKa + log C
If the equilibrium constants of the following equilibria,
SO2 + O2 → SO3 and 2SO3 → 2SO2 + O2
are given by K1 and K2 respectively, which of the following realation is correct?
K2 =
K1 =
K2 =
K2 = (K1)2
20 mL 0.1 (N) acetic acid is mixed with 10 mL 0.1(N) solution of NaOH. The pH of the resulting solution is (pKa of acetic acid is 4.74)
3.74
4.74
5.74
6.74
Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl?
MnO2
H2S
KMnO4
Cr2O3
A compound on burning in air produces three oxides. Out of these one oxide turns lime water milky, the second one turned anhydrous CuSO4 blue and third forms a solution of pH = 9. The compound is made up of
S, N and H
S, H and Na
S and N
S, C and H