An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?
Base | Acid | End Point |
Strong | Strong | Pink to colourless |
Base | Acid | End Point |
Weak | Strong | Colourless to pink |
Base | Acid | End Point |
Strong | Strong | Pinkish Red to Yellow |
Base | Acid | End Point |
Weak | Strong | Yellow to Pinkish Red |
Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction?
A and D
A and B
B and C
C and D
The combustion of benzene (l) gives CO2(g) and H2O(l). Given that heat of combustion of benzene at constant volume is –3263.9 kJ mol–1 at 250C; the heat of combustion (in kJ mol–1) of benzene at constant pressure will be (R = 8.314 JK–1 mol–1)
–3267.6
4152.6
–452.46
3260
The ratio of mass percent of C and H of an organic compound (CXHYOZ) is 6: 1. If one molecule of the above compound (CXHYOZ) contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O. The empirical formula of compound CXHYOZ is
C2H4O3
C3H6O3
C2H4O
C3H4O2
Which of the following are Lewis acids?
BCl3 and AlCl3
PH3 and BCl3
AlCl3 and SiCl4
PH3 and SiCl4
According to molecular orbital theory, which of the following will not be a viable molecule?
A.
Species | Bond Order |
1/2[2-2] = 0 (does not exist) | |
1/2[2-0] = 1 (Exist) | |
1/2 [2-1] = 0.5 (Exist) | |
1/2 [ 2-1] = 0.5 (Exist) |
Which of the following compounds contain(s) no covalent bond(s)?
KCl, PH3, O2, B2H6, H2SO4
KCl, B2H6
KCl, B2H6, PH3
KCl, H2SO4
KCl
Hydrogen peroxide oxidises in acidic medium but reduces in alkaline medium. The other products formed are, respectively
H2O and (H2O + OH-)
(H2O + O2) and H2O
(H2O + O2) and (H2O + OH-)
H2O and (H2O + O2)