Chemistry Past Questions And Answers
Which of the following equimolar solutions, Na2CO3 Na2 SO 4CI FeCI3 CH3COONa, have pH greater than 7?
- A. FeCI 3 and NH 4CI
- B. Na2CO3, CH3COONa and Na,Na2SO4
- C. Na2CO3 and CH3COONa
- D. FeCI3, CH3COONa and NH4CI
Which of the following pairs of salts undergo hydrolysis?
- A. AlCI3 and NH4CI
- B. AICI3 and NaCI
- C. FeCI3 and KCI
- D. Na2SO4 and K2SO4
Vinegar is an aqueous solution of?
- A. Hydrochloric acid
- B. ethanedioc acid
- C. ethanoic acid
- D. hydrofluoric acid
Pauli exclusion principle is related to
- A) quantum numbers of electrons
- B) reversibility of equilibrium reactions
- C) electronegativity values of elements
- D) collision theory of reactions rate
A gas that turns a filter paper previously soaked in lead ethanoate solution black is?
- A. hyrogen chloride
- B. hydrogen sulphide
- C. sulphur (IV) oxide
- D. sulphur (VI) oxide
This type of bonding involves overlapping of orbitals during which electrons are shared
- A) hydrogen bonding
- B) covalent bonding
- C) ionic bonding
- D) metallic bonding
What is the change in the oxidation number of1- in the reaction represented by the following equation? 5I-1(aq) + 6H-(aq) + 1O-3(aq) → 3I2(g) + 3H2O(l)
- A. -5 to -3
- B. -1 to 0
- C. + 5 to + 0
- D. -1 to + 2
The carbon atoms of ethane are
- A) sp2 hybridized
- B) sp3 hybridized
- C) sp2d hybridized
- D) sp hybridized
The properties of a good primary standard solution include the following except?
- A. High molecular mass
- B. low molecular mass
- C. high degree of purity
- D. readily available
A feasible cell was constructed by joining the two half cells below. Cu2+ (aq) + 2e- → Cu(s) Eo = - 0.76 V. What is the standard e.m.f. of the cell?
- A. - 1.1V
- B. - 0.42V
- C. +0.42V
- D. +1.1V