Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
- A. S decays faster than Q
- B. Q is twice as stable as S
- C. Q emits fewer particles than S
- D. S is more stable than Q
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
- A. 4f
- B. 4p
- C. 4d
- D. 4s
Pauli Exclusion Principle is related to
- A. quantum numbers of electrons
- B. reversiblility of equlibrium reactions
- C. electronegativity values of elements
- D. collision theory of reaction rates
What is the electronic configuration of an element represented as 199X?
- A. 1s 22s2 2p 5
- B. 1s22s23s23p3
- C. 1s2 2s2 2p 33s2
- D. 1s 22s22p 63s23p64s 1
Which of the following atoms contains the highest number of electrons in the outermost shell?
- A. 8O
- B. 10Ne
- C. 15P
- D. 19K
Which of the following compounds is used as a gaseous fuel?
- A. CH 3-COO-CH2-CH3
- B. CH 3-CH 2-CH 2-CH 3
- C. CHCI 3
- D. CH 3-CH2-COOH
- E. CH3-C=CH
A positive reaction to Fehling’s test indicates the presence of
- A. strach
- B. reducing sugars
- C. oxidizing agents
- D. alkanoic acids
- E. alkanols
The products of the reaction between CH3CH 2COOH and CH3OH are H 2
O and
- A. CH 3CH2COOCH3
- B. CH3CH 2COOCH 2CH 3
- C. CH3CH2CH2COOH
- D. CH3CH2CH2OH
- E. CH3COOH
When alkanols react with sodium, the ga evolved is
- A. hydrogen
- B. oxygen
- C. methane
- D. ethyne
- E. carbon (IV) oxide
Dehydration of ethanol produces
- A. ethanoic acid
- B. propan-1,2,3-triol
- C. ethene
- D. ethanal
- E. methanol
Petrol consists mainly of
- A. polymers
- B. alkanoates
- C. hydrocarbons
- D. alktanols
- E. alkenes
Which of the following alkanes has the highest boiling point?
- A. pentane
- B. ethane
- C. propane
- D. butana
- E. hexane
The liquid product of the destructive distillation of coal is
- A. kerosene
- B. ethanol
- C. ammoniacal liquor
- D. paraffin oil
- E. aqueous ammonia
Which of the following can undergo both addition reactions and substitution reactions?
- A. Benzene
- B. Pentane
- C. Propene
- D. Hexane
- E. Ethene
A device used in the laboratory for intermittent production of gases without heating is
- A. Leibing condenser
- B. aspirator
- C. delivery tube
- D. inverted funnel
- E. Kipp's apparatus
Metals are said to be malleable because they
- A. are good conductors heat
- B. are good conductors of electricity
- C. can be beaten into sheets
- D. can be alloyed
- E. can be polished
Aluminium is extracted from
- A. magnetite
- B. cryolite
- C. bauxite
- D. cassiterite
Rusting of iron is an example of
- A. deliquescence
- B. decomposition
- C. displacement reaction
- D. redox reaction
- E. reversible reaction
Two metallic ions commonly present in hard water are
- A. Ca2+ and Zn2+
- B. Cu2+ and Na+
- C. Mg2+ and Ca2+
- D. Fe2+ and Na+
- E. Zn2+ and Cu2+
The spontaneity of a chemical reaction is determined by the change in the
- A. concentration of the reactants
- B. temperature of the system
- C. free energy of the system
- D. pressure applied to the system
- E. volume of the reactants
Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl2(aq) + H2C2O 4(s) ⇌ CaC 2O2
- A. Calcium chloride solution
- B. Concentrated hydrochloric acid
- C. Ethanol
- D. Ethanedioc acid
- E. Aqueous ammonia