When air is passed through alkaline pyrogallol and then lime water, the gases left are
- A. nitrogen and carbon (IV) oxide
- B. nitrogen and noble gases
- C. nitrogen and oxygen
- D. nitrogen, carbon (VI) oxide and noble gases
- E. the noble gases
A salt which loses its mass when exposed to air is
- A. deliquescent
- B. effervescent
- C. Efflorescent
- D. fluorescent
- E. hygroscopic
Atomic size decreases
- A. across a period from left to right
- B. across a period from right to left
- C. diagonally down the group
- D. down a group
- E. with decrease in atomic number
Sulphur has an oxidation number of +4 in
- A. H2S
- B. H2S04
- C. MgSO4
- D. Na2SO3
- E. S03
If the volume of a gas at 35°C is 60cm3, what would be its volume in cm3 at 273k?
- A. 39.03
- B. 46.81
- C. 53.18
- D. 67.69
- E. 76.92
C\(_6\)H\(_{12}\)O\(_6\)
What is the molar mass of the compound above?
[ H=1, C=12, O=16 }
- A. 45
- B. 61
- C. 180
- D. 123
- E. 244
In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are
- A. hydrogen, oxygen
- B. Hydrogen, tetraoxosulphate (VI) ion
- C. oxygen, hydrogen
- D. sulphur, hydrogen
- E. sulphur, oxygen
A neon atom is chemically nonreactive because
- A. the electrons at the outermost shell is partially filled
- B. the number of protons equals the number of electrons
- C. the outer electron shell is completely filled
- D. there are equal number of protons and neutrons in its nucleus
- E. there are no elections at the outermost shell
\( ^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy \)
The equation above represent a/an
- A. alpha particle emission
- B. endothermic reaction
- C. nuclear fission
- D. nuclear fusion
- E. thermal dissociation
Which of these compounds has the greatest ionic character?
- A. AlF3
- B. BF2
- C. CF4
- D. CsF
- E. NaF
What kind of bond exist between carbon and oxygen in C03 2-?
- A. Co- ordinate Covalent
- B. covalent
- C. Electrovalent
- D. Metallic
- E. Van der Waal forces
Which of the following gases will bleach moist litmus paper?
- A. Cl2
- B. CO2
- C. HCl
- D. N2O
- E. SO3
Which of the following compounds will undergo thermal dissociation?
- A. AgCl
- B. CaCO3
- C. K2S04
- D. NaOH
- E. NH4CI
The rate of a reaction usually increases with increase in the concentration of reactants because the
- A. distance between particles of the reactants increases
- B. frequency of collision of particles is lower
- C. particles of the reactants gain energy and move faster
- D. reactants from a complex which decomposes rapidly
- E. reactants occupy a higher energy level
The reaction of an alkanol with alkanioc acid is known as
- A. dehydration
- B. esterification
- C. halogenation
- D. hydrogenation
- E. saponification
The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is
- A. CH2
- B. CH3
- C. C2H2
- D. C2H4
- E. C2H6
Which of the following statements is NOT correct of group VII elements? They
- A. are diatomic
- B. are good oxidizing agents
- C. are highly electronegative
- D. have high electron affinity
- E. have relatively low ionization potentials
Which of the following is NOT a fraction of petroleum?
- A. Bitumen
- B. Coal
- C. Diesel
- D. Kerosene
- E. Petrol
The scientist who discovered the zig-zag movement of gas molecules is
- A. Brownian
- B. Dalton
- C. Gay Lussac
- D. Graham
- E. Newton
The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT
- A. HOCH2 – CH2OH
- B. H2C –C =C– CH3
- C. H3C – HC = CH2
- D. H2C = CH2
- E. H3C – C =CH
The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]
- A. CH
- B. CH3
- C. CH4
- D. C2H2
- E. C2H6