Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?
- A. Lead
- B. Copper
- C. Iron
- D. Calcium
- E. Aluminium
Ammonia gas is suitable for performing the ‘Fountain’ experiment because the gas is
- A. colourless
- B. a cooling agent
- C. alkaline to litmus
- D. a reducing agent
- E. very soluble in water
Nitrogen is prepared on a large scale by the
- A. fractional distillation of liquefied air
- B. decomposition of ammonium dioxonitrate (lll)
- C. electrolysis of brine
- D. Haber process
- E. Contact process
What is the role of MnO2 in the reaction represented by the following equation?MnO2 + 4HCI2 + CI2 + 2H2O
- A. Bleaching agent
- B. Oxidizing agent
- C. Amphoteric oxide
- D. Basic oxide
- E. Catalyst
The cleansing action of soap in hard water is not satisfactory because soap
- A. forms insoluble calcium and magnesium salts
- B. is made from fats and oils
- C. has an organic component
- D. alters the surface tension of water
- E. is a sodium salt of higher carboxylic acids
During water treatment for town supply, water is passed through layers of send beds in order to
- A. soften the water
- B. filter the water
- C. decolorize the water
- D. destroy the germs in the water
- E. coagulate colloidal particles in the water
The component of air that can be removed by alkaline pyrogallol solution is
- A. oxygen
- B. nitrogen
- C. water vapour
- D. carbon (IV) oxide
- E. noble gases
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. What type of reaction was involved between compound X and concentrated hydrochloric acid?
- A. Polymerization
- B. Fermentation
- C. Hydrolysis
- D. Neutralization
- E. Esterification
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. Compound X was probably
- A. rubber
- B. polyethene
- C. nylon
- D. cellulose
- E. ethanol
Which of the following is a disaccharide?
- A. fructose
- B. starch
- C. cellulose
- D. sucrose
- E. glycogen
When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of
- A. calcium oxide
- B. calcium carbide
- C. calcium hydrogentrioxocarbonate (IV)
- D. trioxocarbonate (IV) acid
- E. calcium trioxocarbonate (IV)
What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?
- A. 1 mole
- B. 2 moles
- C. 3 moles
- D. 5 moles
- E. 6 moles
When acidified KMnO4 solution is decolorised by ethene, the gas acts as
- A. a straight-chain hydrocarbon
- B. a saturated hydrocarbon
- C. a reducing agent
- D. a dehydrating agent
- E. an oxidizing agent
On exposing palm wine to air for some days, it becomes sour owing to the conversion of
- A. glucose to ethanol
- B. glucose to gluconic acid
- C. ethanol to ethanoic acid
- D. ethanol to ethanal
- E. palm wine to palmitic acid
Which of the following exhibits resonance?
- A. Benzene
- B. Butane
- C. Pentene
- D. Octana
- E. Hexene
If the third member of a homologous series is C3H8, the fifth member will be
- A. C 5H8
- B. C5H9
- C. C5H10
- D. C5H11
- E. C5H12
What does X represent in the following equation? H 2(g) + 1/2O2(g) → H2O (l); ∆H = xKJ.
- A. Bond energy
- B. Activation energy
- C. Ionization energy
- D. Enthalpy of neutralization
- E. Enthalpy of formation
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
- A. cooling the reaction mixture
- B. using zinc powder instead of zinc granules
- C. using zinc rod instead of zinc granules
- D. carrying out the reaction at a higher pressure
- E. carrying out the reaction in a closed vessel
Which of the following is not correct about a catalyst? It
- A. remains unchanged chemically at the end of a reaction
- B. helps to establish equilibrium faster reversible reaction
- C. can start a chemical rection which will normally not take place
- D. is usually specific in its action
- E. alters the rate of chemical reaction
Which of the following statements is not correct about electrolysis?
- A. Reduction occurs at the anode
- B. Anions migrate to the anode
- C. Positive ions migrate to the cathode
- D. Concentration affects the discharge of ions
- E. Electrolytes conduct electric current
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
- A. NO 2
- B. N 2O
- C. NO
- D. HNO2
- E. HNO3