When protein is heated to a high temperature it undergoes
- A. condensation
- B. denaturation
- C. hydrolysis
- D. polymerization
The product of the reaction between C 2H5OH and concentrated H2SO 4 at 170oC is
- A. (C2H5)2SO4
- B. CH 3CH 2HSO 4
- C. (C2H5)2O
- D. CH2 = CH 2
Which of the following raw materials is used in the plastic industry ?
- A. Calcium
- B. Ethene
- C. Hydrogen
- D. Methane
The separation of petroleum fractions depends on the differences in their
- A. boiling points
- B. molar masses
- C. melting point
- D. solubilities
Which of the following oxides of nitrogen has oxidation number of + 1?
- A. KNO3
- B. N2O
- C. N2O3
- D. NO
Consider the reaction represented by the equation: 2H2SO 4(aq0 + C(s) → 2H2O(l) + 2SO2(g) + CO 2(g) H2SO 4 is acting as
- A. a catalyst
- B. an oxidizing agent
- C. a reducing agent
- D. a sulphonating agent
Which of the following substances is the anode in the dry Leclanche cell ?
- A. Carbon rod
- B. Muslin bag
- C. The seal
- D. Zinc container
Which of the following factors will affect the rate of the reaction represented by the equation? 2HCI(aq) + CaCO 3(s) → CaCI2(aq) + H2O (I) + CO2(g) l. Pressure ll. Concentration III. Nature of reactants IV. Temperature
- A. l and ll only
- B. ll, lll and IV only
- C. l, ll and lll only
- D. l, ll, lll and IV
A catalyst increases the rate of chemical reaction by
- A. decreasing the temperature of the reaction
- B. decreasing the activation energy of the reaction
- C. increasing the surface area of the reactants
- D. decreasing the surface area of the products
Which of the following statement is correct? The solubility of
- A. gases increases with increase in temperature
- B. gases decreases with increase in temperature
- C. most solid solutes decreases with indease in temperature
- D. most solid solutes is constant
Which of the following salts is insoluble in water?
- A. Pb (NO3)2
- B. Na 2CO3
- C. AgNO3
- D. AgCI.
A solution that contains as much solute as it can dissolve at a given temperature is said to be
- A. concentrated
- B. saturated
- C. supersaturated
- D. unsaturated
Which of the following acids from normal salt only?
- A. Tetraoxosulphate (IV) acid
- B. Tetraoxophosphate (V) acid
- C. Trioxonitrate (V) acid
- D. Trioxosulphate (IV) acid
Which of the following hydroxides will readily dissolved in water?
- A. Cu(OH)2
- B. NaOH
- C. Pb(OH)2
- D. Zn(OH)2
Which of the following compounds is not a double salt?
- A. Zn(OH)NO3
- B. KAI(SO4)2
- C. KCr(SO4)2
- D. (NH4)2Fe(SO4)2
Which of the following dilute acids does not react with metals to liberate hydrogen?
- A. CH3COOH(aq)
- B. HCI(aq)
- C. H2SO4(aq)
- D. HNO3(aq)
Salts that contain water of crystallization are said to be
- A. anhydrous
- B. deliquescent
- C. efflorescent
- D. hydrated
Consider the reaction represented by the following equation: H 2(g) + \(\frac{1}{2}\) O(g) → H 2O(g) ∆H =-285.8 KJmo -1 ∆H represents the enthalpy of
- A. formation
- B. hydration
- C. neutralization
- D. solution
In a chemical reaction, ∆H is positive when
- A. H (product) >H (reactant)
- B. H(product) < H (reactant)
- C. H (product) = H (reactant)
- D. H (product) = Zero (reactant)
In a mixture of gases which do not react chemically together, the pressure exerted by the individual gases is called
- A. atmospheric pressure
- B. partial pressure
- C. total pressure
- D. vapour pressure
Which of the following expressions correctly represents Charles’ law?
- A. PV = K
- B. R \(\alpha \frac{1}{\sqrt{p}\)
- C. PV = RT
- D. V = KT