Detergents are better than soaps for laundry because
- A. detergents are synthetic while soaps are not
- B. detergents are more soluble in water than soaps
- C. scum is precipitated when soaps are used with hard water but not with stergents
- D. soaps from soluble saits with ions causing hardness of water while detergents do not
- E. soaps are in bars while detergents are in powder form
A salt which loses mass when exposed to air is
- A. hygroscopic
- B. deliquescent
- C. efflorescent
- D. fluorescent
- E. effervescent
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
- A. CH2
- B. CH3
- C. C2H2
- D. C2H4
- E. C2H6
Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}
- A. 6.02 x 10 23
- B. 3.01 x 1022
- C. 6.02 x 1022
- D. 5. 08 x 1022
- E. 3.01 x 1022
Which of the following does not affect the rate of a chemical reaction?
- A. Addition or presence of a catalyst
- B. Size of the reacting particles
- C. The enthalpy change for the reaction
- D. Concentration of the reactants
- E. Temperatureat which the reaction is carried out
Which of the following does not affect the rate of a chemical reaction?
- A. Addition or presence of a catalyst
- B. Size of the reacting particles
- C. The enthalpy change for the reaction
- D. Concentration of the reactants
- E. Temperatureat which the reaction is carried out
Which of the following compound is aromatic?
- A. Benzene
- B. Cyclobutane
- C. Cyclopentane
- D. Hexane
- E. Ethene
The reaction represented by the equation NaOH(aq) + HCI(aq) → NaCI(aq) + H2O(/)
- A. is a double decomposition
- B. is a neutralization
- C. is reversible
- D. is usually catalysed
- E. attains equilibrium after a few seconds
The following are uses of sulphur except
- A. manufacture of tetraoxosulphate (VI) acid
- B. prevention of the growth of fungi
- C. vulcanization rubber
- D. manufacture of dyes
- E. coating of steel to prevent rusting
An acid present in proteins is
- A. lactic acid
- B. amino acid
- C. propanoic acid
- D. palmitic acid
- E. stearic acid
Equilibrium is said to be attained in reversible reaction when
- A. all the reactants have been used up
- B. all the products have been formed
- C. there is no further change in temperature
- D. the rates of the forward and backward reactions are equal
- E. the rate of formation of the products decreases with time