The concentration of Fe2+ ions in a solution can be determined by titration with acidifed potassium manganate(VII) solution.The ionic equation for the reaction is:5Fe2+ + MnO4– + 8H+ → 5Fe3+…
A pea plant is heterozygous for seed colour and homozygous for seed shape. Yellow seed colour (Y) is dominant to green seed colour (y). Round seed shape (R) is dominant…
One side of a rectangle is − cm.The rectangle has an area of 66 cm2.What is the perimeter, in cm, of the rectangle? Answer: 16) D Area of a rectangle…
Which statement about waves is correct? Answer: 15) F The only correct statement is F. Ultrasonic waves, like sound waves, are longitudinal.
The decomposition of hydrogen peroxide in the presence of a manganese(IV) oxide catalyst produces water and oxygen gas.2H2O2(aq) → 2H2O(l) + O2(g)0.2 g of manganese(IV) oxide granules are added to…
Which of the following is/are included in the carbon cycle?1 amino acids in an animal2 cellulose in a plant cell wall3 lipids in a bacterial cell membrane Answer: 13) H…
Point M has coordinates (6, 3p −1) and point N has coordinates (1− p, 2). The gradient of the straight line joining M and N is − 3 and it…
A large metal sphere mounted on an insulating stand is negatively charged. A smaller, uncharged metal sphere mounted on an insulating stand is placed near to the negatively charged sphere.…
Consider the non-radioactive elements in Group 1.Which of the following statements is/are correct about the element with the largest atomic number?1 It has the most vigorous reaction with cold water.2…
A lizard was placed in a chamber with a constant flow of air. The temperature of the chamberwas varied between 25 °C and 10 °C. Apart from temperature and time,…