Which of the following statements is not true, with respect to 'Laterite soils' in India?

Which of the following statements regarding laterite soils of India is correct?

Which one among the following statements with reference to the black cotton soils of India is NOT correct?

Which of the following statements regarding soil is NOT correct?

In alkaline soils, which of the following is not present in soluble state?

Which one of the following is found in appreciable amount in Laterite soil in India?