A: Number of ions in 9 gram of NH_(4)^(+) is equal to Avogadro's number ( N_(A) ). R: Number of ions is equal to number of atoms.
Which of the following are true for an element ? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic number = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons
There are 45 persons working in an office. If the number offemales is 25 and the remaining are males, find the ratio of :(a) The number of females to number of males.(b) The number of males to number of females.
What is the percentage of carbon in pig iron and cast iron ?
What is the percentage of carbon in pig iron and cast iron?
Which one of the following is the major impurity in pig iron?
which of the following electronts is present as the impurity to the maximum extent in the pig iron?
is the amount of carbon in pig iron/cast iron more than, less than or the same as the amount of carbon is steel? (not in syllabus)
Describle the principal controlling each of the following processes: (i) Preparation of cast iron from pig iron. (ii) Preparation of pure alumina (Al_(2)O_(3)) form bauxite ore.
DINESH PUBLICATION ENGLISH-GROWTH, REPAIR, REGENERATION AND AGEING-Brain Teasers-VI[B]
