(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively.
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition.
(b) The experiment did not say anything about the charge of electrons, the neutrons were not discovered by that time. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
(b) The experiment did not say anything about the charge of electrons, the neutrons were not discovered by that time.
Valencies of aluminium and phosphate are
(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(a) Aluminium and phosphate ions are represented as Al³+ and PO₄³⁻ respectively.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
See lessTwo chemical species X and Y combine together to form a product P which contains both X and Y X + Y → P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning the species X, Y and P correct? (i) P is a compound. (ii) X and Y are compounds. (iii) X and Y are elements. (iv) P has a fixed composition.
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See lessWhich of the following statements about Rutherford’s model of atom are correct? (i) Considered the nucleus as positively charged. (ii) Established that the a-particles are four times as heavy as a hydrogen atom. (iii) Can be compared to solar system. (iv) Was in agreement with Thomson’s model.
(d) Rutherford model only established that the nucleus is positively charged. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
(d) Rutherford model only established that the nucleus is positively charged.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
See lessThe electron distribution in an aluminium atom is
(a) The electron distribution in an aluminium atom is 2, 8, 3. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
(a) The electron distribution in an aluminium atom is 2, 8, 3.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
See lessRutherford’s a-particle scattering experiment showed that (i) electrons have negative charge. (ii) the mass and positive charge of the atom is concentrated in the nucleus. (iii) neutron exists in the nucleus. (iv) most of the space in an atom is empty. Which of the above statements are correct?
(b) The experiment did not say anything about the charge of electrons, the neutrons were not discovered by that time. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
(b) The experiment did not say anything about the charge of electrons, the neutrons were not discovered by that time.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-4/
See less