Description : Name the hydrogen ion which resembles anions of group 17.
Last Answer : A (H-) Hydride ion
Description : 17. When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid. A) True B) False
Last Answer : A
Description : Two masses, one of the 10kg and the other unknown, are placed on a scale in a region where g = 9.67 m/sec2 . The combined weight of these two masses is 174.06 N. Find the unknown mass in kg. a. 20 kg b. 19 kg c. 18 kg d. 17 kg formula: m=Fg k / g
Last Answer : 18 kg
Description : Normally hydrogen is placed in
Last Answer : Normally hydrogen is placed in A. IA B. IVA C. VIIA D. All of these
Description : If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen
Last Answer : ANS: A
Description : Give reason: In the first period, hydrogen and helium are not placed adjacent to each other OR There is a big gap between hydrogen and helium in the periodic table.
Last Answer : Because Hydrogen and Helium belong to different groups. The Hydrogen element belongs to the 'Hydrogen' group, whereas the Helium element belongs to the 'noble gas'
Description : Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia? (1) 18 (2) 17 (3) 16 (4) 15
Last Answer : (2) 17 Explanation: Ammonia (NH3) is composed of one atom of Nitrogen and three Hydrogen atoms. This means that its molar mass of ammonia will be the sum of the molar mass of one nitrogen atom and three times the molar mass of a hydrogen atom.
Description : Liquid hydrogen boils at 17 K. What is the temperature in degrees Celsius? a. 290 b. 63 c. -120 d. -256
Last Answer : -256
Description : All the following complexes show decrease in their weights when placed in a magnetic balance then the group of complexes having tetrahedral geometry i
Last Answer : All the following complexes show decrease in their weights when placed in a magnetic balance then the group of ... III C. I,III,IV D. none of these
Description : If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride.
Last Answer : If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride.
Description : a. 1s^2 b. 1s^22s^22p^6 In which group and period of the periodic table they are placed?
Last Answer : The electronic configuration of some elements are given below : a. 1s2 b. 1s22s22p6 In ... and period of the periodic table they are placed?
Description : In which group of elements of the modern periodic table are halogen placed ?
Last Answer : In which group of elements of the modern periodic table are halogen placed? a. 17 b. 6 c. 4 d. 2
Description : Why are noble gases placed in a separate group?
Last Answer : Nobel gases are very unreactive. So, they are placed in a separate group.
Description : A main office of group of post offices consisting of itself and a number of smaller offices called sub and branch office which have been placed under its Account jurisdictions is called as a) Head Post Office b) First class post office c) General Post Office c) None of these
Last Answer : a) Head Post Office
Description : A group of Blue collar customers of a bank will be placed in which of the following segments ? 1. Profession segments 2. Gender based segment 3. Income segment 4. Institutional Segment 5. None of these
Last Answer : Profession segments
Description : Which of the element of group 17 is radioactive? -Do You Know?
Last Answer : answer:
Description : If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have?
Last Answer : This atom become an anion with negative charge -1.
Description : Which of the element of group 17 is radioactive?
Last Answer : Astatine
Description : The increasing order of reactivity among group 1 elements is Li
Last Answer : Ans. In group 1 elements (alkali metals) the reactivity of the metals is mainly due to the electron releasing tendency of their atoms, which is related to ionization enthalpy, Since ... electron gain enthalpy. Since both of them decrease down the group, the reactivity therefore decreases.
Description : How does electro negativity vary down the group 17 and why? How does it vary from left to right in the period? Name an element having highest electro negativity.
Last Answer : Ans. Electro negativity decreases down the group due to increase in atomic size. It increases along the period from left to right due to decrease in atomic size. Fluorine (F) has highest electro negativity.
Description : Taking first period and 17 th group of the periodic table, write gradation of properties with respect to the following: a) atomic size b) Ionisation energy c) electro positivity and electro negativity.
Last Answer : The elements of 1 st period are hydrogen and helium. a) Atomic size of hydrogen is larger then that of helium because atomic size decreases across a period. b) Ionisation energy of helium ... higher as it increases down the group. Electro negativity of fluorine as it decreases down the group.
Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.
Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron