1) Elements of P-block are arranged in  a) Two groups b) Five groups c) Six groups d) Eight groups 2) Which of the following elements locates in the third period? a) K19 b) P15 c) C6 d) Li3 3) An element, its atomic number is 18, it is called a) Inert gas b) Transition element c) Metallic element d) Halogen 4) The elements which have the same properties are located in the same a) Period b) Energy level c) Group d) Nucleus 5) The block that contains the elements of group (1A) and group (2A) is the a) d-block b) P-block c) S-block d) F-block 6) An element X its atomic number is 15, so the number of electrons in its ion is a) 10 b) 15 c) 17 d) 18 7) By increasing the atomic number within the same period, the  a) metallic property increases b) metallic property decreases c) nonmetallic property increases d) atomic size increases 8) Metal oxides are a) Acidic oxides b) Amphoteric oxides c) Basic oxides d) Neutral oxides 9) All of the following do not react with dilute HCL except: a) Cl b) Zn c) S d) C 10) Sodium oxide is from a) Basic oxides b) Acidic oxides c) Nonmetallic d) Amphoteric 11) Alkali metals have the following properties except: a) Low density b) Conduct heat c) Conduct electricity d) Do not react with water 12) Most of ..................are kept under the surface of kerosene in the lab a) Alkaline earth metals b) Halogens c) Innert gases d) Alkali metals 13) When sodium reacts with water, ......................gas evolves a) O2  b) Co2 c) H2 d) No2 14) The most active element in group (1A) is : a) Na b) Cs c) K d) Li 15) Halogens are monovalent a) True b) False 16) All of the following are from water properties except: a) it exists in 3 states b) its density decreases on freezing c) it has a high boiling point d) it is an ionic compound 17) Water molecule consists of  a) two atoms of three different elements b) three atoms of three different elements c) three atoms of two different elements d) four atoms of two different elements 18) Akind of water pollution results from dumping of atomic wastes in the seas a) Thermal pollution b) Chemical pollution c) Radiant pollution d) Biological pollution 19) The bond which is responsible water properties a) Covalent bond b) Hydrogen bond c) Ionic bond d) Hydrogen atom 20) In water electrolysis, oxygen gas evolves at: a) Anode b) Cathode

Prep 2-Science-Unit1 Exam

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