Choose the right answer: 1- ALL THE FOLLOWING METALS ARE AMONG THE TEN MOST ABUN
ID: 783200 • Letter: C
Question
Choose the right answer:
1- ALL THE FOLLOWING METALS ARE AMONG THE TEN MOST ABUNDANT ELEMENTS IN THE EARTH'S CRUST EXCEPT:
a) Al.
b) Fe.
c) Na.
d) Mn.
e) Ca.
2- WHICH OF THE FOLLOWING IS/ARE CHARACTERISTIC PROPERTY/IES OF METALS:
1} METALS ARE REDUCING AGENTS.
2} THERMAL CONDUCTIVITY IS DUE TO THE DELOCALIZED ELECTRONS.
3} ELECTRICAL CONDUCTIVITY IS DUE TO THE DELOCALIZED ELECTRONS.
a) 1 only.
b) 2 only.
c) 3 only.
d) 2 and 3.
e) 1,2 and 3.
3- WHICH OF THE FOLLOWING OCCURS IN ELEMENTAL FORM IN NATURE:
1} Au.
2} Na.
3} Ca.
a) 1 only.
b) 2 only.
c) 3 only.
d) 1 and 2.
e) 1,2 and 3.
4- ALUMINUM IS OBTAINED FROM A Al2O3-Na3AlF6 MIXTURE BY:
a) flotation.
b) electrolysis.
c) reduction with carbon.
d) reduction with H2.
e) reduction with CO.
5- THE MOST ABUNDANT ELEMENTS IN THE EARTH'S CRUST ARE:
a) Si and O.
b) Al and O.
c) Al and Si.
d) Si and H.
e) H and O.
6- WHICH OF THE FOLLOWING IS/ARE IMPORTANT REDUCING AGENTS IN THE RECOVERY OF METALS FROM THEIR COMPOUNDS?
1} NaOH.
2} CO.
3} C.
a) 1 only.
b) 2 only.
c) 3 only.
d) 2 and 3 only.
e) 1,2 and 3.
7- WHICH OF THE FOLLOWING HYDROXIDES HAS AMPHOTERIC CHARACTER?
a) KOH.
b) CsOH.
c) Al(OH)3
d) B(OH)3
e) Ba(OH)2
8- AN ELEMENT OBTAINED COMMERCIALLY FROM SEAWATER AND SALT BRINE IS:
a) aluminum.
b) beryllium.
c) potassium.
d) magnesium.
e) sulfur.
9- SODIUM REACTS WITH WATER WITH THE FORMATION OF:
a) Na2O.
b) O2.
c) NaOH + H2.
d) Na2O + O2.
e) Na2+H2.
10- WHICH OF THE FOLLOWING ARE CHARACTERISTIC PROPERTIES OF THE METLAS IN GROUP IA OF THE PERIODIC TABLE?
1} THEY FORM 1+ IONS.
2} THEIR OXIDES DISSOLVE IN WATER TO FORM BASIC SOLUTIONS.
3} THE IONIC RADIUS IS MUCH SMALLER THEN THE ATOMIC RADIUS.
a) 1 only.
b) 2 only.
c) 3 only.
d) 1 and 3 only.
e) 1,2 and 3.
11- THE PREPARATION OF HIGHLY REACTIVE METALS LIKE GROUP IA ELEMENTS IS GENERALLY ACCOMPLISHED BY:
a) electrolysis.
b) reduction with carbon.
c) smelting of the sulfide ores.
d) reduction with zinc.
e) thermal decomposition of the oxides.
12- WHICH OF THE FOLLOWING COMPOUNDS IS A PEROXIDE?
a) Na2O.
b) BaO.
c) Na2O2.
d) Al2O3.
e) SiO2.
13- WHICH ELEMENT HAS THE LARGEST FIRST IONIZATION ENERGY?
a) Be.
b) Mg.
c) Ca.
d) Sr.
e) Ba.
14- WHICH ELEMENT HAS BOTH +2 AND +4 OXIDATION NUMBERS?
a) Be.
b) B.
c) Al.
d) TI.
e) Sn.
15- ALL THE COMPOUNDS GIVIEN BELOW WOULD BE EXPECTED TO REACT WITH OXYGEN EXCEPT:
a) NH3.
b) N2H4.
c) Li3N.
d) N2O4.
e) N2O5.
16- WHICH OF THE FOLLOWING ELEMENTS HAS ALLOTROPES?
1} Sulfur.
2} Fluorine.
3} Phosphorus.
a) 1 only.
b) 2 only.
c) 3 only.
d) 1 and 3 only.
e) 1,2 and 3.
Explanation / Answer
1. D
2. E
3.A
4.B
5.A
6.D
7.C
8.D
9.C
10.E
11.A
12.C
13.A
14.E
15.C
16.D