X.Durga Pooja Assignment.Session 21-22.
e- theme page. X. Durga Pooja Assignment. DAV Power Grid Campus, Biharshairf. Session 21 - 22 --------------------------------- |
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Page 3.
Chemistry.
Q.1. Aluminium is used
for making cooking utensils. Which of the following properties of aluminium are
responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Q.2. The most abundant
metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Q.3. The poorest
conductor of heat among metals is
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
Q.4. Which property of
metals is used for making bells and strings of musical instruments like Sitar
and Violin?
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity
Q.5. Al2O3 + 2NaOH → …… + H2O
(a) Al(OH)3
(b) Na2O
(c) NaAlO2
(d) AlNaO2
Q.6. Which of the
following is the correct arrange-ment of the given metals in ascending order of
their reactivity?
Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
Q.7. Which of the
following pairs will give dis-placement reactions?
(a) FeSO4 solution and Copper metal
(b) AgNO3 solution and Copper metal
(c) CuSO4 solution and Silver metal
(d) NaCl solution and Copper metal
Q.8. Non-metals form
covalent chlorides because
(a) they can give electrons to chlorine
(b) they can share electrons with chlorine
(c) they can give electrons to chlorine atoms to form chloride ions
(d) they cannot share electrons with chlorine atoms
Q.9. Which of the
following oxide(s) of iron would be obtained on prolonged reaction of iron with
steam?
(a) FeO
(b) Fe2O3
(c) Fe3O4
(d) Fe2O3 and Fe2O4
Q.10. Which of tire
following are not ionic compounds?
(a) KCl
(b) HCl
(c) CCl4
(d) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
X = 2, 4, Y = 2, 7, Z = 2,1 Which two elements will combine to form an ionic compound and write the correct formula, (a) X2Y (b) YZ (c) XZ3 (d) Y2Z
Q.12. The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the(a) electrolysis of their molten chloride(b) electrolysis of their molten oxides(c) reduction by aluminium(d) reduction by carbon
Q.13.Which of the following non- metal is lustrous?(a) Sulphur(b) Oxygen(c) Nitrogen(d) Iodine
Q.14.Example of an amphoteric oxide is
(a) Na2O(b) K2O(c) Al2O3(d) MgO
Q.15. Which one among the following is in an acidic oxide?
(a) Na2O (b) CO (c) CO2 (d) Al2O3
Q.16. The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X? (a) He (b) Ar (c) Ne (d) Kr
Q.17.The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called (a) Roasting (b) Reduction (c) Calcination (d) Smelting
Q.18.Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using (a) Aluminium as reducing agent (b) Sodium as reducing agent (c) Carbon as reducing agent (d) Calcium as reducing agent
Q.20. Galvanisation is a method of protecting iron from rudftng by coating with a thin layer of (a) Galium (b) Aluminium (c) Zinc (d) Silver
Q.21. An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following(a) Mg (b) Na (c) P (d) Ca
Q.22. Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z? (a) Has high melting point
(b) Has low melting point (c) Conducts electricity in molten state (d) Occurs as solid
Q.23. The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct? (a) X is a metal (b) Y is a metal
(c) Z is a non-metal (d) Y is a non-metal and Z is a metal
Q.24. Amalgam is an alloy of (a) Copper and Tin (b) Mercury
(c) Lead and Tin (d) Copper and Zinc
Q.25. Copper objects lose
their shine and form green coating of
(a) Copper oxide
(b) Copper hydroxide and Copper oxide
(c) Basic Copper carbonate
(d) Copper carbonate
1. Elements can be classified as ……… and ……. .
2. Two examples of metals which are poor conductors of heat are ………, ……… .
3. Two metals which melt when kept on the palm are ………, ……… .
4. A non-metal which is a good conductor of electricity is ……… .
5. Metals can form positive ions by ……… .
6. A non-metal which is lustrous is ……… .
7. A metal which burns in air with a dazzling white flame is ……… .
8. Metals above hydrogen in the activity series can displace ……… from dilute acids.
9. The extraction of metals from their ores and then refining them for use is known as ……… .
10. ……… is an allotroph of carbon and is the hardest natural substance.
11. Metals which are so soft that they can be cut with a knife are ………, ………
12. Metal oxides ……… and ……… dissolve in water to form alkalis. Note : Frame such more questions from Chapter 1 to Chapter 3 and do practice.
Thereafter I spoke , " Dear friends , Greetings on this auspicious day of Vijayadashmi . We all are ' Ravanas ' and we have to become ' Ram ' . As we all know that ' Ravana ' is said to have ten faces. It is not possible for a person to live with physical ten faces. Hence it was only symbolic of having ten different personalities.
just an eye of the trainer over the kid's Dandiya team before a beginning. |
kids enjoying Navrat Dandiya at DAV PG Campus Biharsharif. |
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