Time: 1 hour MARKS: 40 MARKS SECTION:'A'
Chapters
Covered : SCHOOL
OF ELEMENTS , MAGIC
OF CHEMICAL REACTION , ELECTRIC
SPARK
1. (A) Fill in the
blanks. (5 Marks)
1. The horizontal rows in the periodic table are
................ .
2. From left to right, the atomic size of an
atom................. .
3. There are ............... periods in the
periodic table.
4. An element is placed in group II A, so the
number of valence electrons is ..............
5. An element is placed in 2nd period, so it has
....................... shells.
A.
Answers.
1. Periods
2. Decreases
3. 7
4. 2
5. 2
(B) Rewrite the
following statements by selecting the correct options: (5 Marks)
1. Ice changing to water is an example of
....................... change.
2. When copper powder is heated, ....................... is formed.
3. The substances that undergo changes are called as .......................
2. When copper powder is heated, ....................... is formed.
3. The substances that undergo changes are called as .......................
4. Conversion of oil to fats requires
....................... as catalyst.
5. When vegetable oil is mixed with nickel as a catalyst, and heat it with hydrogen gas ....................... are obtained on cooling.
5. When vegetable oil is mixed with nickel as a catalyst, and heat it with hydrogen gas ....................... are obtained on cooling.
Answers
1. Physical
1. Physical
2. Copper oxide
3. Reactants
4. Nickel
5. Fats
2. Attempt the
following. (10 Marks)
3. Attempt the
following. (15 Marks)
3. Explain the following terms: Rancidity, Endothermic Reactions, Redox reaction
5. Define the following:
Q4. Attempt the
following (any 1) ( 5 marks)