OMTEX CLASSES
“THE HOME OF SUCCESS”
Q1. A. Fill in the blanks.
1. The formula of chloride of metal M is MCl2. The metal M belongs to group ______
2. The arrangement of elements in a group of three is known as ________.
3. The element eka – aluminum in Mendeleev’s periodic table is known as _________in modern periodic table.
4. The chemical formula of POP is_________.
5. Corrosion can be prevented by using____________.
6. The chemical reactions is which heat is liberated are called _________reactions.
7. Phenolphthalein is __________type of indicator.
8. pH scale ranges from ________to_________
9. Sodium or potassium salts of higher fatty acids are termed as _________
10. 10% NaCl is known as__________.
Q2. Write short notes on
1. pH scale (with proper diagram).
2. Water of crystallization (with proper example)
Q3. Answer the following questions.
- State application (uses) of baking soda.
- In modern periodic table, which are the metals, non metals and metalloids among the first 20 elements?
- Define atomic size. How does it vary in a period and in a group?
Q4. Give Scientific reasons.
1. Physical states of reactants and products are mentioned while writing a chemical equation.
2. Iron articles rust readily whereas steel which is also mainly made of iron will not undergo corrosion.
3. Edible oil is not allowed to stand for a long time in air.
4. Metallic character decreases from left to right in a period.