Question

07 Three test tubes are given one contain distilled water and
remaining two acid and base respectively. How to distinguish
them using litmus paper.
Chap - 3 Metal and Non-Metals
01 Mg strip is burned in air. Kavya takes the ash and dissolves it in
water and tests by litmus. Write the observation of the following
a) Name the product formed and write its molecular formula.
b) Complete the reaction MgO + HO →
02 When PbNO, is mixed with KL .......
a) color and name of the ppt.
b) balance chemical equation of the reaction.
c) type of reaction.
07 Explain the reactivity or activity series of metal. Arrange the
metal in their decending order according to that activity series.
08 Shows the electron dot structure of Sodium, Oxygen, Mg,
09 Explain the formation of NaCl
10 Four metals A, B, C and d is taken and is added in the solution
as shown in the table obersrvation are given
Metal FeSo, CuSo, ZnSo. AgNo,
A No reaction Displacement -
reaction
B Displacement
No reaction
reaction
No reaction No reaction No reaction
No reaction No reaction No reaction No
reaction
Answer the questions
1) Which is the most active metal?
2) If B is added in Cuso, solution which observation is noted ?
3) Arrange the A, B, C and D in the descending order of reactivity.
Chap - 4 Carbon and its Compounds
01 Explain the covalent bond in molecule.
02 Explain the formation of covalent bond in the water molecule,​

Answer 1

Answer:

Explanation: when the red litmus turn into blue then we can understand it is basic in nature. When the blue litmus change into red we can understand it is acidic in nature. When there is a slight change in litmus like purple then it is distilled water.

Answer 2

Answer:

7) no colour change=>distilled water

red colour=>acidic

blue colour =>basic

chap-3

1)a) magnesium hydroxide; Mg(OH)2

b)MgO+H2O=>Mg(OH)2

2)a) yellow; LEAD iodide

b)PbNO+KI=>PbI+KNO3

c) double displacement reaction

3)