SSC (English Medium) 10th Standard - Maharashtra State Board Important Questions for Science and Technology 1

Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.

Distinguish between:

s-block - p-block

Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.

1. What is A element metal or nonmetal?
2. Which is the outermost orbit of element B?
3. Identify C element and it's physical state.

Define periods of modern periodic table.

Define groups of modern periodic table.

Select the appropriate options and complete the following paragraph:

(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).

On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.

Corrosion can be prevented by using ……………. solution.

Reaction of iron nails with copper sulphate solution is an example of
(a) Combination reaction
(b) Decomposition reaction
(c) Displacement reaction
(d) Double displacement reaction

Complete the following reaction, balance it and write the name of the products CuO + HCI →_________ + _________

CuSO_4(aq) + Zn_(s) → ZnSO_4(aq) + Cu_(s) is an example of a decomposition reaction.

The reddish brown deposit formed on iron nails kept in a solution of copper sulphate is

1. Cu₂O
2. Cu
3. CuO
4. CuS

After you have dinner tonight, wash your own plates with soap/detergent.

1. What colour change is observed when soap/detergent is applied?
2. Name the type of reaction and explain it.

Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:

The chemical formula for rust is.............. .

When the substance ‘A’ is added to a solution of BaSO₄, a yellow precipitate is formed.

1. What do you think substance A is likely to be?
2. Name the precipitate.
3. Which type of reaction is this?

Taking into consideration the relationship in the first pair, complete the second pair

2H₂ + O₂ → 2H₂O :Combination Reaction :: 2HgO → 2Hg + O₂:_________

Find the odd man out:

Turmeric, Methyl Orange, Rose petals, Beetroot.

Rewrite the following statements by selecting the correct options:
\[\ce{CaCO3 ->[\Delta] CaO + CO2 ^}\] is a __________ reaction.

What is meant by rust?

Write the chemical formula of rust.