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s block element

Test1 Max. Marks = 40

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1. Washing soda is -

4 points

(A) Na₂CO₃.7H₂O

(B) Na₂CO₃ .10H₂O

(D) Na₂CO₃

Clear selection

2. On flame test K give .........colour -

4 points

(A) Golden yellow

(B) Crimson red

(D) Apple green

Clear selection

3.Plaster of paris is -

4 points

(A) CaSO₄.H₂O

(B) CaSO₄.2H₂O

(B) CaSO₄.3H₂O

(D) CaSO₄.1/₂ H₂O

Clear selection

4.Most electropositive element is -

4 points

(A) Li

(B) Na

(D) Cs

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5. The sodium carbonate is manufactured by -

4 points

(A) Castner’s process

(B) Solvay’s process

(D) Gossage process

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6.The correct order of hydration energy of alkaline earth metal ions is -

4 points

(A) Be²⁺ > Mg²⁺ > Ca²⁺ > Sr²⁺ > Ba²⁺

(B) Ba²⁺ > Be²⁺ > Ca²⁺ > Mg²⁺ > Sr²⁺

(D) None

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7. Mg is present in -

4 points

(A) Chlorophyll

(B) Haemoglobin

(D) Vitamin–B₂

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8. Li does not resemble other alkali metals in following properties

4 points

(A) Li₂CO₃ decomposes into oxides while other alkali carbonates are thermally stable

(B) LiCl is predominantly covalent

(D) All

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9. Dolomite is -

4 points

(A) KCl.MgCl₂.6H₂O

(B) CaCO₃.MgCO₃

(D) MgSO₄.7H₂O

Clear selection

10. The material used in photoelectric cells contains-

4 points

(A) Cs

(B) Li

(D) Mg

Clear selection

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