291Solutions of Success Achiever (Part-I) Inorganic Chemistry

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Section - C : Assertion - Reason Type1. Answer (4)

Temporary hardness is due to bicarbonate of calcium and magnesium.

2. Answer (1)

NaH Na+ + H in aqueous solution. These ion conduct electricity in aqueous solution.3. Answer (2)

4. Answer (2)

5. Answer (2)

Both statements are correct.

6. Answer (4)

Mg has highest ionisation energy, value due to its smaller size and fully field s-orbital.

7. Answer (1)

Due to cohesive forces.

8. Answer (1)

9. Answer (2)

Both statements are correct.

10. Answer (3)

11. Answer (2)

Their electrons are easily excited to higher energy states by absorbing heat energy from non-luminous oxidisingflame.

12. Answer (2)

Both statements are correct.

13. Answer (2)

14. Answer (3)

++ ++++ Na2OH6PO)NH(MgOH5OHNHHPONaMg)Pptwhite(

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15. Answer (4)

BaCO3 > SrCO3 > CaCO3 > MgCO3(Thermal stability)

16. Answer (1)

Na has greater cohesive forces.

17. Answer (2)

Be(OH)2 reacts with acids and bases both.

18. Answer (2)

BI3 is stronger Lewis acid than BF3 due to less effective pp back bonding in BI3 which si more prominent inBF3.

19. Answer (1)

Due to high hydration energy, Al+3 is ionic compound.

292 Inorganic Chemistry Solutions of Success Achiever (Part-I)

Aakash Educational Services Ltd. Regd. Office: Aakash Tower, Plot No.-4, Sector-11, Dwarka, New Delhi-75 Ph.011-47623456

20. Answer (4)

Statement-1 is incorrect Statement-2 is correct WC (tungsten carbide) is interstitial carbide.21. Answer (2)

22. Answer (2)

O

Si

OOO

In silicate tetrahedral, each silicon atom is bonded with four oxygen.

Si 44O is basic unit of all type of silicate.

23. Answer (3)

Due to poor screening of 4f orbital, effective nuclear charge is higher in case of lead in compare to tin althoughsize of lead is larger than tin.