Important question of p-block for Maharashtra State board exam
Answer (1)
28th Jan, 2019
- In the preparation of H2S04 by Contact Process, why is 503 not absorbed directly in water to form H2S04?
- Write a balanced chemical equation for the reaction showing catalytic oxidation of NH3 by atmospheric oxygen.
- Write the structure of pyrophosphoric acid .
- PH3 forms bubbles when passed slowly in water but NH3 dissolves . Explain why?
- In PCl5, phosphorus is in sp3d hybridised state but all its five bonds are not equivalent. Justify your answer with reason.
- Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?
- Give reason to explain why CIF3 exists but FCl3 does not exist.
- Out of H20 and H2S,which one has higher bond angle and why?
- SF6 is known but SCl6 is not. Why?
- On reaction with Cl2,phosphorus forms two types of halides 'A' and 'B'. Halide A is
- yellowish-white powder but halide 'B' is colourless oily liquid . dentify A and B and write the formulas of their hydrolysis products.
- In the ring test of N03- ion,Fe2+ ion reduces nitrate ion to nitric oxide, which combines
- with Fe2+ (aq) ion to form brown complex . Write the reactions involved in the formation of brown ring.
- Explain why the stability of oxyacids of chlorine increases in the order given below : HCIO <HCI02 < HCI03 < HCI04
- Explain why ozone is thermodynamically less stable than oxygen.
- P406 reacts with water according to equa tion P406 + 6H20 -> 4H3P03. Calculate thevolume of 0.1 M NaOH solution required to neutralise the acid formed by dissolving 1.1 g of P406 in H20
- White phosphorus reacts with chlorine and the product hydrolyses in the presence ofwater. Calculate the mass of HCI obtained by the hydrolysis of the product formed by the reaction of 62 g of white phosphorus with chlorine in the presence of water.
- Name three oxoacids of nitrogen. Write the disproportionation reaction of that oxoacid of nitrogen in which nitrogen is in +3 oxidation state.
- Nitric acid forms an oxide of nitrogen on reaction with P4010 . Write the reaction involved .Also write the resonating structures of the oxide of nitrogen formed.
- Phosphorus has three allotropic forms - (i) white phosphorus (ii) red phosphorus and (iii) black phosphorus. Write the difference between white and red phosphorus on the basis of their structure and reactivity .
- Give an example to show the effect of concentration of nitric acid on the formation of oxidation product.
- PCl5 reacts with finely divided silver on hea ting and a white silver salt is obtained,which
- dissolves on adding excess aqueous NH3 solution. W rite the reactions involved to explain what happens.
- Phosphorus forms a number of oxoacids. Out of these oxoacids phosphinic acid hasstrong reducing property. Write its structure and also write a reaction showing its reducing behaviour.
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