Science
The electronic structures of atoms P and Q are shown below :
Based on the information given above, answer the following questions:
(a) If P and Q combine to form a compound, what type of bond is formed between them?
(b) Give the chemical formula of the compound formed.
(c) The compound so formed is dissolved in water. Is the resultant solution acidic or basic in nature? Justify your answer.
(d) Write the chemical equation for the reaction between ‘Q’ and ethanol.
(e) What will be the formula of the compound formed when ‘P’ undergoes bonding with carbon?
Metals & Non-Metals
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Answer
(a) Ionic bond.
Atom Q has 1 valence electron and atom P has 6 valence electrons so Q transfers its one electron to P (which needs two electrons to complete an octet), so ions Q+ and P2- attract electrostatically and form an ionic bond.
(b) Because two Q+ ions are needed to balance the -2 charge on one P2- ion, the simplest whole-number ratio is Q2P.
(c) As, Q2P is a metal oxide and metal oxides react with water to give alkalies, so the solution turns basic.
(d) 2C2H5OH + 2Q → 2C2H5OQ + H2 (↑)
(e) If P is oxygen-like (valency 2), carbon (valency 4) combines to give CP2 (analogous to CO2).
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Related Questions
Sara took 2 mL of dilute NaOH solution in a test tube and added two drops of phenolphthalein solution to it. The solution turned pink in colour. She added dilute H2SO4 to the above solution drop by drop until the solution in the test tube became colourless. 40 drops of dilute H2SO4 were used for the change in colour from pink to colourless. When Sara added a drop of NaOH to the solution, the colour changed back to pink again.
Sara now tried the activity with different volumes of NaOH and recorded her observation in the table given below :S.
No.Volume of dil. NaOH taken (mL) Drops of dil. H2SO4 used 1 2 20 2 3 30 3 4 40 Answer the following questions based on the above information:
(a) If Sara used concentrated H2SO4 in place of dilute H2SO4, how many drops will be required for the change in colour to be observed?
- 40
- < 40
- > 40
Justify your answer.
(b) Sara measured 20 drops of dil. H2SO4 and found its volume to be 1 mL. If Sara observed a change in colour of NaOH solution by using 3 mL of H2SO4, how many mL of NaOH did she add to the test tube initially?
OR
Sara takes 10 drops of dilute H2SO4 in the test tube and adds two drops of phenolphthalein solution to it. Then she adds NaOH dropwise. Sara observes a change in colour after adding 20 drops of NaOH. What change in colour would she observe and why?
(c) Write a balanced chemical equation for the reaction taking place in the above experiment. Which of the following is true and why? The reaction is a
- neutralisation and double displacement reaction
- neutralisation and precipitation reaction
- precipitation and double displacement reaction
- neutralisation, double displacement as well as precipitation reaction.
A hydrocarbon with the formula CxHy undergoes complete combustion as shown in the following equation :
2CxHy + 9O2 → 6CO2 + 6H2O.
(a) What are the values of ‘x’ and ‘y’?
(b) Give the chemical (IUPAC) name of the hydrocarbon.
(c) Draw its electron dot structure.
(d) Name the alcohol which on heating with conc. H2SO4 will produce the above hydrocarbon CxHy.
(e) Write a balanced chemical equation for the reaction of CxHy with hydrogen gas in presence of Nickel.
A hydrocarbon with the formula CxHy undergoes complete combustion as shown in the following equation:
2CxHy + 9O2 → 6CO2 + 6H2O
(a) What are the values of ‘x’ and ‘y’?
(b) Give the chemical (IUPAC) name of the hydrocarbon.
(c) Is CxHy a saturated or an unsaturated hydrocarbon?
(d) Name the alcohol which on heating with conc. H2SO4 will produce the above hydrocarbon CxHy.
(e) Write a balanced chemical equation for the reaction of CxHy with hydrogen gas in presence of Nickel.
Oxygen can combine with both metals and non-metals. It combines with Calcium to form CaO and with carbon to form CO2.
(a) What type of bond is formed between carbon and oxygen?
(b) Identify the type of bond formed between Calcium and oxygen.
(c) Which of the above compounds will be a good conductor of electricity in molten state and why?
(d) Comment on the physical state (solid, liquid or gas) of CaO and CO2.
(e) What is the valency of carbon in CO2?