Question
Draw the orbit structure of the following:
$N_2$
$N_2$
✓
Answer
orbit structure of $N_2$ :
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Distinguish between the saturated hydrocarbon ethane and the unsaturated hydrocarbon ethene by drawing their structural formulae.
Explain, why electrolysis is an example of redox reaction?
From the equation :
$C + 2H_2SO_4 \rightarrow CO_2 + 2H_2O + 2SO_2$
Calculate:
$(i)$ The mass of carbon oxidized by $49g$ of sulphuric acid $(C = 12,$ relative molecular mass of sulphuric acid $= 98)$
$(ii)$ The volume of sulphur dioxide measured at $\text{STP},$ liberated at the same time.
→$C + 2H_2SO_4 \rightarrow CO_2 + 2H_2O + 2SO_2$
Calculate:
$(i)$ The mass of carbon oxidized by $49g$ of sulphuric acid $(C = 12,$ relative molecular mass of sulphuric acid $= 98)$
$(ii)$ The volume of sulphur dioxide measured at $\text{STP},$ liberated at the same time.
When heated, potassium permanganate decomposes according to the following equation $:2KMnO_4 \rightarrow K_2MnO_4+ MnO_2 + O_2$
Given that the molecular mass of potassium permanganate is $158g,$ what volume of oxygen $($measured at room temperature$)$ would be obtained by the complete decomposi tion of $15.8g$ of potassium permanganate?
$($Molar volume at room temperature is $24$ litres$). [K = 39, Mn = 55, 0 = 16 ]$
→Given that the molecular mass of potassium permanganate is $158g,$ what volume of oxygen $($measured at room temperature$)$ would be obtained by the complete decomposi tion of $15.8g$ of potassium permanganate?
$($Molar volume at room temperature is $24$ litres$). [K = 39, Mn = 55, 0 = 16 ]$
Copy and complete the following table which refers to the action of heat on some carbonates :
| Carbonate | Colour of residue on cooling |
| Zinc carbonate | |
| Lead carbonate | |
| Copper carbonate |
Explain the following briefly:
Helium does not form $He_2$ molecule
→Helium does not form $He_2$ molecule
An aqueous solution of sodium chloride is not used for electrolytic reduction of sodium metal. Why?
X, Y, and Z are three crystalline solids that are soluble in water and have common anion. To help you to identify X, Y and Z you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).
(a) A reddish-brown gas is obtained when X, Y, and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.
Inference 1: The common anion is _____ion.
(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.
Inference2: The cation in X is either _____ or _____.
(c) The action of heat on Y produces a reddish-brown gas and yellow residue which fuses with a glass of the test tube.
Inference3: The metal ion present in Y is the____ ion.
(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas that turns moist red litmus paper blue.
Inference4: Z contains the ____ cation.
(e) Write the equations for the following reactions:
→(a) A reddish-brown gas is obtained when X, Y, and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.
Inference 1: The common anion is _____ion.
(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.
Inference2: The cation in X is either _____ or _____.
(c) The action of heat on Y produces a reddish-brown gas and yellow residue which fuses with a glass of the test tube.
Inference3: The metal ion present in Y is the____ ion.
(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas that turns moist red litmus paper blue.
Inference4: Z contains the ____ cation.
(e) Write the equations for the following reactions:
- X and concentrated sulphuric acid (below $200^oC$). (One equation only for either of the cations given in Inference 2)
- The action of heat on Y.
- Concentrated nitric acid is added to copper turnings kept in a beaker.
What volume of hydrogen and oxygen measured at S.T.P. will be required to prepare 1.8 g of water?
The following is a list of methods for the preparation of salts.
A – direct combination of two elements
B – reaction of a dilute acid with a metal.
C – reaction of a dilute acid with an insoluble base.
D – titration of a dilute acid with a solution of soluble base.
E – reaction of two solutions of salts to form a precipitate.
Choose from the above list A to E, the best method of preparing the following salts by giving a suitable equation in each case:
1. Anhydrous ferric chloride,
2. Lead chloride,
3. Sodium sulphate.
4. Copper sulphate.
A – direct combination of two elements
B – reaction of a dilute acid with a metal.
C – reaction of a dilute acid with an insoluble base.
D – titration of a dilute acid with a solution of soluble base.
E – reaction of two solutions of salts to form a precipitate.
Choose from the above list A to E, the best method of preparing the following salts by giving a suitable equation in each case:
1. Anhydrous ferric chloride,
2. Lead chloride,
3. Sodium sulphate.
4. Copper sulphate.