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प्रश्न
Give reason.
Acidic soil is treated with quick lime.
उत्तर
If the soil is acidic it can be treated with base like quick lime, to make it neutral.
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संबंधित प्रश्न
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
Fill in the blank
A new substance is always formed in a _______ change.
True or false
New substances are formed in a chemical change.
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
When electric current is passed through acidulated water ______ of water takes place.
Explain the term reactant and product giving examples.
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
What do you observe when H2S is passed through a lead nitrate solution.
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
What happens when cane sugar is strongly heated? Mention any two changes in it.
________ is a chemical substance which alters the speed of a chemical reaction.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
Galvanization is a process in which ______ is coated as a layer of iron.
Iron and rust are the same substances.
Write the characteristics of chemical change.
