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प्रश्न
One of the following does not happen during a chemical reaction. This is:
(a) Breaking of old chemical bonds and formation of new chemical bonds
(b) Formation of new substances with entirely different properties
(c) Atoms of one element change into those of another element to form new products.
(d) A rearrangement of atoms takes place to form new products.
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उत्तर
(c) atoms of one element change into those of another element to form new products
It is not atoms but the bonds between these atoms break and form during chemical reactions. Atoms of elements can rearrange but cannot change into other element.
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संबंधित प्रश्न
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
Balance the gievn equation:
NaOH + H2SO4 
Na2SO4 + H2O
Balance the following equation and add state symbols:
Zn + HCI → ZnCI2 + H2
The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is know as:
(a) law of conservation of momentum
(b) law of conservation of mass
(c) law of conservation of motion
(d) law of conservation of magnetism
Name the type of chemical reaction shown by the following equation:
2Mg+ O2 → 2MgO
Write word equation for the following skeletal equation:
\[\ce{AgBr -> Ag + Br2}\]
Balance the following chemical equation :
H2 + O2 → H2O
What information do you get from the equation H2+ Cl2 → 2HCl ?
Balance the following equation. Also name the products formed.
\[\ce{Ag + S -> Ag2S}\]
Balance the following equation:
Pb3O4 + HCl → PbCl2 + H2O + Cl2
Write the balanced chemical equation of the following reaction. potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
Write the balanced chemical equation of the following reaction.
barium chloride + sulphuric acid → barium sulphate + hydrochloric acid
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of chlorine gas formed.
Give word equation for the following chemical reaction and give the names of the product formed.
ZnCO3 → ZnO + CO2
Give an example of a chemical equation in which two reactants form:
three product
Write a balanced equation for the following word equation:
Potassium bromide + Chlorine → Potassium chloride + Bromine
What is a chemical equation?
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
- In beakers A and B, exothermic process has occurred.
- In beakers A and B, endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
What is a product in a chemical equation?
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
