An element ‘X’ displaces iron from the aqueous solution of iron sulphate. List your observations if the element ‘X’ is treated with the aqueous solutions of copper sulphate, zinc sulphate and silver nitrate. Based on the observations arrange X, Zn, Cu and Ag in increasing order of their reactivities.
Ag < Cu < Zn < X
Ag < Cu > Zn < X.
Cu < Zn < X< Ag
X<Cu < Zn < Ag
Reaction of 'magnesium' with air is
Exothermic reaction
Endothermic reaction
Reversible reaction
Substitution reaction
In writing chemical equations, inclusion of state symbols shall be done while
Correct chemical formulae of reactants and products are written
The equation is being balanced to fulfill the law of conservation of mass
The equation has been balanced
The chemical formulae of products and reactants have been changed to bring about quick balancing
The reaction in which two compounds exchange their ions to form two new compounds is called
Displacement reaction
Combination reaction
Double displacement reaction
Redox reaction
On immersing an iron nail in CuSO₄ solution for a few minutes, you will observe
No reaction takes place
The color of solution fades away
The surface of iron nails acquire a black coating
The color of solution changes to green
Which of the given statements is not a physical change?
Boiling of water to give water vapour
Melting of ice to give water
Dissolution of salt in water
Combustion of Liquefied Petroleum Gas (LPG)
In which of the given, heat energy will be evolved?
Electrolysis of water
Dissolution of NH₄Cl in water
Burning of L.P.G.
Decomposition of AgBr in the presence of sunlight
When crystals of lead nitrate are heated strongly in a dry test tube
Crystals immediately melt
A brown residue is left
White fumes appear in the tube
A yellow residue is left
Paheli Is Writing Some Statement Which Is Given By Her Teacher. Would You Help Him To Choose The Incorrect Statements?
The combustion reaction of candle wax is characterized by a change in state from solid to liquid and gas.
When a chemical reaction absorbs heat energy, then the temperature of reaction mixture is falls and it becomes cold.
When a Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas.
None of the above.
Which Of The Following Statement Is Or Are Incorrect?
The burning of magnesium in air to form magnesium oxide.
The properties of the product magnesium oxide are entirely different from the reactants.
The chemical reaction between sodium carbonate and dilute
None of the above
Magnesium ribbon is rubbed before burning because it has a coating of
basic magnesium carbonate
basic magnesium oxide
basic magnesium sulphide
basic magnesium chloride
Which of the following statements about the given reaction are correct? 3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent
(i), (i) and (iii)
(i) and (iv)
(i), (ii) and (iv)
(ii) and (iv)
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 Identify the substance oxidized in the above equation.
MnCl2
HCl
H2O
MnO2
A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
CaOCl2
Ca (OH)2
CaO
CaCO3
Select the oxidising agent for the following reaction: H2S + I2 → 2HI + S
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