Carbon And Its Compounds – Notes Covalent compound:- The compound formed by the sharing of electrons between the atoms is known as covalent compound. Difference between covalent compound and ionic/electrovalent compounds:- No. Covalent compounds Ionic/Electrovalent compounds (i) Covalent compounds are formed by the sharing of electrons between atoms. Ionic compounds are formed by the transfer […]
Metal and Non-Metals Important Questions In what forms are metals found in nature? With the help of examples explain how metals react with oxygen, water and dilute acids. Also write chemical equations for the reactions. How is copper obtained from its ore (Cu2S)? Write only the chemical equations. How is copper thus obtained refined? Name […]
Metals And Non-Metals : Previous Years Questions Metal oxide generally reacts with acids, but few oxides of metals also react with bases, such metallic oxides are : MgO ZnO Al2O3 CaOa. 1 and 2 b. 2 and 3c. 3 and 4 d. 1 and 4 [1 mark] [CBSE 2023] Bronze is an alloy of a. […]
Metals and Non-metals Notes Physical properties of metals:- They are solid in state except mercury (liquid). They are malleable i.e., they can be beaten into thin sheet.Gold and silver are most malleable metals. They are ductile i.e., they can be drawn into thin wire.Gold is the most ductile metal. They are good conductors of heat […]
Acids, Bases and Salts Previous Years Questions Few drops of aqueous solution of ammonium chloride are put on a universal indicator paper. The paper turns pink. Study the following table and choose the correct option. [1 mark] [ CBSE 2023] Two salts ‘X’ and ‘Y’ are dissolved in water separately. when phenolphthalein is added to […]
Acids, Bases and Salts Important Questions Name the substance used in softening water. Tooth enamel is the hardest substance of the body due to which substance? What are alkalies? Give examples. Why should curd and sour substances not be kept in brass and copper vessels? You have been provided with three test tubes containing distilled […]