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 […]
Acids, Bases and Salts Notes Physical properties of acids:- Acids are sour in taste. Acids are corrosive in touch. Acids turn blue litmus red. Acids give H+ ion in water. Physical properties of bases:- Bases are bitter in taste. Bases are soapy in touch. Bases give OH– ion in water. Bases turn red litmus blue. […]
Chemical Reactions and Equations Previous Years Questions Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below:Zn(s) + H2SO4(l) → ZnSO4(X) + H2(Y)a. X is (s) and Y is (l) b. X is (aq) and Y is (g)c. […]
Chemical Reactions and Equations Important Questions What is a balanced chemical equation? Why is it important to balance a chemical equation? Define exothermic reaction. Why respiration is considered as exothermic reaction? A solution of substance ‘X’ is used for whitewashing.i. Name the substance ‘X’ & write its formula.ii. Write the reaction of ’X’ with water. […]
Chemical Reactions and Equations – Notes Chemical Reaction:- The change in which one or more new substances with different chemical properties are formed is called a chemical reaction. Common observations during a chemical reaction are:- Change in state Change in color Change in temperature Evolution of gas Word Equation:- A chemical reaction expressed in words rather than […]