Question

please solve it fast......​

Answer 1

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1)QUESTION:

--》When two elements combine to form a single compound, the reaction is said to be chemical combination.

ANSWER:

--》TRUE

REASON:

--》When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).

2)QUESTION:

--》The reaction between quick lime and water is an endothermic reaction.

ANSWER:

--》FALSE

REASON:

--》The quick lime reaction with water is exothermic in nature due to production of heat. ... The reaction is a combination reaction owing to the fact that calcium oxide and water react with each other to form only one single product i.e. calcium hydroxide

3)QUESTION:

--》Reaction between magnesium and iron sulphate solution is a chemical double decomposition reaction.

ANSWER:

--》FALSE

REASON:

--》It is called a displacement reaction. It happens because magnesium is more reactive than iron

4)QUESTION:

--》All non-metallic oxides are known as acidic oxides.

ANSWER:

--》TRUE

REASON:

--》The oxides of non-metals are acidic. If a non-metal oxide dissolves in water, it will form an acid. The non-metal oxides can be neutralized with a base to form a salt and water.

5)QUESTION:

--》Some of the metallic oxides are known as basic oxides.

ANSWER:

--》TRUE

REASON:

--》Metallic oxides are basic in nature because they react with dilute acids to form salt and water. They also react with water to form metal hydroxides which are alkaline in nature, as these metal hydroxides release OH- ions in solution