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Element is a basic form of matter that cannot be broken down into simple forms by chemical reactions.

Monjur Alahi

Element is a basic form of matter that cannot be broken down into simple forms by chemical reactions. If any substance can be separated into two or more constituent parts by a chemical reaction it should be 

A) Mixture 

B) Heterogeneous mixture 

C) Homogeneous mixture 

D) Compound


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1 Answers

Salim Ahmed Kawsar

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Correct option is D) Compound

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……………. defined an element as any substance that cannot be decomposed into further simple substance by physical or chemical change. 

B) Robert Boyle

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An element “X forms an ionic compound with another element Y. Then the charge on the ion formed by X is …………….. 

Correct option is  A) +1

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The property of an element to exist in two or more physical forms with same chemical properties but different physical properties is called

C) allotropy

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Food in the form of a soft slimy substance where some proteins and carbohydrates have already been broken down is called : 

Food in the form of a soft slimy substance where some proteins and carbohydrates have already been broken down is called chyme

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The basic form of matter that cannot be broken down into simpler substances in chemical reactions is ……………… 

Correct option is B) compound

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A large magnet is broken into two pieces so that their lengths are in the ratio 2:1. The pole strengths of the two pieces will have the ratio

Correct option is: (A) 2 : 1

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Uma : Mass is neither created nor destroyed during a chemical reaction. Rama : Matter is conserved in a chemical reaction. 

A) Uma is correct, Rama is incorrect.

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Chemical reactions which occur in presence of sunlight are called ………………. reactions.  A) Thermal 

C) Photo chemical

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Write down the overall chemical reaction of a process in which glucose in broken down to two molecules of pyruvic acid.

Overall reaction of glycolysis:  Glucose + 2 ATP + 2iP + 4 ADP + 2 NAD+ → 2 Pyruvate + 2 ADP + 4 ATP + 2 NADH + 2 Ha+...

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Proteins are broken down into Peptones by the action of 

The correct answer is (A) Pepsin

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