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Which of the following statements made by Dalton has not undergone any change?
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In all atoms of an element
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______ is the smallest particle of an element.
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An element is composed of ______ atoms.
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Define the term ions or radicals.
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Water is colourless, odourless and _______.
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Acids are ________ in taste.
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In acidic solutions blue litmus changes into ______ colour.
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Acid mixed with base forms ______.
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The word sour refers to ______ in Latin.
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Most of the acids are not soluble in water.
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Acids are bitter in taste.
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Acids are corrosive in nature.
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What are the uses of acids?
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Vinu and Priyan take their lunch at school. Vinu eats lemon rice and Priyan eats curd rice. Both lemon rice and curd rice are sour in taste. What is the reason?
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Heshna and Keerthi are friends. Keerthi’s teeth are white without caries, but Heshna has teeth with caries. Why? How is it formed?
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What do you mean by catenation?
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Deforestation means ______.
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What is known as extint species?
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