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Q:

In modern periodic table while going from top to bottom in a group ______.

 

A) size of an atom increases B) size of an atom decreases
C) ionisation energy of an atom increases D)  size and ionisation energy of an atom increases

Answer:   D)  size and ionisation energy of an atom increases



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Subject: Chemistry
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Which of the following statements is wrong with regard to strong acids?

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Answer & Explanation Answer: C) Acids are those chemical substances that have a salty taste

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Answer & Explanation Answer: A) Hydracids

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What is the percentage of methane in biogas?

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Answer & Explanation Answer: D) 75%

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What are stars primarily made of?

A) Oxygen and Hydrogen B) Hydrogen and Carbon
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Which of the following is not a greenhouse gas?

A) Carbon dioxide B) Methane
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Answer & Explanation Answer: D) Oxygen

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Dissolving is best described as

 

A) molecules breaking into ions B) a change from a solid to a liquid
C) breaking covalent bonds D) a mingling of molecules and/or ions
 
Answer & Explanation Answer: D) a mingling of molecules and/or ions

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What is the chemical formula of Ozone?

A) O B) O2
C) O3 D) O4
 
Answer & Explanation Answer: C) O3

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What is the chemical name of chalk?

A) Calcium Sulphate B) Calcium Nitrate
C) Calcium Carbonate D) Calcium Phosphide
 
Answer & Explanation Answer: C) Calcium Carbonate

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