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Q:

Metal oxides which react with acids as well as bases are called

A) Amphoteric oxides B) Neutral oxides
C) Basic oxides D) Acidic oxides
 
Answer & Explanation Answer: A) Amphoteric oxides

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Q:

Which of the following is used to get relief when you have been stung by a honeybee?

A) Common salt B) Baking soda
C) Acetic acid D) Washing soda
 
Answer & Explanation Answer: B) Baking soda

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Q:

What are stars primarily made of?

A) Oxygen and Hydrogen B) Hydrogen and Carbon
C) Hydrogen and Helium D) Oxygen and Helium
 
Answer & Explanation Answer: C) Hydrogen and Helium

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Q:

The hardest natural substance is

A) Graphite B) Diamond
C) Iron D) Copper
 
Answer & Explanation Answer: B) Diamond

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Q:

Which of the following metals does NOT react with cold or hot water?

A) Aluminium B) Potassium
C) Sodium D) Calcium
 
Answer & Explanation Answer: A) Aluminium

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Q:

Which term describes an enzyme?

A) reactant B) catalyst
C) substrate D) product
 
Answer & Explanation Answer: B) catalyst

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Q:

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

A) Strong acids react very rapidly with other substances (such as metal carbonates and metal hydrogen carbonates) B) Hydrochloric acid, Sulphuric acid and Nitric acid are strong acids
C) Acids are those chemical substances that have a salty taste D) All minerals acids are strong acids
 
Answer & Explanation Answer: C) Acids are those chemical substances that have a salty taste

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Q:

Given in the options are sets of particular characteristics of elements and how they vary across the period and down the group in the following format:

 

Characteristic of an element  -  Across the period  -  Down the group

 

 

A) Electropositive Character/metallic character - Increase - Decrease B) Electropositive Character/metallic character - Increase - Increase
C) Electropositive Character/metallic character - Decrease - Increase D) Electropositive Character/metallic character - Decrease - Decrease
 
Answer & Explanation Answer: C) Electropositive Character/metallic character - Decrease - Increase

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