3
Q:

Which of the following group is NOT Dobereiner Triads?

 

A) Li, Na, K B) N, P Au
C) Cl, Br, I D) Ca, Sr, Ba

Answer:   B) N, P Au



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Subject: Chemistry
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Q:

What was the element used in traditional thermometers which is highly toxic in nature?

A) Carbon B) Mercury
C) Arsenic D) Cadmium
 
Answer & Explanation Answer: B) Mercury

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2 718
Q:

30 litres of salt solution contains 5% salt. How many litres of water must be added so as to get a resultant solution containing 3%salt?

A) 20 litres B) 25 litres
C) 30 litres D) 35 litres
 
Answer & Explanation Answer: A) 20 litres

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0 1075
Q:

What is the name of the process where gas is directly converted to solids called?

A) Sublimation B) Deposition
C) Condensation D) Evaporation
 
Answer & Explanation Answer: B) Deposition

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2 775
Q:

Non-metallic character increases from ____.

A) Magnesium to Barium B) Potassium to Caesium
C) Oxygen to Selenium D) Sodium to Chlorine 
 
Answer & Explanation Answer: D) Sodium to Chlorine 

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0 654
Q:

15% of an alloy was silver. If in a quantity of alloy there was 51 g of silver, what was the quantity of the other elements in the alloy?

A) 204 g B) 340 g
C) 300 g D) 289 g
 
Answer & Explanation Answer: D) 289 g

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0 737
Q:

CuO + H2 ---> Cu + H2O. This equation is an example of

A) Oxidation B) Decomposition
C) Reduction D) Redox
 
Answer & Explanation Answer: D) Redox

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1 768
Q:

Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia?

A) 18 B) 17
C) 16 D) 15
 
Answer & Explanation Answer: B) 17

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1 731
Q:

Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of

A) Calcium Carbonate B) Barium Carbonate
C) Calcium Hydrogen Carbonate D) Calcium Oxide
 
Answer & Explanation Answer: A) Calcium Carbonate

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