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



Explanation:
Subject: Chemistry
Exam Prep: Bank Exams
Q:

How many moles are there in 140g of Si (atomic mass of silicon is 28)

A) 5 B) 10
C) 28 D) 140
 
Answer & Explanation Answer: A) 5

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Filed Under: Chemistry

43 12334
Q:

Positive ions are formed from neutral atoms by loss of

A) neutrons B) protons
C) nuclear charge D) electrons
 
Answer & Explanation Answer: D) electrons

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21 8774
Q:

The absolute value of charge on electron was determined by

A) J.J.Thomson B) R.A. Millikan
C) Rutherford D) Chadwick
 
Answer & Explanation Answer: B) R.A. Millikan

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59 17151
Q:

Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen

A) Laws of conservation of mass B) Laws of multiple proportion
C) Laws of reciprocal proportions D) Law of definite proportions
 
Answer & Explanation Answer: B) Laws of multiple proportion

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5 4212
Q:

An element X forms an oxide XO_{_{3}}, what ihe valency of X

A) 1 B) 2
C) 3 D) 6
 
Answer & Explanation Answer: D) 6

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3 3489
Q:

Which one of the following elements is the poorest conductor of heat

A) sodium B) lead
C) zinc D) mercury
 
Answer & Explanation Answer: B) lead

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45 13712
Q:

Which one among the following is the heaviest

A) 1 mole of water molecules B) 1 mole of ammonia molecules
C) 1 mole of sodium atoms D) 1 mole of hydrogen molecules
 
Answer & Explanation Answer: C) 1 mole of sodium atoms

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30 12390
Q:

How many electrons are there in Na+

A) 1 B) 10
C) 11 D) 12
 
Answer & Explanation Answer: B) 10

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47 16300