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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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The most active ingredient in bleaching powder is

A) Iodine B) Calcium hypochlorite
C) Nitric acid D) Ammonium sulphate
 
Answer & Explanation Answer: B) Calcium hypochlorite

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Which of the following elements was the last element in Newland's Law of Octaves?

A) Thorium B) Hydrogen
C) Rubidium D) Bromine
 
Answer & Explanation Answer: A) Thorium

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_____ is the most ductile metal.

A) Ph B) C
C) Au D) Ag
 
Answer & Explanation Answer: C) Au

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Which of the following is not a constituent of biogas?

A) Carbon dioxide B) Hydrogen Sulphide
C) Methane D) Carbon Monoxide
 
Answer & Explanation Answer: A) Carbon dioxide

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Q:

An element A forms an oxide with formula A3O4. What is the valency of element A?

A) 3 B) 2
C) 1 D) 4
 
Answer & Explanation Answer: D) 4

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0 1037
Q:

Select the INCORRECT set of Molecular Formula - IUPAC Name - Common Name from the following options.

A) C4H9OH B) C2H3OH - Methanol - Methyl Alcohol
C) C2H5OH - Ethanol - Ethyl Alcohol D) C3H7OH - Propanal - Propyl Alcohol
 
Answer & Explanation Answer: B) C2H3OH - Methanol - Methyl Alcohol

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Q:

The maximum number of electrons that can be accommodated in a shell is indicated by the formula

A) 2n-2 B) 2n3
C) 2n D) 2n2
 
Answer & Explanation Answer: D) 2n2

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0 689
Q:

Select the option that correctly matches the contents of the first column with the contents of the second column.

 

A. Elements combine in fixed ratios I. Dalton's atomic theory
B. Atoms are indivisible II. The same number of molecules
C. Sulphate and Oxalate ions are anions, whereas magnesium and III. Law of constant proportions
D. Gram atomic mass of an element and the gram molecular mass of a compound contain IV. Ammonium ions are cations

 

A) A-III, B-II, C-IV, D-I B) A-III, B-I, C-IV, D-II
C) A-III, B-IV, C-I, D-II D) A-I, B-III, C-IV, D-II
 
Answer & Explanation Answer: B) A-III, B-I, C-IV, D-II

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