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Q:

One of the techniques used for desalination of sea water is

A) Filtration B) Distillation
C) Evaporation D) Condensation
 
Answer & Explanation Answer: B) Distillation

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Q:

What is the Greenhouse Effect?

A) The fall in population of plants due to human activity B) It is the warming of earth's surface due to its atmosphere
C) The polluting effect of burning fossil fuels D) The heating of the atmosphere due to depletion of the ozone layer
 
Answer & Explanation Answer: B) It is the warming of earth's surface due to its atmosphere

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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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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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Q:

Which is the first metallic element in the Modern Periodic Table?

A) Li B) Na
C) He D) H2
 
Answer & Explanation Answer: A) Li

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Q:

In the process of ___, the iron is protected by a coating of zinc.

A) greasing B) alloying
C) galvanisation D) anodising
 
Answer & Explanation Answer: C) galvanisation

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Q:

Propyne and propene can be distinguished by

A) AgNO₃ in ammonia B) conc. H₂SO₄
C) dil. KMnO₄ D) Br₂ in CCl₄
 
Answer & Explanation Answer: A) AgNO₃ in ammonia

Explanation:

Propene, being an alkene, and propyne, being a alkyne, are distinguished using the common chemical tests namely ammoniacal silver nitrate or ammoniacal cuprous chloride. Ammoniacal silver nitrate is also called as Tollen's reagent.

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Q:

Name the Russian chemist who stated that the properties of elements are a periodic function of their atomic masses?

A) Markovnikov B) Zelinsky
C) Mendeleev D) Zaitsev
 
Answer & Explanation Answer: C) Mendeleev

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