Chemistry 5

Chemistry (Civil Service Examination), Questions and Answers, GK for UPSC, Bank PO & All Exams

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1. Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists: [2002]
List-I – List-II
(Oxidation number) – (The elements)
A. 2 – 1. Oxidation number of Mn in MnO2
B. 3 – 2. Oxidation number of S in H2S2O7
C. 4 – 3. Oxidation number of Ca in CaO
D. 6 – 4. Oxidation number of Al in NaAIH4 Codes:


2. Assertion: Synthetic detergents can lather well in hard water.
Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water. [2002]


3. Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group
Reason (R): In a group, the atomic radii generally increase from top to bottom. [2003]


4. An aqueous solution of copper sulphate is acidic in nature because the salt undergoes [2001]


5. Consider the following statements: Hard water is not suitable for [2000]
1. drinking
2. washing clothes with soap
3. use in boilers
4. irrigating crops
Which of these statements are correct?


6. Match List I with List II and select the correct answer using the codes given below the lists: [2000]
List-I- List-II
A. German silver – 1. Tin
B. Solder – 2. Nickel
C. Bleaching powder – 3. Sodium
D. Hypo – 4. Chlorine Codes:


7. Which one of the following materials is very hard and very ductile? [2000]


8. Aluminium surface are often ‘anodized’. This means the deposition of a layer of [2000]


9. Which one of the following statements is NOT correct? [2003]


10. Consider the following statements with reference to the periodic table of chemical elements: [2001]
1. Ionisation potential gradually decreases along a period
2. In a group of elements, electron affinity decreases as the atomic weight increases
3. In a given period, electronegativity decreases as the atomic number increases
Which of these statement (s) is/are correct?


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