Practice Question and Answer
8Q: What is the oxidation number of carbon in NaHCO3? 2326 05b5cc60de4d2b4197774b627
5b5cc60de4d2b4197774b627- 1-4false
- 2-3false
- 3+4true
- 4+2false
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Answer : 3. "+4"
Explanation :
Answer: C) +4 Explanation: The given compound is NaHCO3 Sodium bicarbonate which is commonly known as Baking soda. Oxidation numbers are the charges on ions. When a neutral atom loses electrons it becomes positively charged. When a neutral atom gains electrons it becomes negatively charged. Here the C represents the oxidation state of carbon in this compound. Compounds are electrically neutral, which is why we set the sum of the oxidation states equal to zero. Sodium has a +1 oxidation state. Hydrogen has a +1 oxidation state. Oxygen has a -2 oxidation state. There are three oxygen atoms, which means the total oxidation state provided by both oxygen ions is -6. Adding up these oxidation states we get: 1 + 1 + (-6) + C = 0 -4 + C = 0 => C = 4 This means the oxidation state of carbon in this compound is +4.
Q: What has two hands but no arms or legs? 2326 05b5cc68be4d2b4197774c396
5b5cc68be4d2b4197774c396- Show AnswerHide Answer
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Answer :
Explanation :
A Clock has 3 hands i.e, an Hour hand, a Minute hand and a Seconds hand.
Q: Which one of the following is elected as the national microbe of India. 2326 05c98687dbcc942443bf4aa9a
5c98687dbcc942443bf4aa9a- 1Bacillus Thurigiensisfalse
- 2Lactobacillustrue
- 3Yeastfalse
- 4Acetobacterfalse
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Answer : 2. "Lactobacillus"
Q:Directions: In the question, a sentence has been given in Active / Passive Voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive / Active Voice and mark your answer in the Answer Sheet.
Can we rely on him?
2326 05f32634073567c6159144e05
5f32634073567c6159144e05- 1Can he be relied by us?false
- 2Can we be relied on by him?false
- 3Can he be relied on?true
- 4Can we be relied by him?false
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Answer : 3. "Can he be relied on?"
Q: The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average one number, namely 36, was wrongly read as 26. The correct average is:
2326 05f2a90a3a5ce9779bd29b969
5f2a90a3a5ce9779bd29b969- 116true
- 214false
- 320false
- 418false
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Answer : 1. "16 "
Q: Alex sold his goods after announcing two successive discounts of 30% each. The effective discount altogether is-
2325 065646d2ed75b9125c24b53a2
65646d2ed75b9125c24b53a2- 152%false
- 249%false
- 350%false
- 451%true
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Answer : 4. "51%"
Explanation :
Q: If ROSE is coded as 6821, CHAIR is 73456 and PREACH is coded as 961473, then what will be the code of SEARCH?
2325 06391dcdbb13d3250d326965a
6391dcdbb13d3250d326965a- 1246173false
- 2214673true
- 3214763false
- 4216473false
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Answer : 2. "214673"
Q: France-based Thomson has sold its Italian tubes manufacturing plant to an Indian company. Identify the company. 2325 05b5cc7c3e4d2b41977750b15
5b5cc7c3e4d2b41977750b15- 1BPLfalse
- 2Mirc Electronicsfalse
- 3Videocontrue
- 4Godrejfalse
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Answer : 3. "Videocon"
Explanation :
Answer: C) Videocon Explanation: