Practice Question and Answer

Q: What is the oxidation number of carbon in NaHCO3? 2052 0

  • 1
    -4
    Correct
    Wrong
  • 2
    -3
    Correct
    Wrong
  • 3
    +4
    Correct
    Wrong
  • 4
    +2
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

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:

यदि DE‖BC, AD:DB=5:3  है तो का DE|BC मान क्या होगा?

2052 0

  • 1
    $${5\over8} $$
    Correct
    Wrong
  • 2
    $${2\over3} $$
    Correct
    Wrong
  • 3
    $${3\over4} $$
    Correct
    Wrong
  • 4
    $${5\over3} $$
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 1. "$${5\over8} $$"

Q:

आईएमएफ के अनुसार, 2019 में भारत की अनुमानित वृद्धि में से कौन सा अनुसरण है?

2052 0

  • 1
    7.2%
    Correct
    Wrong
  • 2
    7.4%
    Correct
    Wrong
  • 3
    6.5%
    Correct
    Wrong
  • 4
    8.2%
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 2. "7.4%"

  • Show AnswerHide Answer
  • Workspace

Answer : 2. "दक्षिण-पूर्व"

Q:

किस राज्य ने मिशन शक्ति खेल पहल शुरू की है?

2051 2

  • 1
    महाराष्ट्र
    Correct
    Wrong
  • 2
    राजस्थान
    Correct
    Wrong
  • 3
    असम
    Correct
    Wrong
  • 4
    आंध्र प्रदेश
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 1. "महाराष्ट्र"

Q:

निम्नलिखित में से किसने सिख गुरुओं ने अमृतसर की नींव रखी थी?

2051 1

  • 1
    गुरु अमर दास
    Correct
    Wrong
  • 2
    गुरु राम दास
    Correct
    Wrong
  • 3
    गुरु अर्जन देव
    Correct
    Wrong
  • 4
    गुरु हर गोविंद
    Correct
    Wrong
  • Show AnswerHide Answer
  • Workspace

Answer : 2. "गुरु राम दास"

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully

      Report Error

    Please Enter Message
    Error Reported Successfully