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- Question
A bond formed by sharing of electrons between atoms of the element is called
Options- A. ionic bond
- B. covalent bond
- C. co ordinate bond
- D. none
- Correct Answer
- covalent bond
- 1. Neutron was discovered by
Options- A. J.J.Thomson
- B. Chadwick
- C. Rrutherford
- D. Priestley Discuss
- 2. The Gas used for Artificial Ripening of Green Fruit is
Options- A. Acetone
- B. Di Carbonate
- C. Ethylene
- D. Ethyl Alcohol Discuss
- Calcium carbide is also used in some countries for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in its effects to the natural ripening agent, ethylene
- 3. How many Covalent Bonds can Nitrogen form
Options- A. 2
- B. 3
- C. 4
- D. 1 Discuss
- 4. Oxidation Number of 'S' in H2SO4 ?
Options- A. +6
- B. +2
- C. -6
- D. -2 Discuss
- 5. The oxidation number of Cr in K2Cr2O7 is
Options- A. +6
- B. -5
- C. +3
- D. -4 Discuss
- 6. Which of the following acts both as oxidising and reducing agent?
Options- A. nitric acid
- B. ammonia
- C. nitrous acid
- D. nitrogen peroxide Discuss
- 7. Blue litmus paper is converted into red in solution of _______
Options- A. Acid
- B. Base
- C. Alkali
- D. Salt Discuss
- 8. Group displacement law was given by
Options- A. Bacquerel
- B. Rutherford
- C. Mendeleaf
- D. Soddy and Fajan Discuss
- 9. In nuclear reactor the speed of neutrons is slowed down by
Options- A. heavy water
- B. ordinary water
- C. Zinc rods
- D. molten caustic soda Discuss
- 10. Ozone hole refers to
Options- A. Decrease in the thickness of ozone layer in Stratosphere
- B. Increase in thickness of ozone layer
- C. Decrease in the ozone layer in Troposphere
- D. Hole in the ozone layer Discuss
Chemistry problems
Search Results
Correct Answer: Chadwick
Correct Answer: Ethylene
Explanation:
Ethylene is used for Artificial Ripening of Green Fruit.
Correct Answer: 3
Explanation:
Nitrogen ( ) forms Three Covalent Bonds to become stable.
Here the Atmomic Number of Nitrogen is 7. Because there are 2 electrons in the first orbital and 5 in the second and you still have space for 3 more. So it shares, 3 to get the stable octet. Therefore, there are 3 covalent bonds in .
Correct Answer: +6
Explanation:
In ,
Hydrogen has a charge of +2, with each hydrogen has +1.
Oxygen has a charge of -8, with each oxugen has -2.
Total charge = (2 - 8) = -6
Therefore, the Oxidation number of Sulphur S is '+6' because to make the compound stable.
Correct Answer: +6
Explanation:
We will rewrite the formula as an equation.
2K + 2Cr + 7O = 0
The zero comes from there being no overall charge on the compound.
Each oxidation number is represented by the element's symbol.
Since this compound is not a peroxide or superoxide, the oxidation value for O is -2
K being in group 1 has a +1 charge and therefore has an oxidation number of K is +1
Now, by putting known values in we have:
2(+1) + 2(Cr) + 7(-2) = 0
2 + 2Cr -14 = 0
2Cr = +12
Cr = +6.
Correct Answer: nitrous acid
Explanation:
Nitrous acid act as an oxidising agent because it oxidises potassium iodide to iodine. It is also a reducing agent because it decolourises acidified potassium permanganate solution.
Nitric acid acts only as an oxidising agent
Ammonia acts only as a reducing agent
Nitrogen peroxide acts only as an oxidising agent.
Correct Answer: Acid
Correct Answer: Soddy and Fajan
Correct Answer: heavy water
Correct Answer: Decrease in the thickness of ozone layer in Stratosphere
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