chemistry general-knowledge question and answers -Page 21

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Chemistry problems

1. 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

Discuss

Correct Answer: covalent bond

2. Which of the following acts both as oxidising and reducing agent?
Options
A. nitric acid
B. ammonia
C. nitrous acid
D. nitrogen peroxide

Discuss

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.

3. Blue litmus paper is converted into red in solution of _______
Options
A. Acid
B. Base
C. Alkali
D. Salt

Discuss

Correct Answer: Acid

4. Group displacement law was given by
Options
A. Bacquerel
B. Rutherford
C. Mendeleaf
D. Soddy and Fajan

Discuss

Correct Answer: Soddy and Fajan

5. 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

Correct Answer: heavy water

6. 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

Also asked in:

Correct Answer: Decrease in the thickness of ozone layer in Stratosphere

7. Is Osmosis Active or Passive?

Also asked in:

Correct Answer: Osmosis is the process in which water molecules move from a region of higher water potential to a region of lower potential down a water potential gradient across a partially permeable membrane It doen't requires any additional energy to do this work So, Osmosis is a Passive Active and passive transport processes are two ways molecules and other materials move in and out of cells and cross intracellular membranes 1 Active transport is the movement of molecules or ions against a concentration gradient (from an area of lower to higher concentration), which does not ordinarily occur, so enzymes and energy are required 2 Passive transport is the movement of molecules or ions from an area of higher to lower concentration Passive transport occurs because of the entropy of the system, so additional energy isn't required for it to occur 3 Active transport requires energy to proceed, while passive transport does not require the input of extra energy to occur

8. Tetraethyl lead is used as
Options
A. Fire extinguisher
B. Gasoline additive
C. Mosquito repellent
D. Pain killer

Also asked in:

Correct Answer: Gasoline additive

Explanation:

Tetraethyl lead is a highly toxic compound used as a gasoline additive.

Tetraethyl lead abbreviated as TEL, is an organo lead compound with the formula (CH₃CH₂)₄Pb. It is a petro-fuel additive which in turn caused increased vehicle performance. This is also used as an antiknock agent in gasoline and jet fuels. Tetraethyl lead is absorbed rapidly by the skin, the lungs, and the gastrointestinal tract. It is converted to triethyl lead, which might be responsible for its toxicity.