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- Question
Which of the following is a commercial source of energy?
Options- A. Agricultural waste
- B. Dried dung
- C. Sun
- D. Natural gas
- Correct Answer
- Natural gas
- 1. When Granite rocks get metamorphosed, they form
Options- A. Quartzite
- B. Gneiss
- C. Marble
- D. Slate Discuss
- 2. Besides CO2, the other green house gas is
Options- A. CH4
- B. N2
- C. Ar
- D. O2 Discuss
- 3. Process of gaining electrons is known as _____.
Options- A. oxidation
- B. reduction
- C. radiation
- D. both oxidation and reduction Discuss
- 4. Which one of the following statements regarding histone proteins is correct?
Options- A. Histones are proteins that are present in mitochondrial membrane
- B. Histones are proteins that are present in nucleus in association with DNA
- C. Histones are proteins associated with lipids in the cytosol
- D. Histones are proteins associated with carbohydrates in the cytosol Discuss
- 5. The PCl5 molecule has trigonal bipyramidal structure. Therefore,the hybridization of p orbitals should be
Options- A. sp2
- B. sp3
- C. dsp2
- D. dsp3 Discuss
- 6. Which one of the following elements is used as a timekeeper in atomic clocks?
Options- A. Potassium
- B. Caesium
- C. Calcium
- D. Magnesium Discuss
- 7. Which one of the following gases dissolves in water to give acidic solution?
Options- A. Carbon dioxide
- B. Oxygen
- C. Nitrogen
- D. Hydrogen Discuss
- 8. Consider the following chemical reaction : aFe2O3(s) + bCO(g) + cFe(s) + dCO2 In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?
Options- A. 3, 2, 3, 1
- B. 1, 3, 2, 3
- C. 2, 3, 3, 1
- D. 3, 3, 2, 1 Discuss
- 9. Why is argon gas used along with tungsten wire in an electric bulb?
Options- A. To increase the life of the bulb
- B. To reduce the consumption of electricity
- C. To make the emitted light colored
- D. To reduce the cost of the bulb Discuss
- 10. Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (fc)?
Options- A. These are two independent temperature scales
- B. T = tc
- C. T = tc - 273.15
- D. T = tc + 273.15 Discuss
Chemistry problems
Search Results
Correct Answer: Gneiss
Correct Answer: CH4
Correct Answer: reduction
Correct Answer: Histones are proteins that are present in nucleus in association with DNA
Explanation:
Histones are highly alkaline proteins found in eukaryotic cell nucleusthat package and order the DNA into structural units called nucleosomes. They are the chief protein components of chromatin, acting as spools around which DNA winds, and playrole in gene regulation.
Correct Answer: dsp3
Explanation:
The P atom needs five orbitals to form the five P-Cl bonds. It has a 3s and three 3p orbitals, so it must use one of its 3d orbitals to form the fifth bond. These orbitals are hybridized to form five sp3d orbitals that just happen to point in the right directions to form a trigonal bipyramid.
Correct Answer: Caesium
Explanation:
When exposed to certain frequencies of radiation, such as radio waves, the subatomic particles called electrons that orbit an atom's nucleus will "jump" back and forth between energy states. Clocks based on this jumping within atoms can therefore provide an extremely precise way to count seconds.It is no surprise then that the international standard for the length of one second is based on atoms. Since 1967, the official definition of a second is 9,192,631,770 cycles of the radiation that gets an atom of the element called caesium to vibrate between two energy states.
Correct Answer: Carbon dioxide
Explanation:
Carbon dioxide (CO2) gas dissolved in water can cause water to become acidic.The acidity of water from dissolved CO2 can be reduced by a base such as baking soda (sodium bicarbonate).
Correct Answer: 1, 3, 2, 3
Explanation:
Fe2O3 + 3CO = 2Fe + 3CO2
Hematite + Carbon Monoxide = Iron + Carbon Dioxide
In this reaction, the iron oxide is reduced to iron, and the carbon is oxidised to carbon dioxide.
Correct Answer: To increase the life of the bulb
Explanation:
Argon gas is used in fluorescent and incandescent light bulbs to stop the oxygen in the light bulbs from corroding the hot tungsten filament.
The use of argon in light bulbs prevents the evaporation of the tungsten filaments, which results in increased light bulb life.
Argon is also used to create an inert atmosphere for growing semiconductor crystals, arc welding and for processes that need protection from other kinds of atmospheric gases.
Correct Answer: T = tc + 273.15
Explanation:
Lord Kelvin, working in Scotland, developed the Kelvin scale in 1848. His scale uses molecular energy to define the extremes of hot and cold. Absolute zero, or 0 K, corresponds to the point at which molecular energy is at a minimum. The Kelvin scale is preferred in scientific work, although the Celsius scale is also commonly used. Temperatures measured on the Kelvin scale are reported simply as K, not °K.
T (in °C) + 273.15 = T (in K)
T (in K) ? 273.15 = T (in °C)
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