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- Question
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at :
Options- A. 518 nm
- B. 1035 nm
- C. 325 nm
- D. 743 nm
- Correct Answer
- 743 nm
Explanation.
- 1. In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is 1) A2B5 2) A3B2 3) A2B3 4) A3B4
Options- A. Option 1
- B. Option 2
- C. Option 3
- D. Option 4 Discuss
- 2. Mg+O2=MgO Balance the above Chemical equation?
Options- A. 2Mg + O2 ----> 2MgO
- B. 2Mg + O ----> 2MgO
- C. 2Mg + O ----> MgO2
- D. 2Mg + O2 ----> MgO2 Discuss
- 3. TEL minimise the knocking effect when mixed with petrol, it acts as_______
Options- A. Positive catalyst
- B. Negative catalyst
- C. Auto catalyst
- D. Induced catalyst Discuss
- 4. Of the following elements, which one has the same oxidation state in all of its compounds?
Options- A. Hydrogen
- B. Fluroine
- C. Carbon
- D. oxygen Discuss
- 5. The law of constant proportions was enunciated by
Options- A. Dalton
- B. Berthelot
- C. Avogadro
- D. Proust Discuss
- 6. Recycled plant matter is known as ?
Options- A. Decomposed
- B. Carbide
- C. Compost
- D. None Discuss
- 7. Select the correct statement (s).
Options- A. When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (W) positive.
- B. When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of W is negative.
- C. Both (A) and (B)
- D. None of the above Discuss
- 8. Orlon is a polymer of
Options- A. Dacron
- B. Acrylonitrile
- C. Polyamide Nylon
- D. None of the above Discuss
- 9. The monomer of polythene is
Options- A. ethylene
- B. ethyl alcohol
- C. vinyl chloride
- D. ethanol Discuss
- 10. A pure substance can only be
Options- A. Compound
- B. an element
- C. an element or a compound
- D. a heterogeneous mixture Discuss
Chemistry problems
Search Results
Correct Answer: Option 1
Explanation:
;
So formula of compound is
i.e., .
Correct Answer: 2Mg + O2 ----> 2MgO
Explanation:
Given Equation is
Balancing the Chemical Equation is nothing but Conservation of Matter. As Matter is Neither created nor Destroyed, it must be conserved.
Here we have 1 Mg and 2 O on the left side and 1 Mg and 1 O on the right side
To balance that, add 1 Mg on the left side so that it becomes 2 Mg and 2 O on the left side
i.e,
Here it has 2 Mg & 2 O on the left side and 2 Mg and 2 O on the right side and the Chemical equation is Balanced.
Correct Answer: Negative catalyst
Correct Answer: Fluroine
Correct Answer: Proust
Correct Answer: Compost
Correct Answer: Both (and (B)
Correct Answer: Acrylonitrile
Explanation:
The monomeric unit of orlon polymer is Acrylonitrile. Orlon is also known as Polyacrylonitrile (PAN).
Correct Answer: ethylene
Correct Answer: an element or a compound
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