Discussion
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- Question
Cementite is
Options- A. Fe3C chemically.
- B. a compound of carbon and iron.
- C. characterised by an orthorhombic crystal structure.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. The increase in the rate of reaction with temperature is due to
Options- A. increase in the number of effective collisions.
- B. decrease in activation energy.
- C. increase in the average kinetic energy of the reacting molecules.
- D. none of these. Discuss
- 2. For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.
Options- A. 8
- B. 12
- C. 16
- D. 32 Discuss
- 3. The fractional volume change of the system for the isothermal gas phase reaction, A → 3B , between no conversion and complete conversion is
Options- A. 0.5
- B. 1
- C. 2
- D. 3 Discuss
- 4. A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
Options- A. both conversion as well as concentration are same
- B. conversion in both will be the same but concentrations will be different
- C. both the conversion as well as concentrations will be different
- D. none of these. Discuss
- 5. For the irreversible elementary reactions in parallel viz
, the rate of disappearance of 'X' is equal to
Options- A. CA(K1+K2)
- B. CA(K1 + K2)/2
- C. CA . K1/2
- D. CA . K2/2 Discuss
- 6. Refined acetic acid storage vessel are made of
Options- A. copper
- B. aluminium
- C. high carbon steel
- D. nickel Discuss
- 7. Which of the following crystal structures characterises the austenitic stainless steel?
Options- A. Simple hexagonal
- B. Body centred cubic
- C. Face centred cubic
- D. None of these Discuss
- 8. Cermets are __________ materials.
Options- A. refractory
- B. reinforced
- C. abrasive
- D. fully metallic Discuss
- 9. Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
Options- A. moving mercury and graphite.
- B. graphite and moving mercury.
- C. moving mercury and carbon.
- D. moving mercury and crimped steel wire. Discuss
- 10. The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability?
Options- A. Lead
- B. Copper
- C. Aluminium
- D. Wrought iron Discuss
Materials and Construction problems
Search Results
Correct Answer: decrease in activation energy.
Correct Answer: 16
Correct Answer: 2
Correct Answer: conversion in both will be the same but concentrations will be different
Correct Answer: CA(K1+K2)
Correct Answer: aluminium
Correct Answer: Face centred cubic
Correct Answer: refractory
Correct Answer: graphite and moving mercury.
Correct Answer: Lead
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