3909. Color of nitric acid is light yellow due to the presence of
NO
NO₂
N₂H₅
NH₃
✅ The correct answer is option B.
3913. Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talchar (Orissa)
Use coal for heating purpose
Gasify coal to get hydrogen from coal gas
Use coal as filler in fertiliser
Use coal as conditioner in fertiliser
✅ The correct answer is option B.
3918. Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
50-80
250-400
1000-1200
800-900
✅ The correct answer is option B.
3923. Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because
It is hygroscopic and explosive in nature
It is highly acidic in nature
It is a liquid at room temperature
Its nitrogen content is very less
✅ The correct answer is option A.
3928. Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at
Rourkela (under SAIL)
Bokaro (under SAIL)
Sindri (under FCI)
Baroda (under G.S.F.C.)
✅ The correct answer is option C.
3933. Ammonia synthesis reaction is
Exothermic
Endothermic
Autocatalytic
None of these
✅ The correct answer is option A.
3900. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the
A. Two temperatures only
B. Pressure of working fluid
C. Mass of the working fluid
D. Mass and pressure both of the working fluid
✅ The correct answer is option A.
3906. For a spontaneous process, free energy
A. Is zero
B. Increases
C. Decreases whereas the entropy increases
D. And entropy both decrease
✅ The correct answer is option C.
3910. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is
A. Less
B. More
C. Same
D. Dependent on climatic conditions
✅ The correct answer is option A.
3914. When pressure is applied on the system, ice ⟷ water, then
A. Equilibrium can not be established
B. More ice will be formed
C. More water will be formed
D. Evaporation of water will take place
✅ The correct answer is option C.