3781. Heating of orthophosphoric acid to about 900°C, produces
Metaphosphoric acid
Pyrophosphoric acid
No change in it
None of these
✅ The correct answer is option A.
Chemical Engineering
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3782. Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of
Comparatively higher pressure drop
High cost of the high pressure vessel used for the reactor
Higher pumping cost
Chances of entrainment and disturbance of catalyst bed
✅ The correct answer is option B.
3783. Isotopes of an element have different
mass number
electronic configuration
nuclear charge
chemical properties
✅ The correct answer is option A.
3784. In a nuclear explosion, the energy is released primarily in the form of __________ energy-
potential
thermal
kinetic
electrical
✅ The correct answer is option C.
3785. A boiling water reactor is the one, in which the
coolant water is allowed to boil in the core of the reactor.
coolant water, after being heated in the reactor core, generates steam in a boiler.
pressurised water is pumped into the core.
fuel and the coolant are thoroughly mixed to form a homogeneous solution.
✅ The correct answer is option A.
3786. In nuclear reactions, __________ number is conserved.
mass
atomic
both (a) & (b)
neither (a) nor (b)
✅ The correct answer is option C.
3787. In a homogeneous nuclear reactor, the __________ are mixed together.
fuel & coolant
fuel & moderator
coolant & moderator
none of these
✅ The correct answer is option B.
3788. Atoms with same number of neutrons, but different number of nucleons are called
isotones
isobars
isotopes
isoters
✅ The correct answer is option A.
3789. The ratio of atomic radius to its nuclear radius is about
105
108
1012
1015
✅ The correct answer is option A.
3790. Which one is different for the neutral atoms of the isotopes of an element ?
Atomic weights
Atomic numbers
Number of protons
Number of electrons
✅ The correct answer is option A.