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Cleanliness is a state of being clean and we are talking rather about a process of cleaning the office. Hence ‘cleaning’ is correct. ‘Clean’ is also correct but had the sentence been talking about a random kind of cleaning such as ‘a proper’, option d would have been correct. ‘To clean’ is incorrect as we need a noun and not a verb.
The product of the equivalent weight and valency of an element equals its ______.
Which of the following is used as a moderator in nuclear reactors?
The atomic bomb is based on which principle?
Alkali metals have ______.
I. low melting points
II. low densities
The two metal ions that cause hardness to water are……………?
Which acid is present in grapes?
Biofertilizers convert nitrogen to:
Marble is a metamorphic rock of:
The motion of an object under free fall is an example of which of the following?
Flemings right hand rule is used to find the direction of the –
