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The phrase "could not able to" is incorrect. The word "could" already implies the ability or inability to do something. Therefore, the correct phrase is "was not able to."
Which gas is commonly used in electric bulbs to prevent oxidation?
The conversion of hard water into soft water by boiling or adding calcium hydroxide is called:
Which of the following is not a natural polymer?
Which gas is evolved during the reaction of an acid with a metal?
To prevent heart problems, blood of a normal healthy person should have
What is heavy water?
White phosphorus is stored in which of the following substances?
Sphagnum is an important bryophyte. Consider the following statements about it:
Which type of wave does not require a medium for propagation?
Bleaching Powder is a compound of _______?