A chemical that donates proton (hydrogen ion) is called
Acid
A substance that donates a proton (H+ ion) to another substance is defined as an acid, as per the Bronsted-Lowry concept of acids and bases.
Which one of the following elements is used as a timekeeper in atomic clocks?
Vitamin B 12 deficiency causes pernicious Anemia. Animals cannot synthesize vitamin B 12 . Humans must obtain all their vitaminB 12 from their diet. The complexing metal ion in vitamin B 12 is:
What is the number of atoms in 46 g of sodium-23 (N = Avogadro constant)?
Very small insoluble particles in a liquid may be separated from it by using ________.
Which of the following statements about universal indicator is/are true ?
1. It is a mixture of several indicators.
2. It shows different colours at different concentrations of hydrogen ions in solution.
3. It helps to determine the strength of given acid and base in titration.
Select the correct answer using the code given below :
Which one of the following statements is NOT correct?
The valency of phosphorus is ________.
A mixture of sodium chloride (salt) and ammonium chloride can be separated by _________.
There are two elements - calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as
The mass of one mole of a substance in grams is called its
Which of the following pair is correct?
I. Isotopes – different mass numbers
II. Isobars – different atomic numbers
Which of the following is a zone of a flame?
I. Dark
II. Luminous
III. Non-Luminous
The volume of CO 2liberated at STP when 10 gm of 90% pure limestone strongly heated is
Water can dissolve more substances than any other liquid because
An alloy is: