Which one of the following statements is NOT correct?
The higher the hydrogen ion concentration in a solution, higher is its pH
Correct Answer: (b) The higher the hydrogen ion concentration in a solution, higher is its pH
Explanation: The pH scale works inversely: the higher the hydrogen ion concentration in a solution, the lower its pH value.
Which one of the following methods can be used to separate anthracene from a mixture of salt and anthracene ?
Which one of the following is called dry ice?
Which one of the following statements about the law of conservation of mass is correct?
Which among the following are essential constituents of Portland cement?
Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are
The compound C6H12 O4 contains________.
Which one of the following is a non-metallic mineral?
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of
How much CO 2is produced on heating of 1 kg of carbon?
20 g of common salt is dissolved in 180 g of water. What is the mass percentage of the salt in the solution?
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: