Select the number that can replace the question mark (?) in the following series.
69, 109, 159, 219, 289, ?
69 + 40= 109 109+50= 159 159+60= 219 219+70= 289 289+80= 369
Which of the following is an example of a colloidal solution?
Why is commercial nitric acid typically yellow or brown in color?
Which of the following statement is/are true?
I. Atomic radius increases in moving from left to right along a period.
II. Atomic size...
Which is the best fire-extinguisher?
Which of the following is an example of a heterogeneous mixture?
The process of converting a solid directly into its vapor is called:
The product of the equivalent weight and valency of an element equals its ______.
Which element is commonly used in nuclear reactors for producing electricity by nuclear fission?
The percentage of nitrogen in urea is :
What are diatoms?
