Chemistry
The atomic masses of sulphur (S), oxygen (O), and helium (He) are approximately 32, 16, and 4 respectively.
Which of the following statements regarding the number of atoms in 32 g of sulphur, 16 g of oxygen, and 4 g of helium is correct?
P. 16 g of oxygen contains four times the number of atoms as 4 g of helium.
Q. 16 g of oxygen contains half the number of atoms as 32 g of sulphur.
- only P
- only Q
- both P and Q
- neither P nor Q
Related Questions
An aqueous solution of copper sulphate turns colourless on electrolysis. Which of the following could be the electrodes?
P. anode: copper; cathode: copper
Q. anode: platinum; cathode: copper
R. anode: copper; cathode: platinum
- only P
- only Q
- only R
- both Q and R
A compound P is heated in a test tube with sodium hydroxide solution. A red litmus paper held at the mouth of the test tube turns blue. Which of the following could compound P be?
- zinc sulphate
- copper sulphate
- ferrous sulphate
- ammonium sulphate
Ammonia gas is passed through quicklime and then collected in a jar. Red and blue litmus papers are placed in the jar. W, X, Y and Z are the four observations. Which of the above observations correctly shows the reaction of the litmus papers to ammonia?
Red litmus paper Blue litmus paper W turns blue remains blue X remains red remains blue Y remains red turns red Z turns blue turns red - W
- X
- Y
- Z
Glucose reacts with concentrated sulphuric acid to give a very pure form of carbon called sugar charcoal.
The reaction taking place is:
- oxidation
- combustion
- dehydration
- combination