Answer: Option (a) is the correct answer.
Explanation:
Sodium bromide (NaBr) is an ionic salt as it is formed by transfer of an electron from sodium to bromine atom.
Whereas 
, HCN, 
and 
are all covalent compounds. And, all of them exists as a gas at room temperature.
Also according to rate of diffusion law, rate of diffusion is inversely proportional to square root of molecular weight of gas.
Mathematically, Rate of diffusion = 
Out of the given options NaBr has the highest molecular weight which is 102.894 g/mol.
Thus, we can conclude that NaBr is most likely not a gas at room temperature.
Acrylonitrile is a chemical compound with the formula C₃H₃N. This coloress liquid often appears yellow due to impurities.
Answer:
Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Answer:
QED, EDQ, DQE, EQD, DEQ, QDE
Explanation:
The structure of all possible peptides that contain the given amino acids are :
QED, EDQ, DQE, EQD, DEQ, QDE
where : Asp is represented by the letter code D
Glu is represented by the letter code E
Gln is represented by the letter code Q
Note : when three amino acids combine they form what is known as tripeptide ( i.e. contains two peptide linkages ) while a peptide linkage is been formed by the combination of a carboxyl group of an amino acid and the amino group of different amino acid
The Greeks cataloged rocks and minerals around 200 BCE. Good luck!
