Molecular mass of water (18g) means__________________?

Related Mcqs:

1. 18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ___________________?

   A. 8 B. 5.1 C. 6 D. one/fifty one...

2. Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?

   A. 20cm3/min B. 40cm3/min C. 160cm3/min D. 2.5cm3/min...

3. When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?

   A. lighter B. intermediate C. heavier D. are collected at same time...

4. By which method the molecular mass of benzene was determined as 78.108 ?

   A. Specific gravity method B. Vapour density method C. X-ray diffraction method D. Distillation methos...

5. A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?

   A. C2H6O B. C6H18O3 C. C6H12O6 D. C2H5O Submitted by: Muhammad Ali Kunbhar...

6. A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?

   A. C2H4 B. C3H6 C. C4H8 D. C5H10 Submitted by: Muhammad Ali Kunbhar...

7. Higher value of electron affinity means__________________?

   A. Atom will lose electron easily B. Atom will gain electron easily C. Atom may form di-positive ion D. The reason is unknown...

8. The word Alkali means__________________?

   A. Base B. Basic salt C. Ashes D. Spirit...

9. Mass spectrometer is used to determine Mass number of isotopes and___________________?

   A. Atomic number B. Relative abundance C. Electronic configuration D. All of the above...

10. A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

    A. 74% Fe B. 75% Fe C. 77% Fe D. 78% Fe Submitted by: Muhammad Ali Kunbhar...