CO2 is gas while SiO2 is solid at room temperature?

Related Mcqs:

1. In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?

   A. 4
   B. 2
   C. 1
   D. 6

2. Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________?

   A. acetylene
   B. N-hexane
   C. Benzene sulphonic acid
   D. Sodium benzoate

3. Which one has the lowest density at room temperature ?

   A. Ne
   B. N2
   C. NH3
   D. CO

4. If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature exis at________________?

   A. 0?C
   B. 273.16K
   C. ?273.16 K
   D. ?273.16?C

5. Concentration of solute molecule when they are in equilibrium with solid substance at particular temperature is called________________?

   A. saturated solution
   B. solubility
   C. unsaturated solution
   D. super saturated solution

6. One mole of CO2 contains?

   A. 6.022 x 1023 atoms of oxygen
   B. 22-gram electrons
   C. 6.022 x 1023 atms of carbon
   D. both B. & C.

7. The number of moles of CO2 which contains 16 g of oxygen is__________________?

   A. 0.25
   B. 0.5
   C. 0.75
   D. 1

8. Which of the following is the best explanation that CO2 is non polar molecule __________________?

   A. Linear geometry
   B. Dipole moment is zero
   C. Sp hybridization
   D. None

9. What is the relative rate of effusion of CO and CO2 ?

   A. CO is 1.25 times faster than CO2
   B. CO is 3.75 times faster than CO2
   C. CO is 1.25 times faster than CO
   D. Both diffuse at the same rate

10. When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is _________________?

    A. propane
    B. propanoic acid
    C. propanal
    D. propanol