Q1. Which of the following is the purest form of water.
(a) River Water
(b) Rain Water
(c) Lake Water
(d) Sea Water
Q2. Which of the following is only and important ore of Mercury
Q3. Which of the following is not an Alkali metal ?
(a) Li (lithium)
(b) Na (Sodium)
(c) Rubidium (Rb)
(d) Chromium (Cr)
Q4. Fog, clouds and mist are examples of–
(b) Solid sol
Q5. A polymer used for making non-stick surface Coating for tersely are –
(a) Polyvinyl Chloride
(d) Poly Propylene
Q6. What is “milk of magnesia” chemically
(a) Magnesium carbonate
(b) Sodium bicarbonate
(c) Calcium hydroxide
(d) Magnesium hydroxide
Q7. Who is regarded as the father of modern chemistry
(b) Albert Einstein
(c) Antoine Lavoisier
(d) C. V. Raman
Q8. When ENO Salt is poured. In to water, bubbles borns which is due to–
(a) O2 gas
(b) CO2 gas
(c) CO gas
(d) H2 gas
Q9. Soap is prepared by boiling caustic soda with
(b) Kerosene oil
Q10. Bronze is an alloy of
(a) Copper and Zinc
(b) Tin and Zinc
(c) Copper and Tin
(d) Iron and Zinc
Sol.Rain Water is the Purest form of water since it is condensed water vapor of the air.
It is soft water because it does not contain salt like bicarbonates, sulphates, and chlorides of calcium, and magnesium.
Sol. Lithium (Li), Sodium (Na), Potassium (k), Rubidium (Rb), Cesium (Cs) and Farnum (Fr) are called alkali metals since they readily dissolve in water to form strong alkaline Hydrocodes.
Sol. An aerosol is a colloid of fine solid particles or liquid droplets, in air or another gas.
Eg. Natural aerosols are fog, dust, Clouds, mist and geyser steam.
Sol. Poly tetrafluoroethylene (PT FE) is usually known as Teflon. This is especially used for making a non-stick surface Coating for utensils.
Sol. Antoine Lavoisier is considered the father of modern chemistry.
Sol. When Eno Salt is disowned in Water the Carbon di-oxide gas is produced Which produces bubbles.