Q1. Which of the following is an ore of Aluminium?
(d) Epsom Salt
Q2. Process of gaining electrons is known as _____.
(d) both oxidation and reduction
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Q3. Which of the following metal (shown by its symbol) is generally used for making filaments of bulb?
Q4. Who invented Dynamite?
(a) J B Dunlop
(b) Alfred Nobel
(c) James Simons
(d) Peter Hargreaves
Q5. A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.
(a) Six months
(b) Ten months
(c) Twelve Months
(d) Twenty four months
Q6. pH of the human blood is ______.
(a) Slightly Acidic
(b) Highly Acidic
(c) Slightly Basic
(d) Highly Basic
Q7. What is nature of pH of Milk?
(a) Slightly Acidic
(b) Slightly Basic
(c) Highly Acidic
(d) Highly Basic
Q8. Which among the following is not an example of emulsion?
(c) Whipped Cream
Q9. What is the common name of CaOCl2?
(a) Baking Powder
(b) Baking Soda
(c) Bleaching Powder
(d) Washing Soda
Q10. What is the common characteristic of the elements of the same group in the periodic table?
(a) Electrons in outer most shell
(b) Total number of electrons
(c) Total number of protons
(d) Atomic weight
Sol. Cryollite is an ore of aluminium, Galena is an ore of lead, Cinnabar is an ore of mercury and Epsom Salt is an ore of magnesium.
Sol. Reduction is the loss of oxygen from a molecule or the gaining of one or more electrons.
Sol. Most incandescent bulbs use tungsten (W) as a filament element. Tungsten is an inexpensive metal that has a long lifespan as a filament. It is a suitable option for incandescent bulbs because it has an extremely high melting point and is flexible. Pliable tungsten filaments are easily formed and hold up well against temperatures as high as 4,500 degrees Fahrenheit.
Sol. Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay) and stabilizers. It was invented by the Swedish chemist and engineer Alfred Nobel in Geesthacht, and patented in 1867. It rapidly gained wide-scale use as a safer alternative to black powder.
Sol. Half life of any radioactive substance is the amount of time required for the quantity / weight of the substance to fall to half its initial value.So after one half life , we will have ½ or 50% of the substance remaining. And after 2 half lives , we will have ¼ of the substance remaining. In other words, ¾ of the substance will take two half lives to decay.As one half life is given as 6 months , so the substance will take 12 months to decay by ¾ th quantiy by weight.
Sol. Human Blood pH is regulated to stay within the narrow range of 7.35 to 7.45, making it slightly basic.
Sol. Milk has a pH of around 6.5 to 6.7, which makes it slightly acidic.
Sol. An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Except Curd all other are example of emulsion.
Sol. Calcium hypochlorite is an inorganic compound with formula CaOCl2. As a mixture with lime and calcium chloride, it is marketed as chlorine powder or bleach powder for water treatment and as a bleaching agent. Common name of CaOCl₂ is Bleaching Powder.
Sol. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
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