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Q1. Brownish ﬁlm formed on iron when left in open is called?
Q2. The substances which have very low ignition temperature and can easily catch ﬁre with a ﬂame are called _____________ substances.
Q3. Which of the toxic heavy metals is found in modern tannery industries?
Q4. The main source of carbon monoxide is –
(a) Industrial process
(b) Agricultural activities
(c) Combustion of fossil fuels
(d) Solid waste disposal
Q5. Which of the following is used to decolourise Brown Sugar Solution is –
(b) Hydrochloric Acid
(d) None of these
Q6. The chemical formula of baking soda is:
Q7. Which one of the following pairs is not correctly matched?
(a) Dry ice : Solid carbon dioxide
(b) Mustard gas : Poisonous liquid used in chemical warfare
(c) Teflon : Polymer containing fluorine
(d) Fullerene : Organic compounds containing fluorine
Q8. The technique of chromatography is used to-
(a) Identify colour substances
(b) Determine the structure of substances
(c) Dry distillation of colouring substances
(d) Separate the substances from a mixture
Q9. The gas usually filled in the electric bulb with Argon is –
(c) Carbon dioxide
Q10. Which one of the following metals is accessed in the native state?
Sol. When iron is exposed to water or air over a period of time, the iron reacts with oxygen in the presence of moisture to form a reddish-brown chemical compound, iron oxide. This is referred to as rust.
Sol. The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquified Petroleum Gas (LPG), etc.
Sol. Chromium is the toxic heavy metal and mainly found in waste from the chrome tanning process; it occurs as part of the retaining system and is displaced from leathers during retaining and dyeing processes.
Sol. The main source of carbon monoxide is burning of fossil fuel. The combustion of petroleum in automobiles is incomplete due to which smoke is produced. This smoke contains carbon monoxide.
Sol. A special characteristic of charcoal is power to remove substances from solution. A brown solution of raw sugar is decolouries when boiled with charcoal.
Sol. Sodium bicarbonate is also known as Baking Soda. The chemical formula of Sodium Bicarbonate is NaHCO3.
Sol. Dry Ice – We can simply say that Dry ice is solid Carbon dioxide CO2. It is used as a cooling agent.
Mustard gas – It is used as a strong chemical weapon. This mortally chemical affects skin, leering eye, lungs and D.N.A. which affects the cells most. A fullerene is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to seven atoms.
Sol. Chromatography is a separation technique used to separate the different components in a liquid mixture. The purpose of preparative chromatography is to separate the components of a mixture for more advanced use and thus a form of purification.
Sol. Nitrogen gas is usually filled in electric bulb in a small amount with Argon Gas.
Sol. Among the metals, gold is the least reactive, so it can be accessed in the native (free) state.
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