 a.Exothermic b.Endothermic c.Reduction d.Precipitation |
Q.Which of the following elements has
to shells , both of which are completely filled with electron.
(a)Hydrogen (b)Helim (c)Boron (D)Neon |
Q.Write the chemical equation for the
following reaction :
Aluminium sulphate +barium chloride = barium sulphate + aluminium chloride |
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Q.Why does distilled water not
conduct electricity , where as rain water does?
|
Q.Use mendeleev’s periodic table to
predict the formula for the oxides of the elements ; K,C, Al, Si .
|
Q.Explain the following context of
metal :
i. Ductility ii. Malleability iii. Conductor of heat and electricity |
Q.What do you mean by oxdising agent
? why is conversion of ethanol to ethanoic acid an oxidation reaction ? give
chemical reaction also .
(b)alcohol is a clean fuel comment ? (c)name the functional group present in butanone . |
Q.Oil and fat containing food items
are flushed with nitrogen.why?
(a) To prevent their reduction (b) To prevent their oxidation (c) To protect them from insects (d) To Protect them from rodents |
Q.What is common name of NaHCO3,?
(a) Zypsum (c) Baking soda (b) Bleaching powder (d) Washing soda |
Q.Which of the following elements has
twice as many electrons in its second shell as in its first shell?
(a) Oxygem (O) (c) Fluorine (F) (b) Nitrogen (N) (d) Carbon (C) |
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Q.While diluting an acid, why is it
recommended that the acid should be added to water and not water to the acid?
|
Identify the most appropriate option
in the following
(i) Element with maXimum valency: Na, Mg, Al
(i) Smallest atom : Li, Na, K (ii) Most electronetagive element N, O, F (iv) Least metallic element : Li, Be, B |
Q.Differentiate between Alloy and
Amalgam. (b) What is thermite reaction? Give chemical equation for it.
|
(a) Give two differences between
soaps and detergents.
(b) Define homologous series and functional group ? (c) What are saturated and unsaturated hydrocarbons? |
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2AgBr(s)__sunlight ___ = Ag (s)+Br2
(s) the above reaction is used in
(a) welding (b) Black & White photography (c) White washing walls (d) To prevent corrosion |
Q.What is neutralization reaction?
Give one example.
|
Identify the metals and metalloids in
the following elements:
Sodium (Na), Silicon (Si), Germanium (Ge), Lithium (Li) |
Q.Define the following : (a) Mineral
(b) Gangue
(i) Write the chemical equation for the following reactions: (a) Iron with Steam (b) Calcium with water |
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Q.(a) Write the formula of benzene
and draw its structure.
(b) Differentiate between hard water and soft water. (c) How and why ethanol is de naturated? |
Q.Which of the following exothermic
reaction?
(a) Decomposition of calcium carbonate by heat (b) Decomposition of silver chloride by sunlight (c) Decomposition of vegetable matter into compost (d) Decomposition of lead nitrate by heat |
Q.Which of the following element has
a total of two shells, with three electrons in its valence shell?
(a) Boron (B) (b) Carbon (C) (c) Nitrogen (N) (d) Oxygen (O) |
Q.How do Mendel's experiments show
that traits may be dominant or recessive ?
|
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