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Worksheetssci pro
Total questions: 20
Worksheet time: 10mins
Sodium carbonate is a basic salt because it is a salt of
strong acid and strong base
weak acid and weak base
strong acid and weak base
weak acid and strong base
Which of the following statements is correct about an aqueous solution of an acid and of a base ?
(i) higher the pH, stronger the acid
(ii) higher the pH, weaker the acid
(iii) lower the pH, stronger the base
(iv) lower the pH, weaker the base
(i) and (iii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Which of the following salts does not contain water of crystallisation ?
blue vitriol
baking soda
washing soda
gypsum
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. the role of calcium chloride in the guard tube is to
absorb the evolved gas
moisten the gas
absorb moisture from the gas
absorb Cl- ions from the evolved gas
What happens when a solution of an acid is mixed with a solution of a base in a test tube ?
(i) the temperature pf the solution increases.
(ii) the temperature of the solution decreases.
(iii) the temperature of the solution remains the same
(iv) salt formation takes place.
(i) only
(i) and (iii)
(ii) and (iii)
(i) and (iv)
Which of following is (are) true when HCl is passed through water ?
(i) it does not session in the solution as it a covalent compound.
(ii) it ionise in the solution.
(iii) it gives both hydrogen and hydroxyl ion in the solution.
(iv) it forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.
(i) only
(iii) only
(ii) and (iv)
(iii) and (iv)
Which of the following is used for dissolution of gold ?
hydrochloric acid
sulphuric acid
nitric acid
aqua regia
Which of the following substance will not give carbon dioxide on treatment with dilute acid ?
wash the hand with saline solution.
wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate.
after washing with plenty of water apply solution of sodium hydroxide on the hand.
neutralise the acid with a strong alkali.
The pH of the gastric juices released during digestion is
less than 7
more than 7
equal to 7
equal to 0
Which of the following methods is suitable for preventing an iron frying pan from rusting ?
applying grease
applying point
applying a coating of zinc
all of the above.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. the element is likely to be
calcium
carbon
silicon
iron.
Food cans are coating with and not with zinc because
zinc is costlier than tin.
zinc gas a higher melting point than tin.
zinc is more reactive than tin.
zinc is less reaction than tin.
What happens when calcium is treated with water ?
(i) it does not react with water.
(ii) it reacts violently with water
(iii) it reacts less violently with water.
(iv) bubbles of hydrogen gas formed stick to the surface of calcium.
(i) and (iv)
(ii) and (iii)
(i) and (ii)
(iii) and (iv)
The ability of the metals to be drawn into thin wires is known as
ductility
malleability
sonorousity
conductivity
Which of the following metals exist in their native state in nature ?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
(i) and (ii)
(ii) and (iii)
(ii) and (iv)
(iii) and (iv)
Galvanisation is a method of protecting iron from rusting by coating with a thin layer of
gallium
aluminium
zinc
silver
Stainless steel is very useful material for our life. in stainless steel, iron is mixed with
Ni and Cr
Cu and Cr
Ni and Cu
Cu and Au
Generally, non-metals are not lustrous. which of the following non-metal is lustrous ?
sulphur
oxygen
nitrogen
iodine
The electronic configurations of three element X, Y and Z are X - 2, 8;Y -2, 8, 7 and Z - 2, 8, 2. which of the following is correct ?
X is a metal.
Y is a metal.
Z is a non-metal.
Y is a non-metal and Z is a metal.
Which of the following are not ionic compounds ?
(i) KCI
(ii) HCI
(iii) CCI4
(iv) NaCI
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iii)
