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WorksheetsFIRST TERM -CHEMISTRY
Total questions: 20
Worksheet time: 18mins
Which is wrong?
4d
5p
3f
4p
Which is the correct electronic configuration?
1s2 2s2 2p6 3s2 3p6 3d4 4s2
1s2 2s2 2p6 3s2 3p6 3d9 4s2
1s2 2s2 2p6 3s2 3p6 3d10 4s1
1s2 2s2 2p6 3s2 3p6 3d2
The subshell electronic configuration of an element is
1s2 2s2 2p6 3s2 3p6 3d7 4s2 . What is its group number?
2
7
9
14
An element in Period 4 has 6 electrons in its d subshell. The atomic number of the element is
16
10
6
26
Which of the following elements shows variable oxidation states?
1s2 2s2 2p6 3s2 3p5
1s2 2s2 2p6 3s2 3p6 3d5 4s1
1s2 2s2 2p6 3s2 3p6 4s2
1s2 2s2 2p6
The number of moles of molecules in 90grams of water(H2O) is
(Molecular mass of H2O = 18)
6.022 x 1023
90
5
18
The volume of one mole of any gas at STP is
2 . 24L
224L
22.4 L
12.4L
How many molecules are present in 112L of CO2?
(Molecular mass of CO2 = 44)
22.4
6.022 x 1023
5 x 6.022 x 1023
44 x 6.022 x 1023
Which of the following is the mathematical form of Charles' law?
PV = a constant
P/V = a constant
VT = a constant
V/T = a constant
An air bubble has a volume of 8mL at the bottom of a pool with a pressure of 4 atm. If it rises up, what will be its volume when the pressure is 2atm at the surface?
4mL
8mL
16mL
32mL
What is the mass of 44.8 Litres of ammonia gas at STP?
(Molecular mass of ammonia(NH3) = 17
17g
34g
85g
51g
An inflated balloon when immersed in water, its size decreases. It is in accordance with
Charle's law
Le Chatelier's principle
Boyle's law
Avagadro's law
Which of the following statements is not applicable to gases?
The energy of molecules is very high
The movement of molecules is very high
The attractive force between molecules is very high
The collision of molecules is perfectly elastic in nature and so there is no loss of energy
The equation for reduction reaction in Cu - Ag cell is
Cu --> Cu2+ + 2e-
Cu2+ + 2e- --> Cu
Ag --> Ag+ + 1e-
Ag+ + 1e- --> Ag
In an X - Y galvanic cell, oxidation takes place at X electrode. What will be the equation for the reaction at the cathode
X --> X2+ + 2e-
Y --> Y2+ + 2e-
X2+ + 2e- --> X
Y2+ + 2e- --> Y
An aqueous solution of sodium chloride(NaCl) is electrolysed. The product formed at the cathode will be
Oxygen
Chlorine
Hydrogen
Sodium
The product formed by the electrolysis of sodium chloride solution turns phenolphthalein pink. Which is that product?
Sodium
Chlorine
Sodium hydroxide
Hydrogen
In the electroplating of gold on copper cup, the electrolyte used is
Copper sulphate solution
Sodium cyanide + Silver cyanide solutions
Sodium cyanide + Gold cyanide solutions
Silver nitrate solution
Whe an iron nail is kept in copper sulphate solution for some time, the blue colour of the solution disappears due to the reaction
Cu + 2e- --> Cu2+
Fe --> Fe2+
Fe2+ + 2e- --> Fe
Cu2+ + 2e- --> Cu
The energy change in the above cell is
Electrical energy is converted into chemical energy
Chemical energy is converted into electrical energy
Electrical energy is converted into mechanical energy
Chemical energy is converted into heat energy
