Q.1
The main chemical constituent of clay is
Q.2
The metal does not give H2 on treatment with dilute HCL is
Q.3
The number of electrons presents in H+ is
Q.4
Which one amongst the following is not a Green House gas?
Q.5
The gas used for artificial ripening of green fruit is
Q.6
Zone refining is used for the purification of
Q.7
The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
Q.8
The mineral containing both magnesium and calcium is
Q.9
The number of g-molecule of oxygen in 6.02 x 1024 CO molecules is
Q.10
The most extensive, commercially useful source of thorium as monazite sand occurs in India at
Q.11
The hottest part of the gas flame is known as
Q.12
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
Q.13
The 'solid waste' is also known as
Q.14
The molecule which has the highest percentage of ionic character among the following is
Q.15
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
Q.16
The main active constituent of tea and coffee is
Q.17
The high reactivity of fluorine is due to
Q.18
The maximum number of isomers for an alkene with molecular formula C4H8 is
Q.19
Galvanization is the :
Q.20
A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
Q.21
Rusting of iron takes place due to
Q.22
When a spoon is to be electroplated with nickel the spoon is
Q.23
A non-electronic conductor is
Q.24
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :
Q.25
The metal used to galvanise iron to protect it from rusting is
Q.26
Combustion of a candle is a/an
Q.27
Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ?
Q.28
Conversion of chemical energy into electrical energy occurs in
Q.29
The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
Q.30
Which type of fire extinguisher is used for petroleum fire ?
Q.31
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is
Q.32
The anode of a dry cell is made up of
Q.33
The metals commonly used for electroplating are
Q.34
Which of the following is very reactive and kept in kerosene?
Q.35
Which metal does not undergo corrosion due to the formation of oxide layer?
Q.36
Iron is prevented from rusting by coating with zinc. This process is called as
Q.37
An electric iron has a heating element made of :
Q.38
Candle is a mixture of
Q.39
Coal is formed from
Q.40
Galvanization of iron is carried out using
Q.41
The working of a dry cell is based on
Q.42
Man dies in the atmosphere of CO, because it
Q.43
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of
Q.44
Water gas is the combination of
Q.45
The gas that causes suffocation and death when coal or coke is burnt in a closed room is
Q.46
The coating of a thin layer of zinc on steel or iron objects is known as
Q.47
In galvanization, iron is coated with
Q.48
The lustre of the metals is because of
Q.49
The first metal used by a man was
Q.50
The Latin word formica means ant. The name formic acid is derived from this Latin word because
0 h : 0 m : 1 s