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What volume of oxygen will remain after reacting 8cm\(^3\) of hydrogen gas with 20cm\(^3\) of oxygen gas?
The number of electrons in the valence shell of an element of atomic number 14 is?
Suitable reagents for the laboratory preparation of nitrogen are
A quantity of electricity liberates 3.6g of Silver from its salt. What mass of aluminium Will be liberated from its salt by the same quantity of electricity? [Al = 27, Ag = 108].
Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of Sand, water and methanoic acid?
In the preparation of oxygen by heating KCIO\(_3\) , in the presence of MnO\(_2\) only moderate heat is needed because the catalyst acts by \(_2\)
Which of the following pairs of substances will react further with oxygen to form a higher oxide?
The boiling of fat and aqueous caustic soda is referred to as
In the shown experiment (Fig. 1) the litmus paper will initially
If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric acid concentration will be
The periodic classification is an arrangement of the elements
Which of the following statements is correct about the periodic table?
On which of the following is the solubility of a gaseous substance dependent?
I. Nature of solvent
II. Nature of solute
III. Temperature
IV. Pressure
A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that
A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
The Consecutive members of an alkane homologous series differ by
Which of the following gases may not be dried with concentrated sulphuric acid?
An element used in the production of matches is
According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to
To what temperature must a gas at 273k be heated in order to double both its volume and pressure?