Question 2 :
Assertion: There cannot be chemical equilibrium in an open system.
Reason: There is no fixed mass in an open system.
Question 3 :
A child bought a balloon which became very small in size the next day. Which is correct statement about balloon?
Question 4 :
Solids whose constituents are arranged in a regular pattern are known as ______________.
Question 5 :
Assertion: Statement-1 : In water, orthoboric acid behaves as a weak monobasic Lewis acid.
Reason: Statement-2 : In water, orthoboric acid acts as a proton donor.
Question 6 :
London dispersion force is the only intermolecular force that works on what?
Question 7 :
A chemical reaction, $A\rightleftharpoons B$, is said to be in equilibrium when:
Question 9 :
The equilibrium constant $(K_p)$ for the reaction $PCl_5(g)\rightleftharpoons PCl_3(g) $ is 16. If the volume of the container is reduced to one-half its original volume, the value of $K_p$ for the reaction at the same temperature will be:
Question 11 :
Among the alkali metals, the metal with the<br/>highest ionisation potential is:<br/>
Question 12 :
Assertion: Potassium and caesium are used in photoelectric cells.
Reason: Potassium and caesium emit electrons on exposure to light.
Question 15 :
Which of the following metals does not show inert pair effect?
Question 16 :
When ${ SO }_{ 2 }$ is passed through acidified ${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }$ solution:
Question 21 :
2-Methyl butane on reacting with bromine in the presence of sunlight gives mainly:
Question 22 :
Which of the following statement regarding free radical halogenation of alkane is not true?<br>
Question 24 :
Assertion: Propene reacts with $HBr$ in the presence of benzoyl peroxide to yield 2-bromopropane.
Reason: In presence of peroxide, the addition of $HBr$ to propene follows ionic mechanism.
Question 25 :
For the preparation of alkanes, aqueous solution of sodium or potassium salt of carboxylic acid is subjected to:<br/>
