Question 2 :
State True or False.<br/>J.J. Thomson's atomic model could not justify the shielding of electrons from positive charges.
Question 5 :
Assertion: The characteristics of cathode rays do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.
Reason: Cathode rays consist of negatively charged particles, called electrons.
Question 6 :
If the mass of electron is doubled, the speed of electron revolving around $Li^{2+}$ nucleus will ________
Question 7 :
A beam of some kind of particle of velocity $2\times {10}^{7}m/s$ is scattered by a gold $(z=79)$ foil. Find specific charge of this particle (charge/mass) if the distance of closest approach is $7.9\times {10}^{-14}m$.
Question 8 :
The mass and charge of one mole of electrons, respectively is:
Question 9 :
Which is not anomalous pair of elements in the Mendeleev's periodic table?
Question 11 :
Classification of periodic table based on atomic number is given by:<br/>
Question 12 :
Which of the following is not a merit of Mendeleev's periodic table?
Question 16 :
According to Lothar Meyer's curve, which of the following statement is/are correct?
Question 17 :
The number of electron involved in the bond formation of $N_2$ molecule?
Question 19 :
The electronegativity of Caesium is $0.7$ and that of Fluorine is $4.0$. The bond formed between the two is _________________.
Question 20 :
The electronic configuration of element $X$ is $2,8,8,1$ and the electronic configuration of element $Y$ is $2,8,7$. Then the type of bond formed between these two elements is
Question 21 :
Which set of compounds in the following pair of ionic compounds has the higher lattice energy?<br/>(I) $KCl$ or $MgO$<br/>(II) $LiF$ or $LiBr$<br/>(III) $MgF_2$ or $NaCl$<br/>
Question 26 :
In which of the following chemical equation, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
Question 27 :
When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution due to:
Question 28 :
On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur?
Question 29 :
If we allow ammonia solutions of s-block metals to stand for a long time, blue colour fades away. This is due to the:
Question 30 :
In presence of iron, alkali metal react with liquid ammonia and form:
Question 31 :
Assertion: Alkali metals dissolves in liquid ammonia to give blue solution
Reason: Alkali metals in liquid ammonia give solvated species of the type $[\mathrm{M}(\mathrm{N}\mathrm{H}_{3})_{\mathrm{n}}]^{+}$( $\mathrm{M}=$ alkali metals).
Question 32 :
Which of the following will have the largest size in water?<br>
Question 33 :
Assertion: $FrCl$ has $CsCl$ structure with coordination number 8.
Reason: $CN$ 8 is favoured by the large cation size.<br/>Read the above assertion and reason and choose the correct option regarding it.
Question 34 :
Oxide, peroxide and superoxide - all the three can be formed by:<br/>