Assertion (A): Among halogens fluorine is the best oxidant.
Reason (R): Fluorine is the most electronegative atom.
Codes:
(a) both assertion and reason are true and the reason is the correct explanation of assertion
(b) both assertion and reason are true but reason is not the correct explanation of assertion
(c) assertion is true but reason is false
(d) both assertion and reason are false

(a)

Both A and R are true and R explains A

(b)

Both A and R are true but R does not explain A

(c)

A is true but R is false

(d)

Both A and R are false

In redox reaction which of the following Is true?

(a)

Number of electrons lost is more than number of electrons gained

(b)

Number of electrons lost is less than number of electrons gained

(c)

Number of electrons lost is equal number of electrons gained

(d)

No transfer and gain of electrons during the reaction.

Which of the following conclusions could not be derived from Rutherford's \(\alpha\)-particle scattering experiment? 

(a)

Most of the space in the atom is empty.

(b)

The radius of the atom is about 10^-10 m while that of the nucleus is 10^-15 m

(c)

 Electrons move in a circular path of fixed energy called orbits.

(d)

Nucleus and the electrons are held together by electrostatic force of attraction

Considering Bohr's model which of the following statements is correct?

(a)

The energies of electrons are continuously reduced in the form of radiation.

(b)

The electron is revolving around the nucleus in a dynamic orbital.

(c)

Electrons can revolve only in those orbits in which the angular momentum (mvr) of the electron must be equal to an integral multiple of h/2\(\pi\) .

(d)

In an atom, electrons are embedded like seeds in watermelon.

The general electronic configuration of p-block element is _____

(a)

ns^1-2

(b)

np^1-6

(c)

np⁶

(d)

ns² np⁶

Consider the following statements.
(i) Position of hydrogen could not be made clear.
(ii) Isotopes find correct place in Mendeleev's periodic table.
(iii) Mendeleev's periodic table could not explain the variable valencies of elements.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(i) and (iii)

(c)

(ii) only

(d)

(i), (ii), (iii)

Consider the following statements.
(i) The valency of the elements increases from left to right in a period.
(ii) Valency decreases from 7 to 1 with respect to oxygen.
(iii) The metallic character of the elements decreases across a period.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(i) and (iii)

(d)

(i) (ii) and (iii)

Statement I: Greater is the critical temperature, more difficult is to liquefy the gas.
Statement II: Stronger the intermolecular forces, lower would be the critical temperature of that gas.

(a)

Both statement I and statement II are true and statement II explains statement I.

(b)

Both statement I and statement II are true but statement II does not explain statement I.

(c)

Statement I is true but statement II is false.

(d)

Both the statements are false

In an exothermic reaction, heat is evolved and system loses heat to the surroundings. For such system
(i) q_p will be negative
(ii) Δ_rH will be positive
(iii) q_p  will be positive
(iv) Δ_rH will be negative

(a)

(i), (ii)

(b)

(iii), (iv)

(c)

(i) & (iv)

(d)

(ii) & (iii)

Which of the following is the lewis structure of water?

(a)

\(H-\overset { .. }{ \underset { .. }{ O } } -H\)

(b)

(c)

(d)