291.

Largest difference in radii is found in case of the pair

• Li, Na

• Na, K

• K, Rb

• Rb, Cs

During estimation of nickel, we prepare nickel dimethylglyoxime, a scarlet red solid. This compound is

• ionic

• covalent

• metallic

• non-ionic complex

Which of the following is most polarised ?

• Kr

• He

• Ar

• Xe

Which statement is true for ferrocene?

• All Fe-C are of equal length.

• C are sp² hybridized.

• It was the first discovered organometallic compound.

• All of these

Assertion : F is more electronegative than Cl.

Reason : F has high electron affinity than Cl.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Acetylene on reacting with sodamide gives sodium acetylidc and ammonia.

Reason : sp hybridised carbon atoms.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which has smallest size ?

• Na⁺

• Mg²⁺

• Ne

• O^2-

Assertion : The position of an element in periodic table after emission of one α and two β-particles remains unchanged.

Reason : Emission of one α and two β-particles give isotope of the element which acquires same position in periodic table.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Element having maximum affinity is :

• F₂

• Cl₂

• Br₂

• I₂

Element having maximum ionization energy :

• Na

• Li

• K

• Rb