WBCHSE Class 11 Chemistry: Some Basic Concepts of Chemistry – Chhaya Publication Unit-1 (Some Basic Concepts of Chemisiry) of Chhaya Chemistry (xi) Part-1 Q1. The ratio of molecular masses of two substances \( A \) and \( B \) is \( 2: 3 \). If equal masses of these two substances be vaporised, the ratio … Read more
WBCHSE Class 11 Chemistry: Structure of Atom – Chhaya Publication MCQs from Structure of Atom Q1. The set of quantum numbers for the 23rd electron of chromium (atomic number \( =24 \) ) is- (A) \( 3,2,-2,+\frac{1}{2} \) (B) \( 3,1,+1,+\frac{1}{2} \) (C) \( 3,2,+3,+\frac{1}{2} \) (D) \( 3,3,1,+\frac{1}{2} \) Q2. In two different … Read more
Class 11: Classification of Elements and Periodicity in Properties MCQs from Unit – 3 Q1. Generally, IE increases from left to right in a period, but there are some exceptions. In which of the following cases do no such exceptions occur? (A) \( \text{N and O} \) (B) \( \text{Na and Mg} \) (C) \( … Read more