MEDIUM
10th CBSE
IMPORTANT
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Which one of the following correctly represents Sodium oxide?

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Important Questions on Metals and Non-metals

EASY
10th CBSE
IMPORTANT
Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-metals>Sample Paper>Q 53
An element with atomic number _____ will form a basic oxide.
EASY
10th CBSE
IMPORTANT
Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-metals>Sample Paper>Q 54
An element M has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of M is:
HARD
10th CBSE
IMPORTANT
Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-metals>Sample Paper>Q 56
An element ‘M’ with electronic configuration 2,8,3 combines separately with Cl-,SO4-2 anions. Write the chemical formulae of the compounds formed. Predict with the suitable reason the nature of the bond formed by element ‘M’ in general. How will the electrical conductivity of the compounds formed vary with respect to ‘M’?
HARD
10th CBSE
IMPORTANT
Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-metals>Sample Paper>Q 57

A reddish-brown metal ‘X’, when heated in air, gives a black compound ‘Y’, which when heated in the presence of H2 gas gives ‘X’ back. ‘X’ is refined by the process of electrolysis; this refined form of ‘X’ is used in electrical wiring. Identify ‘X’ and ‘Y’. Draw a well-labelled diagram to represent the process of refining ‘X’.