(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Atomic size increases from left to right across a period.

The following questions refer to the Periodic Table.
What happens to the atomic size of elements moving from top to bottom of a group?

Supply the missing word from those in the brackets:
If an element has seven electrons in its outermost shell then it is likely to have the ______ (largest/ smallest) atomic size among all the elements in the same period.

The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba.

1. Which one of these elements will form ions most readily and why?
2. State the common feature in their electronic configuration.

Arrange the following as per the instruction given in the bracket:

Mg, Cl, Na, S, Si, (decreasing order of atomic size).

Fill in the blank by selecting the correct word from the bracket.
If an element has seven electrons in its outermost shell then it is likely to have the _____ atomic size among all the elements in the same period.

Arrange the following as per the instruction given in the bracket
Na, K, Li (Increasing atomic size)

Give the formula of liquid ammonia.

What is liquor ammonia fortis?

Mention two possible ways by which ammonia produced is removed from unchanged gases.

How will you demonstrate the solubility of ammonia in water? Explain.

List the properties of ammonia that make it a good refrigerant.

Describe two tests to identify ammonia and ammonium ions in an aqueous solution.

Choose the correct word or phrase from the bracket to complete the following sentence: 
 Heating ammonium chloride with sodium hydroxide produces ______.