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

State what you observe when a piece of moist red litmus paper is placed in a gas jar of ammonia.

Give two reactions to show reducing property of ammonia.

Name two gases which give dense white fumes with ammonia.

Name a metallic chloride soluble in ammonium hydroxide.

When an ammonium salt is warmed with a sodium hydroxide solution, a gas is evolved. State three ways in which you can identify this gas.

Complete the following equation. What property of ammonia is illustrated by the reaction given below.
2NH₃ + 3CuO →

Among the elements of the second period, Li to Ne, pick out the element with the largest atomic size

Fill in the blanks.
Size of the atoms ______ from left to right across a period and ______ on descending in a group of normal elements.

Arrange the following in increasing order of property indicated
 I, I⁺, I^- (atomic size)

Select the correct answer
Atomic radii of fluorine and neon in angstrom unit are

What happens to the atomic size of elements on moving from left to right in a period?

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. Which one of these elements will form ions most readily and why?

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)