Advertisements
Advertisements
Question
Select the correct answer to the statement given below:
A metalloid
Options
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
Advertisements
Solution
Silicon
APPEARS IN
RELATED QUESTIONS
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Name: a Metal Which is brittle
Name: the Hardest Naturally Occurring Substance
Give one use of the following substance:
Brass
Give one use of the following substance:
Coal
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
Select the correct answer from the choice given below.
The negatively charged particles in an atom
Write the names of elements from the following symbol:
Xe
Write the names of elements from the following symbol:
Ir
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
State five different characteristics of compounds.
Give three differences between elements & compounds with relevant examples.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Select the correct answer from A, B, C, D & E for the statement given below :
A mixture consisting of elements & a compound.
Select the correct answer from the choice given below to complete the sentence :
Compounds are ____________ in nature.
Differentiate between elements and compounds.
Complete the table:
| Element | Latin Name | Symbol |
| Mercury | ______ | Hg |
| Lead | Plumbum | ______ |
| Iron | ______ | Fe |
| Potassium | Kalium | ______ |
