185623
Which of the following carbon contains only one element
1 Marble
2 Diamond
3 Glass
4 Sand
Explanation:
Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.
Some Basic Concepts of Chemistry
185624
In known elements, the maximum number is of
1 Metals
2 Non-metals
3 Metalloids
4 None of these
Explanation:
If we look at the mordern periodic table, there are about a total of \(118\) elements. Among these elements, metals are in the maximum number. There are \(95\) metals and seventeen non-metals. Rest are metalloids such as Silicon, Arsenic, Boron, etc.
Some Basic Concepts of Chemistry
185625
A mixture of \(ZnC{l_2}\) and \(PbC{l_2}\) can be separated by
1 Distillation
2 Crystallization
3 Sublimation
4 Adding aceitic acid
Explanation:
A mixture of \(ZnCl _2\) and \(PbCl _2\) is a non- homogeneous mixture. Hence, they can be separated using method of crystallization.
Some Basic Concepts of Chemistry
185626
A mixture of methyl alcohol and acetone can be separated by
1 Distillation
2 Fractional distillation
3 Steam distillation
4 Distillation under reduced pressure
Explanation:
Fractional distillation \(B.P.\) of methanol and acetone are \(338 \,K\) and \(330\, K\) which have boiling points very close to each other and hence they are separated by fractional distillation method.
Some Basic Concepts of Chemistry
185627
In the final answer of the expression \(\frac{{(29.2 - 20.2)\,(1.79 \times {{10}^5})}}{{1.37}}\). The number of significant figures is
1 \(1\)
2 \(2\)
3 \(3\)
4 \(4\)
Explanation:
(b) \(\frac{{(29.2 - 20.2)\;(1.79 \times {{10}^5})}}{{1.37}}\) \( = \frac{{9.0 \times 1.79 \times {{10}^5}}}{{1.37}}\) Least precise terms i.e., \(9.0\) has only two significant figures. Hence, final answer will have three significant figures.
185623
Which of the following carbon contains only one element
1 Marble
2 Diamond
3 Glass
4 Sand
Explanation:
Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.
Some Basic Concepts of Chemistry
185624
In known elements, the maximum number is of
1 Metals
2 Non-metals
3 Metalloids
4 None of these
Explanation:
If we look at the mordern periodic table, there are about a total of \(118\) elements. Among these elements, metals are in the maximum number. There are \(95\) metals and seventeen non-metals. Rest are metalloids such as Silicon, Arsenic, Boron, etc.
Some Basic Concepts of Chemistry
185625
A mixture of \(ZnC{l_2}\) and \(PbC{l_2}\) can be separated by
1 Distillation
2 Crystallization
3 Sublimation
4 Adding aceitic acid
Explanation:
A mixture of \(ZnCl _2\) and \(PbCl _2\) is a non- homogeneous mixture. Hence, they can be separated using method of crystallization.
Some Basic Concepts of Chemistry
185626
A mixture of methyl alcohol and acetone can be separated by
1 Distillation
2 Fractional distillation
3 Steam distillation
4 Distillation under reduced pressure
Explanation:
Fractional distillation \(B.P.\) of methanol and acetone are \(338 \,K\) and \(330\, K\) which have boiling points very close to each other and hence they are separated by fractional distillation method.
Some Basic Concepts of Chemistry
185627
In the final answer of the expression \(\frac{{(29.2 - 20.2)\,(1.79 \times {{10}^5})}}{{1.37}}\). The number of significant figures is
1 \(1\)
2 \(2\)
3 \(3\)
4 \(4\)
Explanation:
(b) \(\frac{{(29.2 - 20.2)\;(1.79 \times {{10}^5})}}{{1.37}}\) \( = \frac{{9.0 \times 1.79 \times {{10}^5}}}{{1.37}}\) Least precise terms i.e., \(9.0\) has only two significant figures. Hence, final answer will have three significant figures.
185623
Which of the following carbon contains only one element
1 Marble
2 Diamond
3 Glass
4 Sand
Explanation:
Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.
Some Basic Concepts of Chemistry
185624
In known elements, the maximum number is of
1 Metals
2 Non-metals
3 Metalloids
4 None of these
Explanation:
If we look at the mordern periodic table, there are about a total of \(118\) elements. Among these elements, metals are in the maximum number. There are \(95\) metals and seventeen non-metals. Rest are metalloids such as Silicon, Arsenic, Boron, etc.
Some Basic Concepts of Chemistry
185625
A mixture of \(ZnC{l_2}\) and \(PbC{l_2}\) can be separated by
1 Distillation
2 Crystallization
3 Sublimation
4 Adding aceitic acid
Explanation:
A mixture of \(ZnCl _2\) and \(PbCl _2\) is a non- homogeneous mixture. Hence, they can be separated using method of crystallization.
Some Basic Concepts of Chemistry
185626
A mixture of methyl alcohol and acetone can be separated by
1 Distillation
2 Fractional distillation
3 Steam distillation
4 Distillation under reduced pressure
Explanation:
Fractional distillation \(B.P.\) of methanol and acetone are \(338 \,K\) and \(330\, K\) which have boiling points very close to each other and hence they are separated by fractional distillation method.
Some Basic Concepts of Chemistry
185627
In the final answer of the expression \(\frac{{(29.2 - 20.2)\,(1.79 \times {{10}^5})}}{{1.37}}\). The number of significant figures is
1 \(1\)
2 \(2\)
3 \(3\)
4 \(4\)
Explanation:
(b) \(\frac{{(29.2 - 20.2)\;(1.79 \times {{10}^5})}}{{1.37}}\) \( = \frac{{9.0 \times 1.79 \times {{10}^5}}}{{1.37}}\) Least precise terms i.e., \(9.0\) has only two significant figures. Hence, final answer will have three significant figures.
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Some Basic Concepts of Chemistry
185623
Which of the following carbon contains only one element
1 Marble
2 Diamond
3 Glass
4 Sand
Explanation:
Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.
Some Basic Concepts of Chemistry
185624
In known elements, the maximum number is of
1 Metals
2 Non-metals
3 Metalloids
4 None of these
Explanation:
If we look at the mordern periodic table, there are about a total of \(118\) elements. Among these elements, metals are in the maximum number. There are \(95\) metals and seventeen non-metals. Rest are metalloids such as Silicon, Arsenic, Boron, etc.
Some Basic Concepts of Chemistry
185625
A mixture of \(ZnC{l_2}\) and \(PbC{l_2}\) can be separated by
1 Distillation
2 Crystallization
3 Sublimation
4 Adding aceitic acid
Explanation:
A mixture of \(ZnCl _2\) and \(PbCl _2\) is a non- homogeneous mixture. Hence, they can be separated using method of crystallization.
Some Basic Concepts of Chemistry
185626
A mixture of methyl alcohol and acetone can be separated by
1 Distillation
2 Fractional distillation
3 Steam distillation
4 Distillation under reduced pressure
Explanation:
Fractional distillation \(B.P.\) of methanol and acetone are \(338 \,K\) and \(330\, K\) which have boiling points very close to each other and hence they are separated by fractional distillation method.
Some Basic Concepts of Chemistry
185627
In the final answer of the expression \(\frac{{(29.2 - 20.2)\,(1.79 \times {{10}^5})}}{{1.37}}\). The number of significant figures is
1 \(1\)
2 \(2\)
3 \(3\)
4 \(4\)
Explanation:
(b) \(\frac{{(29.2 - 20.2)\;(1.79 \times {{10}^5})}}{{1.37}}\) \( = \frac{{9.0 \times 1.79 \times {{10}^5}}}{{1.37}}\) Least precise terms i.e., \(9.0\) has only two significant figures. Hence, final answer will have three significant figures.
185623
Which of the following carbon contains only one element
1 Marble
2 Diamond
3 Glass
4 Sand
Explanation:
Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.
Some Basic Concepts of Chemistry
185624
In known elements, the maximum number is of
1 Metals
2 Non-metals
3 Metalloids
4 None of these
Explanation:
If we look at the mordern periodic table, there are about a total of \(118\) elements. Among these elements, metals are in the maximum number. There are \(95\) metals and seventeen non-metals. Rest are metalloids such as Silicon, Arsenic, Boron, etc.
Some Basic Concepts of Chemistry
185625
A mixture of \(ZnC{l_2}\) and \(PbC{l_2}\) can be separated by
1 Distillation
2 Crystallization
3 Sublimation
4 Adding aceitic acid
Explanation:
A mixture of \(ZnCl _2\) and \(PbCl _2\) is a non- homogeneous mixture. Hence, they can be separated using method of crystallization.
Some Basic Concepts of Chemistry
185626
A mixture of methyl alcohol and acetone can be separated by
1 Distillation
2 Fractional distillation
3 Steam distillation
4 Distillation under reduced pressure
Explanation:
Fractional distillation \(B.P.\) of methanol and acetone are \(338 \,K\) and \(330\, K\) which have boiling points very close to each other and hence they are separated by fractional distillation method.
Some Basic Concepts of Chemistry
185627
In the final answer of the expression \(\frac{{(29.2 - 20.2)\,(1.79 \times {{10}^5})}}{{1.37}}\). The number of significant figures is
1 \(1\)
2 \(2\)
3 \(3\)
4 \(4\)
Explanation:
(b) \(\frac{{(29.2 - 20.2)\;(1.79 \times {{10}^5})}}{{1.37}}\) \( = \frac{{9.0 \times 1.79 \times {{10}^5}}}{{1.37}}\) Least precise terms i.e., \(9.0\) has only two significant figures. Hence, final answer will have three significant figures.