Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Nitin Tiwari 5 years, 10 months ago
- 0 answers
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
Ammonium chloride - NH4Cl; It is obtained from ammonia and hydrochloric acid. The aqueous solution of ammonium chloride salt turns blue litmus red. Hence, it is acidic in nature.
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
Sodium hydroxide is produced by the electrolysis of an aqueous solution of sodium chloride (called brine).
The process is called the chlor-alkali process because of the products formed, i.e. ‘chlor’ for chlorine and ‘alkali’ for sodium hydroxide.
2NaCl(aq) + 2H2O(aq) → 2NaOH(aq) + H2(g) + Cl2(g)
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Sahil Sorkhi 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Rajveer Singh 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
(a) DNA is located in chromosomes in the form of genes in the cell.
(b) When the DNA already present in the nucleus of a parent cell is copied by making more of DNA by certain biochemical reactions, then slight variations come in the two copies formed. Thus, variations are produced in the offspring's during reproduction which form the basis of evolution.
Example: Offspring's produced by asexual reproduction have slight variations from their parents.
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
(a) Genes are the functional units of chromosomes.
(b) Genes are located on chromosomes.
(c) Genes transmit the heredity information from parents to offsprings.
Posted by Gulshan Kumar 5 years, 10 months ago
- 0 answers
Posted by Vidya Verma 5 years, 10 months ago
- 3 answers
Posted by Parav Singh 5 years, 10 months ago
- 3 answers
Posted by Varun Gupta 5 years, 10 months ago
- 1 answers
Broken Soul 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Broken Soul 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 3 answers
Priya Rajoriya Rajoriya 5 years, 10 months ago
Sahil Sorkhi 5 years, 10 months ago
Broken Soul 5 years, 10 months ago
Posted by Deepa Sasi 5 years, 10 months ago
- 3 answers
Parul Saini 5 years, 10 months ago
Posted by Dhruvil Bharucha 5 years, 10 months ago
- 1 answers
Punam Singh 5 years, 10 months ago
Posted by Piyush Kumar 5 years, 10 months ago
- 4 answers
Parul Saini 5 years, 10 months ago
Posted by Rani Mishra ??? 5 years, 10 months ago
- 2 answers
Neha Kothari 5 years, 10 months ago
Posted by Seema Rattan 5 years, 10 months ago
- 1 answers
Posted by Aadya Singh 5 years, 10 months ago
- 8 answers
Nilesh Vishwakarma 5 years, 10 months ago
Aadya Singh 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Abhinav Singh 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
Fertilisation is possible if mating takes place during the middle of menstrual cycle because in a normal healthy girl the ovulation takes place on the 14th day of the beginning of menstrual cycle of 28 days. The embedding of embryo in the thick lining of the uterus is called implantation. The lining thickens and is richly supplied with blood to nourish the growing embryo. If however, the egg is not fertilised, then the thick lining of the uterus is not required and the uterus lining breaks down and comes out through the ****** in the form of blood and mucous. This is called menstruation.
Posted by Abhilash Anandhan 5 years, 10 months ago
- 1 answers
✍️✍️✍️ ? 5 years, 10 months ago
Posted by Saiprasad Teli 5 years, 10 months ago
- 4 answers
Nilesh Vishwakarma 5 years, 10 months ago
Aadya Singh 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 2 answers
Neha Kothari 5 years, 10 months ago
Shubham Ojha 5 years, 10 months ago
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
The prism has split the incident white light into a band of colours. The splitting of light into its component colours is called dispersion. The white light is dispersed into its seven-colour components by a prism. Different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. The red light bends the least while the violet the most.
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
Extraction of Less Reactive Metals:
The less reactive metals are extracted by the reduction of their oxides by heat alone.
Example: Mercury (II) sulphide ore is roasted in air when mercury (II) oxide is formed. When this mercury (II) oxide is heated to about 300° C, it decomposes to form mercury metal.
Extraction of Moderately Reactive Metals:
The moderately reactive metals in the middle of the reactivity series are extracted by the reduction of their oxides with carbon, aluminium, sodium or calcium.
It is easier to obtain metals from their oxides (by reduction) than from carbonates or sulphides. So, before reduction can be done, the ore is converted into a metal oxide. The concentrated ores can be converted into metal oxides by the process of calcination or roasting.
Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert it into a metal oxide.
For example: When zinc carbonate is heated strongly in the absence of air, it decomposes to form zinc oxide and carbon dioxide. Roasting is the process in which a sulphide ore is strongly heated in the presence of air to convert it into a metal oxide.
Extracting Metals towards the Top of the Activity Series:
Metals high up in the reactivity series are very reactive. These metals have a strong affinity for oxygen. So, oxides of sodium, magnesium, calcium and aluminium cannot be reduced by carbon.
These metals are obtained by electrolytic reduction.
Sodium, magnesium and calcium are obtained by the electrolysis of their molten chlorides.
Example: Sodium metal is extracted by the electrolytic reduction of molten sodium chloride. When electric current is passed through molten sodium chloride, it decomposes to form sodium metal and chlorine gas.
Posted by Naina ?..... 5 years, 10 months ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
Dispersion of light is the phenomenon of splitting of a beam of white light into its seven constituent colours on passing through a glass prism. The band of coloured components of a light beam is called its spectrum. The cause of dispersion is that different colours of white light with different wavelengths undergo different deviations on passing through a glass prism.
Posted by Nitin Tiwari 5 years, 10 months ago
- 1 answers
Parul Saini 5 years, 10 months ago
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
