Chemistry-
General
Easy
Question
The salts of _____ do not cause hardness of water :
- sodium
- magnesium
- potassium
- both (A) and (C)
The correct answer is: both (A) and (C)
Related Questions to study
Chemistry-
Light a candle and observe its flame, you will find that it is spindle-shaped and has different colours in different regions. The flame has three main zones depending on the amount of air it receives.
Which zone is least hot zone
Light a candle and observe its flame, you will find that it is spindle-shaped and has different colours in different regions. The flame has three main zones depending on the amount of air it receives.
Which zone is least hot zone
Chemistry-General
Chemistry-
What does this experiment show?
What does this experiment show?
Chemistry-General
Chemistry-
Students were carrying out an experiment in the laboratory, in which one of the steps involved heating the alcohol. However, the teacher strictly instructed the students not to heat alcohol directly on flame. Why do you think the teacher gave such an instruction?
Students were carrying out an experiment in the laboratory, in which one of the steps involved heating the alcohol. However, the teacher strictly instructed the students not to heat alcohol directly on flame. Why do you think the teacher gave such an instruction?
Chemistry-General
Chemistry-
When you introduce a glass plate into the luminous zone of a candle flame for a few seconds, the observation is as shown in figure
When you introduce a glass plate into the luminous zone of a candle flame for a few seconds, the observation is as shown in figure
Chemistry-General
Chemistry-
Which of the following is an ideal fuel?
Which of the following is an ideal fuel?
Chemistry-General
Chemistry-
Inflammable substances have an ignition temperature :
Inflammable substances have an ignition temperature :
Chemistry-General
Chemistry-
Carbon exist in two allotropic forms (i) crystalline and (ii) Amorphous. These allotropes of carbon having well defined crystal structures are : diamond, graphite and fullerenes. In diamond each carbon is tetrahedrally linked to four neighbouring carbon atoms through four strong bonds. This network extends in three dimension and is very rigid. In graphite each carbon is linked to three other carbon atoms forming hexagonal rings and form sheet like (layered) structure. The various sheets or layers are held together by weak Vander wall force of attraction.
In graphite, electrons are
Carbon exist in two allotropic forms (i) crystalline and (ii) Amorphous. These allotropes of carbon having well defined crystal structures are : diamond, graphite and fullerenes. In diamond each carbon is tetrahedrally linked to four neighbouring carbon atoms through four strong bonds. This network extends in three dimension and is very rigid. In graphite each carbon is linked to three other carbon atoms forming hexagonal rings and form sheet like (layered) structure. The various sheets or layers are held together by weak Vander wall force of attraction.
In graphite, electrons are
Chemistry-General
Chemistry-
The nature of chemical bond in diamond is:
The nature of chemical bond in diamond is:
Chemistry-General
Chemistry-
4HNO3 + C 
CO2 + 2H2O + NO2
Which of the following statements is true for the above reaction?
4HNO3 + C CO2 + 2H2O + NO2
Which of the following statements is true for the above reaction?
Chemistry-General
Chemistry-
Graphite is also known as
Graphite is also known as
Chemistry-General
Chemistry-
Coal is an impure form of carbon in which percentage of carbon varies from _____ to _____
Coal is an impure form of carbon in which percentage of carbon varies from _____ to _____
Chemistry-General
Chemistry-
The mass of the electron is:
The mass of the electron is:
Chemistry-General
Chemistry-
What is the ratio of mass of an electron to the mass of a proton?
What is the ratio of mass of an electron to the mass of a proton?
Chemistry-General
Chemistry-
In Rutherford’s atomic model, the electrostatic force of attraction between the positively and negatively charged particles is counter balanced by
In Rutherford’s atomic model, the electrostatic force of attraction between the positively and negatively charged particles is counter balanced by
Chemistry-General
Physics-
Two coils have a mutual inductance 0.005 H The current changes in the first coil According to equation I =I0 sin 
where I0 = 10A and 
= 100 
radian / second The maximum value of e.m. fin the second coil is
Two coils have a mutual inductance 0.005 H The current changes in the first coil According to equation I =I0 sin where I0 = 10A and = 100 radian / second The maximum value of e.m. fin the second coil is
Physics-General
