Question
ABC is a triangle in vertical plane. Its two base angles ÐBAC and ÐBCA are 45º and tan–1 (1/3) respectively. A particle is projected from point A such that it passes through vertices B and C. Find angle of projection in degrees:
- 60º
- 53º
- tan–1(5/4)
- tan–1(5/3)
The correct answer is: 53º
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The space between nucleus and electrons in an atom is
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Rutherford’s experiment on scattering of alpha particles showed for the first time that atom has:
Rutherford’s experiment on scattering of alpha particles showed for the first time that atom has:
The cations and anions formed as a result of electron transfer are drawn towards each other due to the electrostatic force (coulomb force) of attraction. They form an ionic bond or an electrovalent bond. The bond between two elements is ionic if the EN difference between them is greater than 1.7. The number of electrons transferred during an ionic bond formation is known as an electrovalency. Compounds containing ionic bonds are called ionic compounds. Examples of ionic compounds are NaCl(Na+Cl–), CaO(Ca2+O2–), MgO(Mg2+O2–) and MgCl2 .
Element X is strongly electropositive and the element Y is strongly electronegative. Both are univalent. The compound formed would be:
The cations and anions formed as a result of electron transfer are drawn towards each other due to the electrostatic force (coulomb force) of attraction. They form an ionic bond or an electrovalent bond. The bond between two elements is ionic if the EN difference between them is greater than 1.7. The number of electrons transferred during an ionic bond formation is known as an electrovalency. Compounds containing ionic bonds are called ionic compounds. Examples of ionic compounds are NaCl(Na+Cl–), CaO(Ca2+O2–), MgO(Mg2+O2–) and MgCl2 .
Element X is strongly electropositive and the element Y is strongly electronegative. Both are univalent. The compound formed would be:
An aqueous solution of a salt Compound A is :
A)gives a white precipitate
B)with sodium chloride solution The filtrate gives a black precipitate
C)when H2S is passed into it Compound (B) dissolves in hot water and the solution gives a yellow precipitate
D)on treatment with sodium iodide The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating Identify the compounds (A) to (D)
An aqueous solution of a salt Compound A is :
A)gives a white precipitate
B)with sodium chloride solution The filtrate gives a black precipitate
C)when H2S is passed into it Compound (B) dissolves in hot water and the solution gives a yellow precipitate
D)on treatment with sodium iodide The compound (A) does not give any gas with dilute HCl but liberates a reddish brown gas on heating Identify the compounds (A) to (D)