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• The atomic number of sodium is 11 and its mass number is 23. It has
  The atomic number of sodium is 11 and its mass number is 23. It has
• An alpha particle contains
  An alpha particle contains
• The electrons present in the outermost shell are called
  The electrons present in the outermost shell are called
• The isotope deuterium of hydrogen has
  The isotope deuterium of hydrogen has
• The nucleons are
  The nucleons are
• Which of the following is a wrong combination?
  Which of the following is a wrong combination?
• Which among the following is **not** a postulate of Dalton's atomic theory?
  Which among the following is **not** a postulate of Dalton's atomic theory?
• The molecular mass of $x$ is 106. $x$ can be
  The molecular mass of $x$ is 106. $x$ can be
• Number of moles present in $28$ g of nitrogen **atoms** are
  Number of moles present in $28$ g of nitrogen **atoms** are
• Ethanol: $\mathrm{C_2H_5OH}$ (= $\mathrm{C_2H_6O}$). What is its molecular mass?
  Ethanol: $\mathrm{C_2H_5OH}$ (= $\mathrm{C_2H_6O}$). What is its molecular mass?
• The valency of nitrogen in $\mathrm{NH_3}$ is
  The valency of nitrogen in $\mathrm{NH_3}$ is
• All noble gas molecules are
  All noble gas molecules are
• The symbol of cadmium is
  The symbol of cadmium is
• The formula for quicklime is
  The formula for quicklime is
• The atomicity of $\mathrm{K_2Cr_2O_7}$ is
  The atomicity of $\mathrm{K_2Cr_2O_7}$ is
• If $a,b,c$ are the lengths of the three sides of a triangle, then which of the following is always true?
  If $a,b,c$ are the lengths of the three sides of a triangle, then which of the following is always true?
• With a ruler and compasses which of the following is **not** possible to construct?
  With a ruler and compasses which of the following is **not** possible to construct?
• With only a ruler and compasses, which of the following is **not** possible to construct?
  With only a ruler and compasses, which of the following is **not** possible to construct?
• If in $\triangle ABC$, $AB=6$ cm, $\angle A=70^\circ$ and $\angle B=40^\circ$, then find $\angle C$.
  If in $\triangle ABC$, $AB=6$ cm, $\angle A=70^\circ$ and $\angle B=40^\circ$, then find $\angle C$.
• Which of the following sets can be the interior angles of a triangle?
  Which of the following sets can be the interior angles of a triangle?