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Class 10 · Science · Medium
→On heating baking soda, the gas formed turns lime water milky. What nature of solution does the remaining solid form?
Class 10 · Science · Medium
→Why is it necessary to keep the products separate in the chlor-alkali process?
Class 10 · Science · Medium
→In the chlor-alkali process, what is the correct pair of gas at cathode and gas at anode?
Class 10 · Science · Medium
→Aqueous sugar solution does not conduct electricity while salt solution does. What is the main reason?
Class 10 · Science · Medium
→Sodium chloride solution has pH near 7 but still conducts electricity. What does this prove?
Class 10 · Science · Medium
→Blue copper sulphate becomes white on heating and blue again on adding water. What does this prove?
Class 10 · Science · Medium
→Why is it necessary to heat gypsum only at controlled temperature?
Class 10 · Science · Hard
→Why does bleaching powder lose effectiveness when kept in a moist open place?
Class 10 · Science · Hard
→Why can sodium hydroxide become impure when kept in open air?
Class 10 · Science · Hard
→Ammonia gas turns moist red litmus blue but has no effect on dry red litmus. What does this prove?
Class 10 · Science · Hard
→An acidic gas has no effect on dry blue litmus but turns moist blue litmus red. What is the correct reason?
Class 10 · Science · Medium
→While diluting acid, why is it correct to add acid slowly to water instead of water to acid?
Class 10 · Science · Medium
→Magnesium and calcium carbonate are added separately to an acidic solution. What is the correct order of gases formed?
Class 10 · Science · Hard
→Carbon dioxide first makes lime water milky and then removes the milkiness in excess. What is the second soluble substance?
Class 10 · Science · Medium
→A white solid gives a gas with acid that turns lime water milky. The solid may belong to which group?
Class 10 · Science · Medium
→A salt solution turns red litmus blue. It is more likely formed from which combination?
Class 10 · Science · Medium
→A salt solution turns blue litmus slightly red. From which type of acid and base may this salt be formed?
Class 10 · Science · Hard
→Why is the conductivity of hydrochloric acid greater than ethanoic acid at the same concentration?
Class 10 · Science · Medium
→A solution gives orange colour with universal indicator and becomes yellow after adding more water. What is the correct conclusion?
Class 10 · Science · Medium
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